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DOE OSTI2020

Materials Data on Ca3Al2S(OF)8 by Materials Project

Ca3Al2S(OF)8 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 8-coordinate geometry to three O and five F atoms. There are a spread of Ca–O bond distances ranging from 2.41–2.79 Å. There are a spread of Ca–F bond distances ranging from 2.32–2.54 Å. In the second Ca site, Ca is bonded in a 4-coordinate geometry to four O and four F atoms. There are two shorter (2.56 Å) and two longer (2.73 Å) Ca–O bond lengths. There are two shorter (2.24 Å) and two longer (2.33 Å) Ca–F bond lengths. Al is bonded to two equivalent O and four F atoms to form edge-sharing AlO2F4 octahedra. There is one shorter (1.87 Å) and one longer (1.88 Å) Al–O bond length. There are a spread of Al–F bond distances ranging from 1.74–1.87 Å. S is bonded in a tetrahedral geometry to four O atoms. There is two shorter (1.48 Å) and two longer (1.52 Å) S–O bond length. There are four inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Ca, two equivalent Al, and one O atom. The O–O bond length is 1.60 Å. In the second O site, O is bonded in a water-like geometry to two Ca atoms. In the third O site, O is bonded in a 3-coordinate geometry to two Ca and one S atom. In the fourth O site, O is bonded in a single-bond geometry to one S atom. There are four inequivalent F sites. In the first F site, F is bonded in a 1-coordinate geometry to two equivalent Ca and one Al atom. In the second F site, F is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca and one Al atom. In the third F site, F is bonded in a bent 150 degrees geometry to one Ca and one Al atom. In the fourth F site, F is bonded in a distorted trigonal planar geometry to two Ca and one Al atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Crystal structure of besifloxacin hydrochloride, C 19 H 22 ClFN 3 O 3 Cl

The crystal structure of besifloxacin hydrochloride has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional theory techniques. Besifloxacin hydrochloride crystallizes in space group P1 (#1) with a = 5.36596(8), b = 10.3234(4), c = 17.9673(14) Å, α = 98.122(5), β = 92.9395(9), γ = 96.1135(3)°, V = 977.483(13) Å 3 , and Z = 2. The crystal structure is approximately centrosymmetric. Strong N–H∙∙∙Cl hydrogen bonds form a corrugated ladder-like chain along the a-axis. The carboxylic acid group in each independent cation acts as the donor in a strong intramolecular O–H∙∙∙O hydrogen bond to an adjacent carbonyl group. The powder pattern has been submitted to ICDD for inclusion in the Powder Diffraction File™ (PDF®).

36 MATERIALS SCIENCE↗
DOE OSTI2022

Modeling Photolytic Decomposition of Energetically Functionalized Dodecanes

The photolytic stability of explosives and energetic functional groups is of importance for those who regularly handle or are exposed to explosives in typical environmental conditions. This study models the photolytic degradation of dodecane substituted with various energetic functional groups: azide, nitro, nitrate ester, and nitramine. For the studied molecules, it was found that excitons localize on the energetic functional group, no matter where they were initially formed, and thus, the predominant degradation pathway involves the degradation of the energetic functional group. The relative trends for both 4 and 8 eV excitation energies followed with what is expected from the relative stability of the energetic functional groups to thermal and sub-shock degradation. The one notable exception was the azide functional group; more work should be done to further understand the photolytic effects on the azide functional group.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on K5Nb(CN)8 by Materials Project

NbK5(CN)8 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional and consists of two columbium molecules and one K5(CN)8 framework. In the K5(CN)8 framework, there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of K–N bond distances ranging from 2.88–3.25 Å. In the second K1+ site, K1+ is bonded in a distorted square co-planar geometry to four equivalent N3- atoms. All K–N bond lengths are 2.86 Å. There are two inequivalent C+1.75+ sites. In the first C+1.75+ site, C+1.75+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C+1.75+ site, C+1.75+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.19 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a distorted single-bond geometry to four equivalent K1+ and one C+1.75+ atom. In the second N3- site, N3- is bonded in a distorted single-bond geometry to three K1+ and one C+1.75+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Step-stool conformation of a cyclic Schiff base derived from ethylenediamine and heptane-2,4,6-trione: evidence for partial hydrolysis in metal coordination

