Materials Data on Sn2Mo15Se19 by Materials Project
Mo15Sn2Se19 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. there are three inequivalent Mo+2.27+ sites. In the first Mo+2.27+ site, Mo+2.27+ is bonded in a see-saw-like geometry to four Se2- atoms. There are two shorter (2.58 Å) and two longer (2.61 Å) Mo–Se bond lengths. In the second Mo+2.27+ site, Mo+2.27+ is bonded to five Se2- atoms to form a mixture of corner and edge-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.58–2.66 Å. In the third Mo+2.27+ site, Mo+2.27+ is bonded to five Se2- atoms to form a mixture of corner and edge-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.56–2.75 Å. Sn2+ is bonded in a 3-coordinate geometry to three equivalent Se2- atoms. All Sn–Se bond lengths are 3.11 Å. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 7-coordinate geometry to three equivalent Mo+2.27+ atoms. In the second Se2- site, Se2- is bonded in a 4-coordinate geometry to four Mo+2.27+ atoms. In the third Se2- site, Se2- is bonded in a 7-coordinate geometry to three equivalent Mo+2.27+ atoms. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to four Mo+2.27+ and one Sn2+ atom. In the fifth Se2- site, Se2- is bonded in a 4-coordinate geometry to four Mo+2.27+ atoms.