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At least 109 records · Page 6
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ca(NO5)2 by Materials Project

(CaN2O9)2O2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of two hydrogen peroxide molecules and two CaN2O9 clusters. In each CaN2O9 cluster, Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.36–2.84 Å. There are two inequivalent N sites. In the first N site, N is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.23 Å) and two longer (1.29 Å) N–O bond length. In the second N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.22–1.30 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one N atom. In the second O site, O is bonded in a bent 120 degrees geometry to two O atoms. There is one shorter (1.30 Å) and one longer (1.31 Å) O–O bond length. In the third O site, O is bonded in an L-shaped geometry to one Ca and one O atom. In the fourth O site, O is bonded in an L-shaped geometry to one Ca and one N atom. In the fifth O site, O is bonded in an L-shaped geometry to one Ca and one N atom. In the sixth O site, O is bonded in a water-like geometry to one Ca and one O atom. In the seventh O site, O is bonded in a single-bond geometry to one N atom. In the eighth O site, O is bonded in a distorted bent 150 degrees geometry to two equivalent Ca and one N atom. In the ninth O site, O is bonded in a water-like geometry to one Ca and one N atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(NO5)3 by Materials Project

(PrN3O14)2O2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one hydrogen peroxide molecule and two PrN3O14 clusters. In each PrN3O14 cluster, Pr is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Pr–O bond distances ranging from 2.43–2.98 Å. There are three inequivalent N sites. In the first N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.22–1.31 Å. In the second N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.21–1.31 Å. In the third N site, N is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.22 Å) and two longer (1.30 Å) N–O bond length. There are fourteen inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Pr and one O atom. The O–O bond length is 1.35 Å. In the second O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.26 Å. In the third O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.23 Å. In the fourth O site, O is bonded in an L-shaped geometry to one Pr and one N atom. In the fifth O site, O is bonded in a distorted L-shaped geometry to one Pr and one N atom. In the sixth O site, O is bonded in a single-bond geometry to one N atom. In the seventh O site, O is bonded in a distorted water-like geometry to one Pr and one N atom. In the eighth O site, O is bonded in a distorted water-like geometry to one Pr and one N atom. In the ninth O site, O is bonded in a single-bond geometry to one N atom. In the tenth O site, O is bonded in a distorted water-like geometry to one Pr and one N atom. In the eleventh O site, O is bonded in an L-shaped geometry to one Pr and one N atom. In the twelfth O site, O is bonded in a single-bond geometry to one N atom. In the thirteenth O site, O is bonded in a bent 120 degrees geometry to two O atoms. In the fourteenth O site, O is bonded in a bent 150 degrees geometry to one Pr and one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2H3F2 by Materials Project

Fe2HF2H2 is Tenorite-like structured and crystallizes in the tetragonal P4/n space group. The structure is zero-dimensional and consists of eight hydrogen molecules and four Fe2HF2 clusters. In each Fe2HF2 cluster, Fe+2.50+ is bonded in a single-bond geometry to one F1- atom. The Fe–F bond length is 2.02 Å. H1- is bonded in a linear geometry to two equivalent F1- atoms. Both H–F bond lengths are 1.14 Å. F1- is bonded in a linear geometry to one Fe+2.50+ and one H1- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HI(ClO)4 by Materials Project

O2HO2ICl4 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of two hydrogen peroxide molecules and two ICl4 clusters. In each ICl4 cluster, I is bonded in a square co-planar geometry to four equivalent Cl atoms. There are two shorter (2.48 Å) and two longer (2.49 Å) I–Cl bond lengths. Cl is bonded in a single-bond geometry to one I atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on S7N by Materials Project

NS2(S)5 crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of twenty hydrogen sulfide molecules and four NS2 clusters. In each NS2 cluster, N2- is bonded in a bent 150 degrees geometry to two equivalent S+0.29+ atoms. Both N–S bond lengths are 1.61 Å. S+0.29+ is bonded in a single-bond geometry to one N2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbS6 by Materials Project

NbS4(S)2 crystallizes in the orthorhombic Cmmm space group. The structure is zero-dimensional and consists of four hydrogen sulfide molecules and two NbS4 clusters. In each NbS4 cluster, Nb4+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent S+0.67- atoms. All Nb–S bond lengths are 2.37 Å. S+0.67- is bonded in a distorted single-bond geometry to one Nb4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ag12SI by Materials Project

(Ag)12SI is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is zero-dimensional and consists of one hydriodic acid molecule, one hydrogen sulfide molecule, and three Ag clusters. In each Ag cluster, Ag is bonded in an L-shaped geometry to two equivalent Ag atoms. Both Ag–Ag bond lengths are 2.69 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdCN2 by Materials Project

CdCN2 crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three hydrogen cyanide molecules and three CdN clusters. In each CdN cluster, Cd2+ is bonded in a distorted single-bond geometry to one N3- atom. The Cd–N bond length is 2.13 Å. N3- is bonded in a single-bond geometry to one Cd2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sb2HF13 by Materials Project