A Schiff base derived from ethylenediamine and heptane-2,4,6-trione, namely, 5,9,14,18-tetramethyl-1,4,10,13-tetraazacyclooctadeca-5,8,14,17-tetraene-7,16- dione (C 18 H 28 N 4 O 2 ), abbreviated H 4 daaden, was prepared and characterized for the first time by single-crystal X-ray diffraction. The atoms of the Schiff base occupy two different planes and thus the molecule is essentially nonplanar. An axis running through the C–C atoms of the ethylenediamine groups separate the two planes and these two planes are connected by bridging ethylene groups showing an angle of 117.34 (8)°. As a result, the side view of the molecule shows a ‘step-stool’ conformation. The nonplanar nature of the Schiff base plays an important role in metal coordination, which leads to partial hydrolysis of the ring structure

crystal structure↗
DOE OSTI2020

Materials Data on SnS8(N2Cl)4 by Materials Project

SnCl4(NS)8 crystallizes in the orthorhombic Pca2_1 space group. The structure is zero-dimensional and consists of eight 1,3,5,7,2,4,6,8-tetrathiatetrazocane molecules and four tin tetrachloride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Centrosymmetric or Noncentrosymmetric? Transition Metals Talking in K 2 TGe 3 S 8 (T = Co, Fe)

Two new quaternary sulfides K 2 TGe 3 S 8 (T=Co, Fe) have been synthesized by a high-temperature solid-state routine and flux growth method. The crystal growth process of K 2 TGe 3 S 8 (T=Co, Fe) was elucidated by in-situ powder X-ray diffraction and DSC thermal analysis. The mm-sized crystals of K 2 TGe 3 S 8 (T=Co, Fe) were grown. K 2 CoGe 3 S 8 crystallizes in a new structure type in centrosymmetric space group P1¯ (No. 2) with unit cell parameters of a = 7.016(1) Å, b = 7.770(1)Å, c = 14.342(1) Å, α = 93.80(1)°, β = 92.65(1)°, γ = 114.04(1)°. K 2 FeGe 3 S 8 crystallizes in K 2 FeGe 3 Se 8 structure type and the noncentrosymmetric space group P2 1 (No. 4) with unit cell parameters of a = 7.1089(5)Å, b = 11.8823(8)Å, c = 16.7588(11)Å, β = 96.604(2)°. There is a high structural similarity between K 2 CoGe 3 S 8 and K 2 FeGe 3 S 8 . The larger volume coupled with higher degrees of distortion of [FeS 4 ] tetrahedra compared to [CoS 4 ] tetrahedra accounts for the structure’s shift from centrosymmetric to noncentrosymmetric. The theory simulation confirms that [TS 4 ]T= Co or Fe tetrahedra play a crucial role in controlling the structure and properties of K 2 TGe 3 S 8 (T = Co, Fe). The measured optical bandgaps of K 2 CoGe 3 S 8 and K 2 FeGe 3 S 8 are 2.1(1) eV and 2.6(1) eV respectively. K 2 FeGe 3 S 8 shows antiferromagnetic ordering at 24K while no magnetic ordering was detected in K 2 CoGe 3 S 8 . In conclusion, the magnetic measurements also demonstrate the divalent nature of transition metals in K 2 TGe 3 S 8 (T = Co, Fe).

36 MATERIALS SCIENCE↗
DOE OSTI2022

Self‐gated, dynamic contrast‐enhanced magnetic resonance imaging with compressed‐sensing reconstruction for evaluating endothelial permeability in the aortic root of atherosclerotic mice

High‐risk atherosclerotic plaques are characterized by active inflammation and abundant leaky microvessels. We present a self‐gated, dynamic contrast‐enhanced magnetic resonance imaging (DCE‐MRI) acquisition with compressed sensing reconstruction and apply it to assess longitudinal changes in endothelial permeability in the aortic root of Apoe −/− atherosclerotic mice during natural disease progression. Twenty‐four, 8‐week‐old, female Apoe −/− mice were divided into four groups (n = 6 each) and imaged with self‐gated DCE‐MRI at 4, 8, 12, and 16 weeks after high‐fat diet initiation, and then euthanized for CD68 immunohistochemistry for macrophages. Eight additional mice were kept on a high‐fat diet and imaged longitudinally at the same time points. Aortic‐root pseudo‐concentration curves were analyzed using a validated piecewise linear model. Contrast agent wash‐in and washout slopes ( b 1 and b 2 ) were measured as surrogates of aortic root endothelial permeability and compared with macrophage density by immunohistochemistry. b 2 , indicating contrast agent washout, was significantly higher in mice kept on an high‐fat diet for longer periods of time ( p = 0.03). Group comparison revealed significant differences between mice on a high‐fat diet for 4 versus 16 weeks ( p = 0.03). Macrophage density also significantly increased with diet duration ( p = 0.009). Spearman correlation between b 2 from DCE‐MRI and macrophage density indicated a weak relationship between the two parameters (r = 0.28, p = 0.20). Validated piecewise linear modeling of the DCE‐MRI data showed that the aortic root contrast agent washout rate is significantly different during disease progression. Further development of this technique from a single‐slice to a 3D acquisition may enable better investigation of the relationship between in vivo imaging of endothelial permeability and atherosclerotic plaques' genetic, molecular, and cellular makeup in this important model of disease.

