YSI crystallizes in the hexagonal P-6m2 space group. Y(1) is bonded in a trigonal planar geometry to three equivalent S(1) and six equivalent I(1) atoms. S(1) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. I(1) is bonded to six equivalent Y(1) atoms to form a mixture of distorted edge, corner, and face-sharing IY6 pentagonal pyramids.
YSI crystallizes in the hexagonal P-6m2 space group. Y(1) is bonded in a trigonal planar geometry to three equivalent S(1) and six equivalent I(1) atoms. All Y(1)-S(1) bond lengths are 2.62 Å. All Y(1)-I(1) bond lengths are 3.67 Å. S(1) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. I(1) is bonded to six equivalent Y(1) atoms to form a mixture of distorted edge, corner, and face-sharing IY6 pentagonal pyramids.