Sb2F11HF2 is Tungsten Carbide structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one hydrogen fluoride hydrogen fluoride molecule and one Sb2F11 cluster. In the Sb2F11 cluster, Sb is bonded to six F atoms to form corner-sharing SbF6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are a spread of Sb–F bond distances ranging from 1.89–2.08 Å. There are six inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Sb atom. In the second F site, F is bonded in a single-bond geometry to one Sb atom. In the third F site, F is bonded in a single-bond geometry to one Sb atom. In the fourth F site, F is bonded in a single-bond geometry to one Sb atom. In the fifth F site, F is bonded in a single-bond geometry to one Sb atom. In the sixth F site, F is bonded in a linear geometry to two equivalent Sb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Bottom-up evolution of perovskite clusters into high-activity rhodium nanoparticles toward alkaline hydrogen evolution

Self-reconstruction has been considered an efficient means to prepare efficient electrocatalysts in various energy transformation process for bond activation and breaking. However, developing nano-sized electrocatalysts through complete in-situ reconstruction with improved activity remains challenging. Herein, we report a bottom-up evolution route of electrochemically reducing Cs 3 Rh 2 I 9 halide-perovskite clusters on N-doped carbon to prepare ultrafine Rh nanoparticles (~2.2 nm) with large lattice spacings and grain boundaries. Various in-situ and ex-situ characterizations including electrochemical quartz crystal microbalance experiments elucidate the Cs and I extraction and Rh reduction during the electrochemical reduction. These Rh nanoparticles from Cs 3 Rh 2 I 9 clusters show significantly enhanced mass and area activity toward hydrogen evolution reaction in both alkaline and chlor-alkali electrolyte, superior to liquid-reduced Rh nanoparticles as well as bulk Cs 3 Rh 2 I 9 -derived Rh via top-down electro-reduction transformation. Theoretical calculations demonstrate water activation could be boosted on Cs 3 Rh 2 I 9 clusters-derived Rh nanoparticles enriched with multiply sites, thus smoothing alkaline hydrogen evolution.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2024

Molecular insights into the in situ early-stage assembly of metal–organic frameworks on cellulose nanofibrils

The integration of metal–organic frameworks (MOFs) into renewable matrices, including those derived from cellulose, to create cellulose/MOF hybrids has attracted significant interest due to the synergistic combination of cellulosic biopolymer properties and MOFs' multifunctional features. The interfacial interactions between cellulose and MOF not only ensure stable bonding, but ultimately also determine the bulk physical properties of the macroscopic composites. However, the mechanistic understanding of the in situ assembly between the two materials remains unclear. In this study, we employ a combination study of synthesis, experimental characterization, and molecular dynamics simulations to explore the early-stage assembly of a cellulose/MOF hybrid. Our results revealed that the growth of MOF clusters on the 2,2,6,6-tetramethyl-1-piperidinyloxy oxidized cellulose nanofibrils (TOCNF) follows an inhomogeneous sequential transformation pathway. The carboxylates of TOCNF form coordination-like bonds with the metal ions, while the hydroxyl groups of TOCNF form hydrogen bonds with MOF ligands. These interactions provide the initial nucleation sites that mediate the growth of MOF clusters and also guide the assembly of larger MOF clusters onto the TOCNF substrate. In conclusion, the fundamental insights into the in situ assembly of MOF nanoparticles on cellulosic substrates are essential for the rational design of high-performance materials with tailored morphology and optimized properties.

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

Materials Data on S5N2(O2F)4 by Materials Project

N2S(SO2F)4 is Ammonia-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of eight ammonia molecules, four hydrogen sulfide molecules, and sixteen SO2F clusters. In each SO2F cluster, S+2.80+ is bonded in a trigonal non-coplanar geometry to two O2- and one F1- atom. Both S–O bond lengths are 1.42 Å. The S–F bond length is 1.59 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one S+2.80+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one S+2.80+ atom. F1- is bonded in a single-bond geometry to one S+2.80+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on S4N2O3F by Materials Project

N2(S)3SO3F crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of eight ammonia molecules, twelve hydrogen sulfide molecules, and four SO3F clusters. In each SO3F cluster, S+0.25+ is bonded in a tetrahedral geometry to three O2- and one F1- atom. There is two shorter (1.45 Å) and one longer (1.47 Å) S–O bond length. The S–F bond length is 1.64 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one S+0.25+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one S+0.25+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one S+0.25+ atom. F1- is bonded in a single-bond geometry to one S+0.25+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbH12C4NO13 by Materials Project

