Ag3SI crystallizes in the monoclinic Pm space group. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. In the third Ag site, Ag(3) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. S(1) is bonded to two equivalent Ag(1), two equivalent Ag(2), and two equivalent Ag(3) atoms to form distorted corner-sharing SAg6 pentagonal pyramids. I(1) is bonded in a 6-coordinate geometry to two equivalent Ag(1), two equivalent Ag(2), and two equivalent Ag(3) atoms.
Ag3SI crystallizes in the monoclinic Pm space group. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. There is one shorter (2.52 Å) and one longer (2.61 Å) Ag(1)-S(1) bond length. Both Ag(1)-I(1) bond lengths are 3.12 Å. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. Both Ag(2)-S(1) bond lengths are 2.55 Å. There is one shorter (3.01 Å) and one longer (3.21 Å) Ag(2)-I(1) bond length. In the third Ag site, Ag(3) is bonded in a 4-coordinate geometry to two equivalent S(1) and two equivalent I(1) atoms. There is one shorter (2.58 Å) and one longer (2.60 Å) Ag(3)-S(1) bond length. Both Ag(3)-I(1) bond lengths are 3.15 Å. S(1) is bonded to two equivalent Ag(1), two equivalent Ag(2), and two equivalent Ag(3) atoms to form distorted corner-sharing SAg6 pentagonal pyramids. I(1) is bonded in a 6-coordinate geometry to two equivalent Ag(1), two equivalent Ag(2), and two equivalent Ag(3) atoms.