Calcagno, Claudia↗
DOE OSTI2020

2,4,6–Triphenylpyridinium: A Bulky, Highly Electron–Withdrawing Substituent Which Enhances Properties of Nickel(II) Ethylene Polymerization Catalysts

The reactivity of Ni(II) and Pd(II) olefin polymerization catalysts can be enhanced by introduction of electron-withdrawing substituents on the supporting ligands rendering the metal centers more electrophilic. Reported here is a comparison of ethylene polymerization activity of a classical salicyliminato nickel catalyst substituted with the powerful electron-withdrawing 2,4,6-triphenylpyridinium (trippy) group to its’ –CF3 analog. The trippy substituent is substantially more electron-withdrawing (σmeta = 0.63) than the trifluoromethyl group (σmeta = 0.43) which results in a ca. 8-fold increase in catalytic turnover frequency. An additional advantage of trippy is its’ high steric bulk relative to the trifluoromethyl group. This feature results in a four-fold increase in polymer molecular weight due to enhanced retardation of chain transfer. Here, a significant increase in catalyst lifetime is observed as well.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2022

Multi-group Examination of Nickel-Reflected HEU System [Slides]

Researchers noted an unusually large bias for 8-in. nickel reflected HEU sphere in HMF-003 between the 252- group library and the CE library in SCALE 6.2.4. The bias was investigated by reviewing reactions that $k_{eff}$ is sensitive to using TSUNAMI and collecting reaction rate data using tools within SCALE. For this system, bias is primarily due to the elastic scattering in nickel. Researchers compared new multigroup structures in SCALE 6.3. For this system, reduction in CE-to-MG bias seen in the 302-group and further improved in the 1597-group structure. When researchers compared ENDF/B-VIII.0 in SCALE 6.3, library showed improved results with new nickel evaluation. However, the MG-to-CE bias can still be large as large biases can occur in any system. This example highlights the importance of validating results with measured systems.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2020

Materials Data on FeCu2H21(O5F4)2 by Materials Project

FeCu2H17(OF)8(H2O)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional and consists of two water molecules and one FeCu2H17(OF)8 framework. In the FeCu2H17(OF)8 framework, Fe3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Fe–F bond distances ranging from 1.95–1.97 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to five O2- and one F1- atom. There are a spread of Cu–O bond distances ranging from 1.94–2.71 Å. The Cu–F bond length is 2.05 Å. In the second Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to five O2- and one F1- atom. There are a spread of Cu–O bond distances ranging from 1.95–2.73 Å. The Cu–F bond length is 2.04 Å. There are seventeen inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted linear geometry to one O2- and one F1- atom. The H–O bond length is 1.01 Å. The H–F bond length is 1.56 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the fifth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.61 Å. In the sixth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.60 Å. In the seventh H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.66 Å. In the tenth H1+ site, H1+ is bonded in a linear geometry to two F1- atoms. There is one shorter (1.15 Å) and one longer (1.16 Å) H–F bond length. In the eleventh H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. In the twelfth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.60 Å. In the thirteenth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.60 Å. In the fourteenth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the fifteenth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the sixteenth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the seventeenth H1+ site, H1+ is bonded in a distorted linear geometry to one O2- and one F1- atom. The H–O bond length is 1.01 Å. The H–F bond length is 1.57 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to one Cu2+ and two H1+ atoms. In the second O2- site, O2- is bonded in a distorted water-like geometry to two Cu2+ and two H1+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cu2+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Cu2+ and two H1+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Cu2+ and two H1+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Cu2+ and two H1+ atoms. In the seventh O2- site, O2- is bonded in a distorted water-like geometry to two Cu2+ and two H1+ atoms. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Cu2+ and two H1+ atoms. There are eight inequivalent F1- sites. In the first F1- site, F1- is bonded in a 3-coordinate geometry to one Fe3+ and two H1+ atoms. In the second F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one Fe3+ and one H1+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one Fe3+ and one H1+ atom. In the fourth F1- site, F1- is bonded in a distorted single-bond geometry to one Cu2+ and one H1+ atom. In the fifth F1- site, F1- is bonded in a distorted single-bond geometry to one Cu2+ and one H1+ atom. In the sixth F1- site, F1- is bonded in a distorted single-bond geometry to one Fe3+ atom. In the seventh F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one Fe3+ and one H1+ atom. In the eighth F1- site, F1- is bonded in a 3-coordinate geometry to one Fe3+ and two H1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(AuF6)2 by Materials Project

