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All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

High methylation potential of mercury complexed with mixed thiolate ligands by Geobacter sulfurreducens PCA

We report some thiols, such as cysteine (CYS) at moderate concentrations (10–500 µM), can enhance methylmercury (MeHg) formation by Geobacter sulfurreducens PCA, whereas others such as dithiol 2,3-dimercaptopropanesulfonate (DMPS) and 2,3-dimercaptosuccinic acid (DMSA) abolish mercury [Hg(II)] methylation. Little is known, however, about whether Hg(II) methylation could be enhanced or inhibited by the presence of mixed thiol ligands at low concentrations observed in the environment. Surprisingly we found that mixing CYS (1 µM) with DMPS (0.025–0.5 µM) or DMSA (0.025–1 µM) substantially increased MeHg production by 1.5–3.5-fold, compared to the no-thiol control, whereas complexation with a single DMPS, or DMSA, or CYS (1 µM) strongly inhibited Hg(II) methylation. Pre-equilibration between Hg(II) and thiols before the addition of cells was necessary to observe enhanced methylation. Spectroscopic analyses indicated the formation of mixed or heteroleptic coordinated Hg(II)-S 3 /S 4 complexes, which likely facilitated exchange of Hg(II) with cells and its uptake and internal transfer to the HgcAB proteins required for methylation. These results suggest that the effects of thiols on Hg(II) methylation were more complex than previously thought (using a single thiol) and thus underscore the importance of understanding how mixed thiols and their interactions with Hg(II) may ultimately influence MeHg production in the natural environment.

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

Materials Data on Hg2ClO by Materials Project

Hg2OCl crystallizes in the triclinic P1 space group. The structure is one-dimensional and consists of one Hg2OCl ribbon oriented in the (1, 2, 1) direction. there are eight inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a distorted L-shaped geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.56 Å. The Hg–Cl bond length is 2.48 Å. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a distorted L-shaped geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.54 Å. The Hg–Cl bond length is 2.47 Å. In the third Hg+1.50+ site, Hg+1.50+ is bonded in a distorted linear geometry to two O2- atoms. There are one shorter (2.05 Å) and one longer (2.06 Å) Hg–O bond lengths. In the fourth Hg+1.50+ site, Hg+1.50+ is bonded in a distorted linear geometry to two O2- atoms. There are one shorter (2.05 Å) and one longer (2.06 Å) Hg–O bond lengths. In the fifth Hg+1.50+ site, Hg+1.50+ is bonded in a linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.04 Å. In the sixth Hg+1.50+ site, Hg+1.50+ is bonded in a distorted L-shaped geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.55 Å. The Hg–Cl bond length is 2.48 Å. In the seventh Hg+1.50+ site, Hg+1.50+ is bonded in a distorted L-shaped geometry to one O2- and one Cl1- atom. The Hg–O bond length is 2.53 Å. The Hg–Cl bond length is 2.47 Å. In the eighth Hg+1.50+ site, Hg+1.50+ is bonded in a linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.04 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Hg+1.50+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to three Hg+1.50+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Hg+1.50+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Hg+1.50+ atoms. There are four inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Hg+1.50+ atom. In the second Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Hg+1.50+ atom. In the third Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Hg+1.50+ atom. In the fourth Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Hg+1.50+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Re2(HgO2)5 by Materials Project

Re2(HgO2)5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Re5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.75 Å) and two longer (1.76 Å) Re–O bond length. There are three inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.25–2.84 Å. In the second Hg2+ site, Hg2+ is bonded in a 1-coordinate geometry to one O2- atom. The Hg–O bond length is 2.21 Å. In the third Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.09–3.01 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Re5+ atom. In the second O2- site, O2- is bonded to four Hg2+ atoms to form a mixture of distorted edge and corner-sharing OHg4 tetrahedra. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Re5+ and two Hg2+ atoms. In the fourth O2- site, O2- is bonded in a single-bond geometry to one Re5+ and one Hg2+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Re5+ and one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ReHg2O5 by Materials Project

