PmS2 crystallizes in the monoclinic P2_1/c space group. Pm(1) is bonded in a 9-coordinate geometry to four equivalent S(1) and five equivalent S(2) atoms. There are two inequivalent S sites. In the first S site, S(2) is bonded to five equivalent Pm(1) atoms to form a mixture of distorted edge and corner-sharing SPm5 trigonal bipyramids. In the second S site, S(1) is bonded in a 5-coordinate geometry to four equivalent Pm(1) and one S(1) atom.
PmS2 crystallizes in the monoclinic P2_1/c space group. Pm(1) is bonded in a 9-coordinate geometry to four equivalent S(1) and five equivalent S(2) atoms. There are a spread of Pm(1)-S(1) bond distances ranging from 2.84-3.14 Å. There are a spread of Pm(1)-S(2) bond distances ranging from 2.83-3.10 Å. There are two inequivalent S sites. In the first S site, S(2) is bonded to five equivalent Pm(1) atoms to form a mixture of distorted edge and corner-sharing SPm5 trigonal bipyramids. In the second S site, S(1) is bonded in a 5-coordinate geometry to four equivalent Pm(1) and one S(1) atom. The S(1)-S(1) bond length is 2.13 Å.