BaBa3(AuF6)8 crystallizes in the cubic P-43m space group. The structure is three-dimensional and consists of one barium molecule and one Ba3(AuF6)8 framework. In the Ba3(AuF6)8 framework, Ba2+ is bonded to eight F1- atoms to form distorted BaF8 hexagonal bipyramids that share corners with eight AuF6 octahedra. The corner-sharing octahedra tilt angles range from 28–30°. There are four shorter (2.76 Å) and four longer (2.77 Å) Ba–F bond lengths. There are two inequivalent Au5+ sites. In the first Au5+ site, Au5+ is bonded to six F1- atoms to form AuF6 octahedra that share corners with three equivalent BaF8 hexagonal bipyramids. There is three shorter (1.92 Å) and three longer (1.98 Å) Au–F bond length. In the second Au5+ site, Au5+ is bonded to six F1- atoms to form AuF6 octahedra that share corners with three equivalent BaF8 hexagonal bipyramids. There is three shorter (1.92 Å) and three longer (1.98 Å) Au–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Ba2+ and one Au5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Au5+ atom. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Ba2+ and one Au5+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Au5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(AuF6)2 by Materials Project

SrSr3(AuF6)8 crystallizes in the cubic P-43m space group. The structure is three-dimensional and consists of one strontium molecule and one Sr3(AuF6)8 framework. In the Sr3(AuF6)8 framework, Sr2+ is bonded to eight F1- atoms to form distorted SrF8 hexagonal bipyramids that share corners with eight AuF6 octahedra. The corner-sharing octahedra tilt angles range from 27–29°. There are four shorter (2.65 Å) and four longer (2.66 Å) Sr–F bond lengths. There are two inequivalent Au5+ sites. In the first Au5+ site, Au5+ is bonded to six F1- atoms to form AuF6 octahedra that share corners with three equivalent SrF8 hexagonal bipyramids. There is three shorter (1.91 Å) and three longer (1.98 Å) Au–F bond length. In the second Au5+ site, Au5+ is bonded to six F1- atoms to form AuF6 octahedra that share corners with three equivalent SrF8 hexagonal bipyramids. There is three shorter (1.91 Å) and three longer (1.98 Å) Au–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Sr2+ and one Au5+ atom. In the second F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one Sr2+ and one Au5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Au5+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Au5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3CaAl8H24(C2O11)4 by Materials Project