ReHg2O5 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Re6+ sites. In the first Re6+ site, Re6+ is bonded to four O2- atoms to form ReO4 tetrahedra that share corners with two HgO6 octahedra. The corner-sharing octahedra tilt angles range from 18–55°. There are a spread of Re–O bond distances ranging from 1.74–1.77 Å. In the second Re6+ site, Re6+ is bonded to four O2- atoms to form ReO4 tetrahedra that share corners with two HgO6 octahedra. The corner-sharing octahedra tilt angles range from 22–63°. There are a spread of Re–O bond distances ranging from 1.75–1.77 Å. There are five inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to one Hg2+ and four O2- atoms. The Hg–Hg bond length is 2.61 Å. There are a spread of Hg–O bond distances ranging from 2.22–2.99 Å. In the second Hg2+ site, Hg2+ is bonded in a 1-coordinate geometry to one Hg2+ and one O2- atom. The Hg–O bond length is 2.19 Å. In the third Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to five O2- atoms. There are a spread of Hg–O bond distances ranging from 2.08–2.99 Å. In the fourth Hg2+ site, Hg2+ is bonded to six O2- atoms to form distorted HgO6 octahedra that share corners with four ReO4 tetrahedra. There are a spread of Hg–O bond distances ranging from 2.09–2.83 Å. In the fifth Hg2+ site, Hg2+ is bonded to six O2- atoms to form distorted HgO6 octahedra that share corners with four ReO4 tetrahedra. There are a spread of Hg–O bond distances ranging from 2.11–2.74 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and two Hg2+ atoms. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to three Hg2+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and one Hg2+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three Hg2+ atoms. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and two Hg2+ atoms. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and two Hg2+ atoms. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and one Hg2+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one Re6+ and one Hg2+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to one Re6+ and one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgC4NCl3 by Materials Project

C(HgCl2)2C2NC4NClCCl crystallizes in the monoclinic P2_1 space group. The structure is one-dimensional and consists of two ch3nc molecules; two chloromethane molecules; two methane molecules; two C4NCl clusters; and two HgCl2 ribbons oriented in the (1, 0, 0) direction. In each C4NCl cluster, there are four inequivalent C1+ sites. In the first C1+ site, C1+ is bonded in a single-bond geometry to one C1+ and one N3- atom. The C–C bond length is 1.31 Å. The C–N bond length is 1.28 Å. In the second C1+ site, C1+ is bonded in a linear geometry to two C1+ atoms. The C–C bond length is 1.25 Å. In the third C1+ site, C1+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.21 Å. In the fourth C1+ site, C1+ is bonded in a distorted single-bond geometry to one C1+ and one Cl1- atom. The C–Cl bond length is 1.61 Å. N3- is bonded in a linear geometry to two C1+ atoms. Cl1- is bonded in a single-bond geometry to one C1+ atom. In each HgCl2 ribbon, there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a distorted linear geometry to two Cl1- atoms. Both Hg–Cl bond lengths are 2.31 Å. In the second Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to four Cl1- atoms. There are a spread of Hg–Cl bond distances ranging from 2.30–3.45 Å. There are four inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Hg2+ atom. In the second Cl1- site, Cl1- is bonded in a distorted bent 120 degrees geometry to two Hg2+ atoms. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to two Hg2+ atoms. In the fourth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hg2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

High-Performance, Long-Life, Rechargeable Li–CO 2 Batteries based on a 3D Holey Graphene Cathode Implanted with Single Iron Atoms

A highly efficient cathode catalyst for rechargeable Li-CO 2 batteries is successfully synthesized by implanting single iron atoms into 3D porous carbon architectures, consisting of interconnected N,S-codoped holey graphene (HG) sheets. The unique porous 3D hierarchical architecture of the catalyst with a large surface area and sufficient space within the interconnected HG framework can not only facilitate electron transport and CO 2 /Li+ diffusion, but also allow for a high uptake of Li 2 CO 3 to ensure a high capacity. Consequently, the resultant rechargeable Li-CO 2 batteries exhibit a low potential gap of approximate to 1.17 V at 100 mA g -1 and can be repeatedly charged and discharged for over 200 cycles with a cut-off capacity of 1000 mAh g -1 at a high current density of 1 A g -1 . Density functional theory calculations are performed and the observed appealing catalytic performance is correlated with the hierarchical structure of the carbon catalyst. This work provides an effective approach to the development of highly efficient cathode catalysts for metal-CO 2 batteries and beyond.