NbC2H6O9(CHO)2H2NH2O2 crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of four formaldehyde molecules, two hydrogen molecules, two NH2O2 clusters, and two NbC2H6O9 clusters. In each NH2O2 cluster, N3- is bonded in a water-like geometry to two O2- atoms. There is one shorter (1.13 Å) and one longer (2.00 Å) N–O bond length. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to one N3- and two equivalent H1+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one N3- atom. In each NbC2H6O9 cluster, Nb5+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Nb–O bond distances ranging from 1.89–2.06 Å. C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.32 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 0.98 Å. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.10 Å) and one longer (1.39 Å) H–O bond length. In the third 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 fourth H1+ site, H1+ is bonded in a bent 150 degrees geometry to two equivalent O2- atoms. Both H–O bond lengths are 1.23 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Nb5+ and two H1+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one C3+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one C3+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Nb5+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Nb5+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V2As3N2O17 by Materials Project

V2As3O13N2(O2)2 crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of eight ammonia molecules, eight hydrogen peroxide molecules, and two V2As3O13 clusters. In each V2As3O13 cluster, V+4.50+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of V–O bond distances ranging from 1.60–2.43 Å. There are three inequivalent As5+ sites. In the first As5+ site, As5+ is bonded in a distorted trigonal pyramidal geometry to four O2- atoms. There are a spread of As–O bond distances ranging from 1.70–1.97 Å. In the second As5+ site, As5+ is bonded in a water-like geometry to two equivalent O2- atoms. Both As–O bond lengths are 1.72 Å. In the third As5+ site, As5+ is bonded in a distorted tetrahedral geometry to four O2- atoms. There are a spread of As–O bond distances ranging from 1.63–2.24 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one As5+ and one O2- atom. The O–O bond length is 1.32 Å. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent V+4.50+ and one As5+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent V+4.50+ atoms. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one V+4.50+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one V+4.50+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one V+4.50+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one V+4.50+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one As5+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one As5+ and one O2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Re3Se4O9 by Materials Project

Re3Se4O3(O2)3 crystallizes in the trigonal R-3m space group. The structure is zero-dimensional and consists of eighteen hydrogen peroxide molecules and three Re3Se4O3 clusters. In each Re3Se4O3 cluster, Re+6.67+ is bonded in a distorted single-bond geometry to four Se+0.50- and one O2- atom. There are a spread of Re–Se bond distances ranging from 2.52–2.54 Å. The Re–O bond length is 1.70 Å. There are two inequivalent Se+0.50- sites. In the first Se+0.50- site, Se+0.50- is bonded in a 3-coordinate geometry to three equivalent Re+6.67+ atoms. In the second Se+0.50- site, Se+0.50- is bonded in a 3-coordinate geometry to three equivalent Re+6.67+ atoms. O2- is bonded in a single-bond geometry to one Re+6.67+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Structural evidence for intermediates during O 2 formation in photosystem II

In natural photosynthesis, the light-driven splitting of water into electrons, protons and molecular oxygen forms the first step of the solar-to-chemical energy conversion process. The reaction takes place in photosystem II, where the Mn 4 CaO 5 cluster first stores four oxidizing equivalents, the S 0 to S 4 intermediate states in the Kok cycle, sequentially generated by photochemical charge separations in the reaction center and then catalyzes the O–O bond formation chemistry. Here, we report room temperature snapshots by serial femtosecond X-ray crystallography to provide structural insights into the final reaction step of Kok’s photosynthetic water oxidation cycle, the S 3 →[S 4 ]→S 0 transition where O 2 is formed and Kok’s water oxidation clock is reset. Our data reveal a complex sequence of events, which occur over micro- to milliseconds, comprising changes at the Mn 4 CaO 5 cluster, its ligands and water pathways as well as controlled proton release through the hydrogen-bonding network of the Cl1 channel. Importantly, the extra O atom O x , which was introduced as a bridging ligand between Ca and Mn1 during the S 2 →S 3 transition disappears or relocates in parallel with Y z reduction starting at approximately 700 μs after the third flash. The onset of O 2 evolution, as indicated by the shortening of the Mn1–Mn4 distance, occurs at around 1,200 μs, signifying the presence of a reduced intermediate, possibly a bound peroxide.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2020

Materials Data on TiH12N3F7 by Materials Project

(NH4)3TiF7 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one ammonia molecule, one hydrofluoric acid molecule, two hydrogen molecules, one monofluoroamine molecule, and one TiNH3F5 cluster. In the TiNH3F5 cluster, Ti4+ is bonded in a tetrahedral geometry to one N3- and three F1- atoms. The Ti–N bond length is 1.69 Å. There are a spread of Ti–F bond distances ranging from 1.85–1.96 Å. N3- is bonded in a bent 150 degrees geometry to one Ti4+ and one H1+ atom. The N–H bond length is 1.02 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted linear geometry to two F1- atoms. There is one shorter (0.97 Å) and one longer (1.55 Å) H–F bond length. 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 linear geometry to two F1- atoms. There is one shorter (0.98 Å) and one longer (1.47 Å) H–F bond length. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Ti4+ atom. In the second F1- site, F1- is bonded in a distorted single-bond geometry to one H1+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one H1+ atom. In the fourth F1- site, F1- is bonded in a 3-coordinate geometry to one Ti4+ and two H1+ atoms. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Ti4+ atom.

36 MATERIALS SCIENCE↗