Sr3CaAl8H16(CO5)8(H2O)4 crystallizes in the monoclinic Pm space group. The structure is three-dimensional and consists of four water molecules and one Sr3CaAl8H16(CO5)8 framework. In the Sr3CaAl8H16(CO5)8 framework, there are three inequivalent Sr sites. In the first Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.92 Å. In the second Sr site, Sr is bonded in a 7-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.48–2.92 Å. In the third Sr site, Sr is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.92 Å. Ca is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Ca–O bond distances ranging from 2.44–2.91 Å. There are four inequivalent Al sites. In the first Al site, Al is bonded to six O atoms to form edge-sharing AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.97 Å. In the second Al site, Al is bonded to six O atoms to form edge-sharing AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.96 Å. In the third Al site, Al is bonded to six O atoms to form edge-sharing AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.96 Å. In the fourth Al site, Al is bonded to six O atoms to form edge-sharing AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.85–1.95 Å. There are eight inequivalent C sites. In the first C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.28 Å) and two longer (1.31 Å) C–O bond length. In the second C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.27 Å) and two longer (1.31 Å) C–O bond length. In the third C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.27 Å) and two longer (1.32 Å) C–O bond length. In the fourth C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.27 Å) and two longer (1.31 Å) C–O bond length. In the fifth C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.28 Å) and two longer (1.31 Å) C–O bond length. In the sixth C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.28 Å) and two longer (1.30 Å) C–O bond length. In the seventh C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the eighth C site, C is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.28 Å) and two longer (1.30 Å) C–O bond length. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the third H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the sixth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the ninth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.63 Å) H–O bond length. In the tenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.62 Å) H–O bond length. In the eleventh H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.62 Å) H–O bond length. In the twelfth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.63 Å) H–O bond length. In the thirteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the fourteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the fifteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the sixteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.00 Å. There are thirty-two inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two equivalent Al and one H atom. In the second O site, O is bonded in a distorted trigonal planar geometry to two equivalent Al and one H atom. In the third O site, O is bonded in a distorted trigonal planar geometry to two equivalent Al and one H atom. In the fourth O site, O is bonded in a distorted trigonal planar geometry to two equivalent Al and one H atom. In the fifth O site, O is bonded in a 1-coordinate geometry to one Sr, two equivalent Al, and one H atom. In the sixth O site, O is bonded in a 1-coordinate geometry to one Sr, two equivalent Al, and one H atom. In the seventh O site, O is bonded in a 1-coordinate geometry to one Sr, two equivalent Al, and one H atom. In the eighth O site, O is bonded in a 1-coordinate geometry to one Ca, two equivalent Al, and one H atom. In the ninth O site, O is bonded in a 3-coordinate geometry to one Ca, one Al, and one C atom. In the tenth O site, O is bonded in a 3-coordinate geometry to one Sr, one Al, and one C atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to one Sr, one Al, and one C atom. In the twelfth O site, O is bonded in a 3-coordinate geometry to one Sr, one Al, and one C atom. In the thirteenth O site, O is bonded in a 2-coordinate geometry to one Sr, one Al, and one C atom. In the fourteenth O site, O is bonded in a 2-coordinate geometry to one Sr, one Al, and one C atom. In the fifteenth O site, O is bonded in a 2-coordinate geometry to one Sr, one Al, and one C atom. In the sixteenth O site, O is bonded in a 2-coordinate geometry to one Ca, one Al, and one C atom. In the seventeenth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and two H atoms. In the eighteenth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and two H atoms. In the nineteenth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and two H atoms. In the twentieth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and two H atoms. In the twenty-first O site, O is bonded in a distorted single-bond geometry to one Sr, two equivalent Ca, and one C atom. In the twenty-second O site, O is bonded in a distorted single-bond geometry to three Sr and one C atom. In the twenty-third O site, O is bonded in a distorted single-bond geometry to two equivalent Sr, one Ca, and one C atom. In the twenty-fourth O site, O is bonded in a distorted single-bond geometry to three Sr and one C atom. In the twenty-fifth O site, O is bonded in a distorted bent 120 degrees geometry to one Ca and one C atom. In the twenty-sixth O site, O is bonded in a distorted single-bond geometry to one Sr and one C atom. In the twenty-seventh O site, O is bonded in a distorted single-bond geometry to one Sr and one C atom. In the twenty-eighth O site, O is bonded in a distorted single-bond geometry to one Sr and one C atom. In the twenty-ninth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and one H atom. In the thirtieth O site, O is bonded in a distorted single-bond geometry to two equivalent Al and one H atom. In the thirty-first O site, O is bonded in a distorted single-bond geometry to two equivalent Al and one H atom. In the thirty-second O site, O is bonded in a distorted single-bond geometry to two equivalent Al and one H atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2ZrCdH16(CO3)8 by Materials Project

K2ZrCdH16(CO3)8 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.78 Å) and four longer (2.90 Å) K–O bond lengths. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.87 Å) and four longer (2.92 Å) K–O bond lengths. Zr4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.23 Å) and four longer (2.26 Å) Zr–O bond lengths. Cd2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.40 Å) and four longer (2.53 Å) Cd–O bond lengths. There are two inequivalent C3+ sites. In the first C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.30 Å) C–O bond length. In the second C3+ site, C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cd2+ and one C3+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Zr4+, and one C3+ atom. In the third O2- site, O2- is bonded in a water-like geometry to one K1+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a water-like geometry to one K1+ and two H1+ atoms. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr4+ and one C3+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one K1+, one Cd2+, and one C3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Crystal structure of danofloxacin mesylate (C 19 H 21 FN 3 O 3 )(CH 3 O 3 S)