(2) batteries↗
DOE OSTI2020

Materials Data on Sr(SnHg)2 by Materials Project

Sr(HgSn)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Sr is bonded in a 12-coordinate geometry to seven Hg and seven Sn atoms. There are a spread of Sr–Hg bond distances ranging from 3.50–3.92 Å. There are a spread of Sr–Sn bond distances ranging from 3.58–3.79 Å. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 8-coordinate geometry to four equivalent Sr and four Sn atoms. There are a spread of Hg–Sn bond distances ranging from 2.92–3.21 Å. In the second Hg site, Hg is bonded in a 7-coordinate geometry to three equivalent Sr and four Sn atoms. There are a spread of Hg–Sn bond distances ranging from 2.91–3.26 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 8-coordinate geometry to three equivalent Sr, four Hg, and one Sn atom. The Sn–Sn bond length is 2.92 Å. In the second Sn site, Sn is bonded in a 9-coordinate geometry to four equivalent Sr, four Hg, and one Sn atom. The Sn–Sn bond length is 2.95 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ag2Hg7(As2I3)2 by Materials Project

Ag2Hg7(As2I3)2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Ag1+ is bonded in a trigonal planar geometry to three equivalent I1- atoms. All Ag–I bond lengths are 2.75 Å. There are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a linear geometry to two equivalent As+2.50- atoms. Both Hg–As bond lengths are 2.58 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two As+2.50- and four equivalent I1- atoms. There are one shorter (2.59 Å) and one longer (2.61 Å) Hg–As bond lengths. There are a spread of Hg–I bond distances ranging from 3.29–3.82 Å. There are two inequivalent As+2.50- sites. In the first As+2.50- site, As+2.50- is bonded to three equivalent Hg2+ and one As+2.50- atom to form corner-sharing AsHg3As tetrahedra. The As–As bond length is 2.46 Å. In the second As+2.50- site, As+2.50- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. I1- is bonded in a 1-coordinate geometry to one Ag1+ and four equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdHg4(AsI2)2 by Materials Project

(Hg2As)2(CdI4) crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to two As3- and three I1- atoms to form HgAs2I3 trigonal bipyramids that share corners with three equivalent CdI4 tetrahedra, corners with two equivalent HgAs2I3 trigonal bipyramids, and an edgeedge with one HgAs2I3 trigonal bipyramid. Both Hg–As bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.48–3.54 Å. In the second Hg2+ site, Hg2+ is bonded in a distorted rectangular see-saw-like geometry to two As3- and two I1- atoms. There are one shorter (2.57 Å) and one longer (2.58 Å) Hg–As bond lengths. There are one shorter (3.39 Å) and one longer (3.63 Å) Hg–I bond lengths. In the third Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two As3- and four I1- atoms. There are one shorter (2.57 Å) and one longer (2.58 Å) Hg–As bond lengths. There are a spread of Hg–I bond distances ranging from 3.58–3.86 Å. In the fourth Hg2+ site, Hg2+ is bonded to two As3- and three I1- atoms to form distorted HgAs2I3 trigonal bipyramids that share corners with three equivalent CdI4 tetrahedra, corners with two equivalent HgAs2I3 trigonal bipyramids, and an edgeedge with one HgAs2I3 trigonal bipyramid. Both Hg–As bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.44–3.87 Å. Cd2+ is bonded to four I1- atoms to form CdI4 tetrahedra that share corners with six HgAs2I3 trigonal bipyramids. There are a spread of Cd–I bond distances ranging from 2.81–2.87 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. In the second As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the second I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the third I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the fourth I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgTeO3 by Materials Project

HgTeO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Hg–O bond distances ranging from 2.22–2.51 Å. In the second Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.12–2.87 Å. There are two inequivalent Te4+ sites. In the first Te4+ site, Te4+ is bonded in a 6-coordinate geometry to four O2- atoms. There are a spread of Te–O bond distances ranging from 1.90–2.80 Å. In the second Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Te–O bond distances ranging from 1.91–2.45 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Hg2+ and one Te4+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Hg2+ and one Te4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Hg2+ and one Te4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Hg2+ and two Te4+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Hg2+ and one Te4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Hg2+ and two equivalent Te4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(InHg)2 by Materials Project

Sr(HgIn)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Hg atoms. All Sr–Hg bond lengths are 3.57 Å. Hg is bonded in a 9-coordinate geometry to four equivalent Sr, one Hg, and four equivalent In atoms. The Hg–Hg bond length is 2.85 Å. All Hg–In bond lengths are 3.00 Å. In is bonded to four equivalent Hg atoms to form a mixture of distorted edge and corner-sharing InHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg4Se4O9 by Materials Project

