SrCu2PbS4 crystallizes in the trigonal P3_221 space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. Cu(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form distorted CuS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra and corners with four equivalent Pb(1)S4 tetrahedra. Pb(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form PbS4 tetrahedra that share corners with eight equivalent Cu(1)S4 tetrahedra. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent Cu(1), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing SSr2Cu2Pb trigonal bipyramids. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Pb(1) atom.
SrCu2PbS4 crystallizes in the trigonal P3_221 space group. Sr(1) is bonded in a 8-coordinate geometry to four equivalent S(1) and four equivalent S(2) atoms. There are two shorter (3.10 Å) and two longer (3.27 Å) Sr(1)-S(1) bond lengths. There are two shorter (3.15 Å) and two longer (3.42 Å) Sr(1)-S(2) bond lengths. Cu(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form distorted CuS4 tetrahedra that share corners with four equivalent Cu(1)S4 tetrahedra and corners with four equivalent Pb(1)S4 tetrahedra. There is one shorter (2.28 Å) and one longer (2.34 Å) Cu(1)-S(1) bond length. There is one shorter (2.27 Å) and one longer (2.34 Å) Cu(1)-S(2) bond length. Pb(1) is bonded to two equivalent S(1) and two equivalent S(2) atoms to form PbS4 tetrahedra that share corners with eight equivalent Cu(1)S4 tetrahedra. Both Pb(1)-S(1) bond lengths are 2.61 Å. Both Pb(1)-S(2) bond lengths are 2.59 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent Cu(1), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing SSr2Cu2Pb trigonal bipyramids. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Pb(1) atom.