The crystal structure of danofloxacin mesylate has been solved and refined using synchrotron X-ray powder diffraction data and optimized using density functional theory techniques. Danofloxacin mesylate crystallizes in space group P1 (#1) with a = 6.77474(8), b = 12.4973(4), c = 12.82826(28) Å, α = 84.8709(29), β = 87.7501(10), γ = 74.9916(4)°, V = 1044.723(11) Å 3 , and Z = 2. The protonation of the danofloxacin cations was established by the analysis of potential intermolecular interactions and differs from that expected from isolated-cation calculations. The crystal structure consists of alternating layers of cations and anions parallel to the ac-plane. There is parallel stacking of the oxoquinoline rings along the a-axis. The expected N–H∙∙∙O hydrogen bonds between the cations and anions are not present. Each cation makes an N–H∙∙∙O hydrogen bond with the other cation, resulting in zig-zag chains along the a-axis. Both cations have strong intramolecular O–H∙∙∙O hydrogen bonds. There are several C–H∙∙∙O hydrogen bonds between the danofloxacin cations and mesylate anions. The powder pattern has been submitted to ICDD® for inclusion in the Powder Diffraction File™ (PDF®).

36 MATERIALS SCIENCE↗
DOE OSTI2025

Flux-Assisted Boron Chalcogen Mixture (BCM) Method for Synthesizing Mixed Chalcogenide Semiconductors (AkRE 2 Si 2 Se x S 8– x and CaRE 2 Si 2 Se 8 ) ( Ak = Ca and Sr; RE = La, Ce, Pr, Nd, and Sm): Investigation of Their Magnetic and Optical Properties

We report a detailed structural analysis of a series of ten quaternary rare-earth-containing seleno-thiosilicates AkRE 2 Si 2 Se x S 8-x and selenosilicates, CaRE 2 Si 2 Se 8 (Ak = Ca and Sr; RE = La, Ce, Pr, Nd, and Sm). Single crystals were obtained by using the flux-assisted boron chalcogen mixture (BCM) method and single crystal X-ray diffraction was used to determine their structures. All members of the AkRE 2 Si 2 Se x S 8-x and CaRE 2 Si 2 Se 8 series crystallize in the space group R$\bar{3}$c (space group number 167) of the trigonal crystal system. The single-crystal X-ray diffraction analysis revealed a strong preference for Se/S atoms to occupy one vs. the other of the two available sites. Polycrystalline samples were used for magnetic susceptibility and UV–visible diffuse reflectance measurements. Magnetic measurements show that CaCe₂Si₂Se₁.₇₃S₆.₂₇ and CaNd₂Si₂Se₂.₅S₅.₅ are paramagnetic with negative Weiss constants (θ = –60.1 and –26.2). Diffuse reflectance analysis gives optical band gaps of 2.7(1) eV (CaLa₂Si₂Se₂.₃₈S₅.₆₂), 2.2(1) eV (CaCe₂Si₂Se₁.₇₃S₆.₂₇), 2.5(1) eV (CaNd₂Si₂Se₂.₅S₅.₅), and 2.0(1) eV (CaCe₂Si₂Se₈), consistent with density functional theory calculations. By partially or fully replacing S sites with Se it was possible to achieve band gap tuning. Photoluminescence behavior was also investigated for CaCe 2 Si 2 Se 1.73 S 6.27 via irradiation with 375 nm ultraviolet light.

BCM method↗
DOE OSTI2020

Materials Data on NdH24C4I3(NO)8 by Materials Project

NdC4H24(NO)8(I)3 crystallizes in the monoclinic P2/c space group. The structure is zero-dimensional and consists of six hydriodic acid molecules and two NdC4H24(NO)8 clusters. In each NdC4H24(NO)8 cluster, Nd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Nd–O bond distances ranging from 2.37–2.55 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. There is one shorter (1.35 Å) and one longer (1.36 Å) C–N bond length. The C–O bond length is 1.27 Å. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to two N3- and one O2- atom. Both C–N bond lengths are 1.35 Å. The C–O bond length is 1.27 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded in a distorted trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. In the second N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. In the third N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.01 Å) and one longer (1.02 Å) N–H bond length. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.01 Å. There are twelve inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the tenth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the eleventh H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the twelfth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Nd3+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Nd3+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Nd3+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to one Nd3+ and two H1+ atoms.

36 MATERIALS SCIENCE↗