La3AgSnSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 9-coordinate geometry to one Ag(1), one Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. Ag(1) is bonded in a trigonal planar geometry to three equivalent La(1) and three equivalent Se(2) atoms. Sn(1) is bonded in a tetrahedral geometry to one Se(1) and three equivalent Se(3) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to three equivalent La(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Ag(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Sn(1) atom.
La3AgSnSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 9-coordinate geometry to one Ag(1), one Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. The La(1)-Ag(1) bond length is 3.44 Å. The La(1)-Se(1) bond length is 3.19 Å. There are a spread of La(1)-Se(3) bond distances ranging from 3.08-3.29 Å. There are a spread of La(1)-Se(2) bond distances ranging from 3.06-3.42 Å. Ag(1) is bonded in a trigonal planar geometry to three equivalent La(1) and three equivalent Se(2) atoms. All Ag(1)-Se(2) bond lengths are 2.59 Å. Sn(1) is bonded in a tetrahedral geometry to one Se(1) and three equivalent Se(3) atoms. The Sn(1)-Se(1) bond length is 2.52 Å. All Sn(1)-Se(3) bond lengths are 2.58 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to three equivalent La(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Ag(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Sn(1) atom.