(HgSeO3)3HgSe crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Hg–O bond distances ranging from 2.25–2.85 Å. In the second Hg2+ site, Hg2+ is bonded in a 1-coordinate geometry to one Se+2.50+ and four O2- atoms. The Hg–Se bond length is 2.52 Å. There are a spread of Hg–O bond distances ranging from 2.15–2.91 Å. In the third Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.30–2.58 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 1-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.20–2.81 Å. There are four inequivalent Se+2.50+ sites. In the first Se+2.50+ site, Se+2.50+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.70–1.77 Å. In the second Se+2.50+ site, Se+2.50+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.71–1.79 Å. In the third Se+2.50+ site, Se+2.50+ is bonded in a 2-coordinate geometry to one Hg2+ atom. In the fourth Se+2.50+ site, Se+2.50+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.72 Å) and two longer (1.74 Å) Se–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Hg2+ and one Se+2.50+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Hg2+ and one Se+2.50+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Hg2+ and one Se+2.50+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two Hg2+ and one Se+2.50+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Hg2+ and one Se+2.50+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two Hg2+ and one Se+2.50+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to two Hg2+ and one Se+2.50+ atom. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Hg2+ and one Se+2.50+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Hg2+ and one Se+2.50+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaHg2(ClO)2 by Materials Project

BaHg2(OCl)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Ba2+ is bonded in a 9-coordinate geometry to four equivalent O2- and five Cl1- atoms. All Ba–O bond lengths are 2.80 Å. There are a spread of Ba–Cl bond distances ranging from 3.20–3.77 Å. Hg2+ is bonded in a distorted linear geometry to two equivalent O2- and four Cl1- atoms. There are one shorter (2.10 Å) and one longer (2.11 Å) Hg–O bond lengths. There are two shorter (3.10 Å) and two longer (3.17 Å) Hg–Cl bond lengths. O2- is bonded to two equivalent Ba2+ and two equivalent Hg2+ atoms to form a mixture of distorted edge and corner-sharing OBa2Hg2 tetrahedra. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted square co-planar geometry to four equivalent Ba2+ atoms. In the second Cl1- site, Cl1- is bonded in a 5-coordinate geometry to three equivalent Ba2+ and four equivalent Hg2+ atoms. In the third Cl1- site, Cl1- is bonded in a body-centered cubic geometry to eight equivalent Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3SeO6 by Materials Project

Hg3SeO6 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are nine inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.07–2.87 Å. In the second Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Hg–O bond distances ranging from 2.25–2.69 Å. In the third Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.14–2.62 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to five O2- atoms. There are a spread of Hg–O bond distances ranging from 2.15–2.89 Å. In the fifth Hg2+ site, Hg2+ is bonded in a distorted octahedral geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.30–2.60 Å. In the sixth Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.18–2.63 Å. In the seventh Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.19–2.87 Å. In the eighth Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Hg–O bond distances ranging from 2.29–2.43 Å. In the ninth Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.21–2.92 Å. There are three inequivalent Se6+ sites. In the first Se6+ site, Se6+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.69–1.88 Å. In the second Se6+ site, Se6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Se–O bond distances ranging from 1.66–1.69 Å. In the third Se6+ site, Se6+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There is two shorter (1.70 Å) and one longer (1.91 Å) Se–O bond length. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Hg2+ and one Se6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Hg2+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Hg2+ and one Se6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. In the fifth O2- site, O2- is bonded to four Hg2+ atoms to form a mixture of corner and edge-sharing OHg4 tetrahedra. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two Hg2+ and one Se6+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Hg2+ and one Se6+ atom. In the eighth O2- site, O2- is bonded to four Hg2+ atoms to form distorted corner-sharing OHg4 tetrahedra. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Hg2+ and one Se6+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to three Hg2+ and one Se6+ atom. In the eleventh O2- site, O2- is bonded in a distorted water-like geometry to two Se6+ atoms. In the twelfth O2- site, O2- is bonded to four Hg2+ atoms to form corner-sharing OHg4 trigonal pyramids. In the thirteenth O2- site, O2- is bonded to four Hg2+ atoms to form a mixture of corner and edge-sharing OHg4 tetrahedra. In the fourteenth O2- site, O2- is bonded in a 1-coordinate geometry to three Hg2+ and one Se6+ atom. In the fifteenth O2- site, O2- is bonded in a distorted T-shaped geometry to two Hg2+ and one O2- atom. The O–O bond length is 1.36 Å. In the sixteenth O2- site, O2- is bonded in a distorted L-shaped geometry to one Hg2+ and one O2- atom. The O–O bond length is 1.42 Å. In the seventeenth O2- site, O2- is bonded in a 3-coordinate geometry to one Hg2+ and two O2- atoms. In the eighteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Hg2+ and one Se6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2023

