DOE OSTI2020
Mo6Fe3PtN2 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are six inequivalent Mo sites. In the first Mo site, Mo is bonded in a distorted bent 150 degrees geometry to five Fe, one Pt, and two equivalent N atoms. There are a spread of Mo–Fe bond distances ranging from 2.67–2.85 Å. The Mo–Pt bond length is 2.82 Å. There are one shorter (2.10 Å) and one longer (2.11 Å) Mo–N bond lengths. In the second Mo site, Mo is bonded in a distorted bent 150 degrees geometry to four Fe, two equivalent Pt, and two equivalent N atoms. There are a spread of Mo–Fe bond distances ranging from 2.69–2.92 Å. There are one shorter (2.79 Å) and one longer (2.81 Å) Mo–Pt bond lengths. There are one shorter (2.10 Å) and one longer (2.11 Å) Mo–N bond lengths. In the third Mo site, Mo is bonded in a distorted bent 150 degrees geometry to five Fe, one Pt, and two N atoms. There are a spread of Mo–Fe bond distances ranging from 2.65–2.83 Å. The Mo–Pt bond length is 2.82 Å. There are one shorter (2.10 Å) and one longer (2.11 Å) Mo–N bond lengths. In the fourth Mo site, Mo is bonded in a distorted bent 150 degrees geometry to four Fe, two equivalent Pt, and two N atoms. There are a spread of Mo–Fe bond distances ranging from 2.76–2.90 Å. There are one shorter (2.81 Å) and one longer (2.87 Å) Mo–Pt bond lengths. There are one shorter (2.09 Å) and one longer (2.11 Å) Mo–N bond lengths. In the fifth Mo site, Mo is bonded in a distorted bent 150 degrees geometry to four Fe, two equivalent Pt, and two N atoms. There are a spread of Mo–Fe bond distances ranging from 2.71–3.04 Å. There are one shorter (2.81 Å) and one longer (2.83 Å) Mo–Pt bond lengths. Both Mo–N bond lengths are 2.10 Å. In the sixth Mo site, Mo is bonded in a distorted bent 150 degrees geometry to five Fe, one Pt, and two N atoms. There are a spread of Mo–Fe bond distances ranging from 2.72–2.80 Å. The Mo–Pt bond length is 2.86 Å. There are one shorter (2.10 Å) and one longer (2.12 Å) Mo–N bond lengths. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded to nine Mo and three Fe atoms to form FeFe3Mo9 cuboctahedra that share corners with four equivalent PtFe3Mo9 cuboctahedra, corners with six FeFe3Mo9 cuboctahedra, edges with three NMo6 octahedra, faces with four FeFe3Mo9 cuboctahedra, faces with four equivalent PtFe3Mo9 cuboctahedra, and faces with four NMo6 octahedra. There are a spread of Fe–Fe bond distances ranging from 2.40–2.44 Å. In the second Fe site, Fe is bonded to nine Mo, two equivalent Fe, and one Pt atom to form distorted FeFe2Mo9Pt cuboctahedra that share corners with five equivalent PtFe3Mo9 cuboctahedra, corners with six FeFe3Mo9 cuboctahedra, edges with three NMo6 octahedra, faces with two equivalent PtFe3Mo9 cuboctahedra, faces with four FeFe3Mo9 cuboctahedra, and faces with four NMo6 octahedra. The Fe–Pt bond length is 2.57 Å. In the third Fe site, Fe is bonded in a 12-coordinate geometry to nine Mo, one Fe, and two equivalent Pt atoms. Both Fe–Pt bond lengths are 2.56 Å. Pt is bonded to nine Mo and three Fe atoms to form distorted PtFe3Mo9 cuboctahedra that share corners with two equivalent PtFe3Mo9 cuboctahedra, corners with nine FeFe3Mo9 cuboctahedra, edges with three NMo6 octahedra, faces with two equivalent PtFe3Mo9 cuboctahedra, faces with six FeFe3Mo9 cuboctahedra, and faces with four NMo6 octahedra. There are two inequivalent N sites. In the first N site, N is bonded to six Mo atoms to form distorted NMo6 octahedra that share corners with six NMo6 octahedra, an edgeedge with one PtFe3Mo9 cuboctahedra, edges with three FeFe3Mo9 cuboctahedra, faces with two equivalent PtFe3Mo9 cuboctahedra, and faces with four FeFe3Mo9 cuboctahedra. The corner-sharing octahedra tilt angles range from 23–27°. In the second N site, N is bonded to six Mo atoms to form distorted NMo6 octahedra that share corners with six NMo6 octahedra, edges with two equivalent PtFe3Mo9 cuboctahedra, edges with three FeFe3Mo9 cuboctahedra, faces with two equivalent PtFe3Mo9 cuboctahedra, and faces with four FeFe3Mo9 cuboctahedra. The corner-sharing octahedra tilt angles range from 23–27°.