The Marginal Ice Zone as a dominant source region of atmospheric mercury during central Arctic summertime

Atmospheric gaseous elemental mercury (GEM) concentrations in the Arctic exhibit a clear summertime maximum, while the origin of this peak is still a matter of debate in the community. Based on summertime observations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition and a modeling approach, we further investigate the sources of atmospheric Hg in the central Arctic. Simulations with a generalized additive model (GAM) show that long-range transport of anthropogenic and terrestrial Hg from lower latitudes is a minor contribution (~2%), and more than 50% of the explained GEM variability is caused by oceanic evasion. A potential source contribution function (PSCF) analysis further shows that oceanic evasion is not significant throughout the ice-covered central Arctic Ocean but mainly occurs in the Marginal Ice Zone (MIZ) due to the specific environmental conditions in that region. Our results suggest that this regional process could be the leading contributor to the observed summertime GEM maximum. In the context of rapid Arctic warming and the observed increase in width of the MIZ, oceanic Hg evasion may become more significant and strengthen the role of the central Arctic Ocean as a summertime source of atmospheric Hg.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on VAgHgO4 by Materials Project

VAgHgO4 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. V5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of V–O bond distances ranging from 1.71–1.85 Å. Ag1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ag–O bond distances ranging from 2.33–3.04 Å. There are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.28–2.64 Å. In the second Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.06–2.92 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one V5+, one Ag1+, and one Hg2+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one V5+, two equivalent Ag1+, and one Hg2+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one V5+, two equivalent Ag1+, and two Hg2+ atoms. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one V5+, one Ag1+, and two Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3PO4 by Materials Project

Hg3PO4 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two Hg3PO4 sheets oriented in the (0, 0, 1) direction. there are three inequivalent Hg1+ sites. In the first Hg1+ site, Hg1+ is bonded in a 4-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.24–2.69 Å. In the second Hg1+ site, Hg1+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.23–2.76 Å. In the third Hg1+ site, Hg1+ is bonded in a 2-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.22–2.87 Å. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.56 Å) and one longer (1.58 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Hg1+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three Hg1+ and one P5+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two Hg1+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two Hg1+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg7(P2Br3)2 by Materials Project

Hg7(P2Br3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Hg+1.43+ sites. In the first Hg+1.43+ site, Hg+1.43+ is bonded in a distorted square co-planar geometry to two equivalent P1- and two equivalent Br1- atoms. Both Hg–P bond lengths are 2.49 Å. Both Hg–Br bond lengths are 3.36 Å. In the second Hg+1.43+ site, Hg+1.43+ is bonded to two P1- and four Br1- atoms to form distorted HgP2Br4 pentagonal pyramids that share corners with two equivalent HgP2Br4 pentagonal pyramids, corners with two PHg3P tetrahedra, and an edgeedge with one HgP2Br4 pentagonal pyramid. There are one shorter (2.50 Å) and one longer (2.51 Å) Hg–P bond lengths. There are a spread of Hg–Br bond distances ranging from 3.18–3.40 Å. In the third Hg+1.43+ site, Hg+1.43+ is bonded in a 5-coordinate geometry to two equivalent P1- and three Br1- atoms. There are one shorter (2.47 Å) and one longer (2.48 Å) Hg–P bond lengths. There are a spread of Hg–Br bond distances ranging from 2.99–3.32 Å. In the fourth Hg+1.43+ site, Hg+1.43+ is bonded in a 4-coordinate geometry to one P1- and four Br1- atoms. The Hg–P bond length is 2.48 Å. There are a spread of Hg–Br bond distances ranging from 2.63–3.63 Å. There are two inequivalent P1- sites. In the first P1- site, P1- is bonded to three Hg+1.43+ and one P1- atom to form PHg3P tetrahedra that share a cornercorner with one HgP2Br4 pentagonal pyramid and corners with two PHg3P tetrahedra. The P–P bond length is 2.21 Å. In the second P1- site, P1- is bonded to three Hg+1.43+ and one P1- atom to form PHg3P tetrahedra that share a cornercorner with one HgP2Br4 pentagonal pyramid and corners with three PHg3P tetrahedra. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to four Hg+1.43+ atoms. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to five Hg+1.43+ atoms. In the third Br1- site, Br1- is bonded in a distorted water-like geometry to three Hg+1.43+ atoms.

36 MATERIALS SCIENCE↗