Cu15Bi4(Se4I)4 is Chalcostibite-derived structured and crystallizes in the monoclinic Pm space group. There are fifteen inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one Se(10), one Se(9), and two equivalent Se(16) atoms. In the second Cu site, Cu(2) is bonded in a distorted trigonal non-coplanar geometry to one Se(10), one Se(9), and two equivalent Se(15) atoms. In the third Cu site, Cu(3) is bonded in a distorted trigonal non-coplanar geometry to one Se(11), one Se(12), and two equivalent Se(14) atoms. In the fourth Cu site, Cu(4) is bonded in a distorted trigonal non-coplanar geometry to one Se(11), one Se(12), and two equivalent Se(13) atoms. In the fifth Cu site, Cu(5) is bonded to one Se(14), one Se(6), and two equivalent Se(12) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(10)Se2I2 tetrahedra,  a cornercorner with one Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(5)Se4 tetrahedra. In the sixth Cu site, Cu(6) is bonded to one Se(13), one Se(5), and two equivalent Se(11) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(10)Se2I2 tetrahedra,  a cornercorner with one Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(6)Se4 tetrahedra. In the seventh Cu site, Cu(7) is bonded to one Se(16), one Se(8), and two equivalent Se(10) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(11)Se2I2 tetrahedra,  a cornercorner with one Cu(12)Se2I2 tetrahedra, and corners with two equivalent Cu(7)Se4 tetrahedra. In the eighth Cu site, Cu(8) is bonded to one Se(15), one Se(7), and two equivalent Se(9) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(11)Se2I2 tetrahedra,  a cornercorner with one Cu(12)Se2I2 tetrahedra, and corners with two equivalent Cu(8)Se4 tetrahedra. In the ninth Cu site, Cu(9) is bonded to one Se(13), one Se(6), and two equivalent I(4) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids,  a cornercorner with one Cu(5)Se4 tetrahedra,  a cornercorner with one Cu(6)Se4 tetrahedra, corners with two equivalent Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(15)Se3I tetrahedra. In the tenth Cu site, Cu(10) is bonded to one Se(14), one Se(5), and two equivalent I(3) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(5)Se4 tetrahedra,  a cornercorner with one Cu(6)Se4 tetrahedra, corners with two equivalent Cu(10)Se2I2 tetrahedra, and corners with two equivalent Cu(14)Se3I tetrahedra. In the eleventh Cu site, Cu(11) is bonded to one Se(15), one Se(8), and two equivalent I(2) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids,  a cornercorner with one Cu(7)Se4 tetrahedra,  a cornercorner with one Cu(8)Se4 tetrahedra, corners with two equivalent Cu(11)Se2I2 tetrahedra, and corners with two equivalent Cu(13)Se3I tetrahedra. In the twelfth Cu site, Cu(12) is bonded to one Se(16), one Se(7), and two equivalent I(1) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(7)Se4 tetrahedra,  a cornercorner with one Cu(8)Se4 tetrahedra, and corners with two equivalent Cu(12)Se2I2 tetrahedra. In the thirteenth Cu site, Cu(13) is bonded to one Se(2), two equivalent Se(4), and one I(2) atom to form distorted CuSe3I tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Cu(11)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra,  an edgeedge with one Bi(1)Se5 square pyramid, and edges with two equivalent Cu(15)Se3I tetrahedra. In the fourteenth Cu site, Cu(14) is bonded to one Se(3), two equivalent Se(1), and one I(3) atom to form CuSe3I tetrahedra that share corners with two equivalent Bi(2)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids, corners with two equivalent Cu(10)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, and  an edgeedge with one Bi(4)Se5 square pyramid. In the fifteenth Cu site, Cu(15) is bonded to one Se(4), two equivalent Se(2), and one I(4) atom to form distorted CuSe3I tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Cu(9)Se2I2 tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra,  an edgeedge with one Bi(3)Se5 square pyramid, and edges with two equivalent Cu(13)Se3I tetrahedra. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Se(9), two equivalent Se(4), and two equivalent Se(8) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(11)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra, corners with two equivalent Cu(7)Se4 tetrahedra, corners with two equivalent Cu(8)Se4 tetrahedra, edges with two equivalent Bi(1)Se5 square pyramids, and  an edgeedge with one Cu(13)Se3I tetrahedra. In the second Bi site, Bi(2) is bonded to one Se(10), two equivalent Se(3), and two equivalent Se(7) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(12)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, corners with two equivalent Cu(7)Se4 tetrahedra, corners with two equivalent Cu(8)Se4 tetrahedra, and edges with two equivalent Bi(2)Se5 square pyramids. In the third Bi site, Bi(3) is bonded to one Se(11), two equivalent Se(2), and two equivalent Se(6) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(9)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra, corners with two equivalent Cu(5)Se4 tetrahedra, corners with two equivalent Cu(6)Se4 tetrahedra, edges with two equivalent Bi(3)Se5 square pyramids, and  an edgeedge with one Cu(15)Se3I tetrahedra. In the fourth Bi site, Bi(4) is bonded to one Se(12), two equivalent Se(1), and two equivalent Se(5) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(10)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, corners with two equivalent Cu(5)Se4 tetrahedra, corners with two equivalent Cu(6)Se4 tetrahedra, edges with two equivalent Bi(4)Se5 square pyramids, and  an edgeedge with one Cu(14)Se3I tetrahedra. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cu(14), two equivalent Bi(4), and one Se(14) atom. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to one Cu(13), two equivalent Cu(15), two equivalent Bi(3), and one Se(13) atom. In the third Se site, Se(3) is bonded in a 4-coordinate geometry to one Cu(14), two equivalent Bi(2), and one Se(16) atom. In the fourth Se site, Se(4) is bonded in a 6-coordinate geometry to one Cu(15), two equivalent Cu(13), two equivalent Bi(1), and one Se(15) atom. In the fifth Se site, Se(5) is bonded to one Cu(10), one Cu(6), and two equivalent Bi(4) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the sixth Se site, Se(6) is bonded to one Cu(5), one Cu(9), and two equivalent Bi(3) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the seventh Se site, Se(7) is bonded to one Cu(12), one Cu(8), and two equivalent Bi(2) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the eighth Se site, Se(8) is bonded to one Cu(11), one Cu(7), and two equivalent Bi(1) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the ninth Se site, Se(9) is bonded in a 5-coordinate geometry to one Cu(1), one Cu(2), two equivalent Cu(8), and one Bi(1) atom. In the tenth Se site, Se(10) is bonded in a 5-coordinate geometry to one Cu(1), one Cu(2), two equivalent Cu(7), and one Bi(2) atom. In the eleventh Se site, Se(11) is bonded in a 5-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(6), and one Bi(3) atom. In the twelfth Se site, Se(12) is bonded in a 5-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(5), and one Bi(4) atom. In the thirteenth Se site, Se(13) is bonded in a 5-coordinate geometry to one Cu(6), one Cu(9), two equivalent Cu(4), and one Se(2) atom. In the fourteenth Se site, Se(14) is bonded in a 5-coordinate geometry to one Cu(10), one Cu(5), two equivalent Cu(3), and one Se(1) atom. In the fifteenth Se site, Se(15) is bonded in a 5-coordinate geometry to one Cu(11), one Cu(8), two equivalent Cu(2), and one Se(4) atom. In the sixteenth Se site, Se(16) is bonded in a 5-coordinate geometry to one Cu(12), one Cu(7), two equivalent Cu(1), and one Se(3) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a water-like geometry to two equivalent Cu(12) atoms. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(13) and two equivalent Cu(11) atoms. In the third I site, I(3) is bonded in a distorted trigonal non-coplanar geometry to one Cu(14) and two equivalent Cu(10) atoms. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one Cu(15) and two equivalent Cu(9) atoms.
Cu15Bi4(Se4I)4 is Chalcostibite-derived structured and crystallizes in the monoclinic Pm space group. There are fifteen inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one Se(10), one Se(9), and two equivalent Se(16) atoms. The Cu(1)-Se(10) bond length is 2.89 Å. The Cu(1)-Se(9) bond length is 2.44 Å. Both Cu(1)-Se(16) bond lengths are 2.41 Å. In the second Cu site, Cu(2) is bonded in a distorted trigonal non-coplanar geometry to one Se(10), one Se(9), and two equivalent Se(15) atoms. The Cu(2)-Se(10) bond length is 2.43 Å. The Cu(2)-Se(9) bond length is 3.01 Å. Both Cu(2)-Se(15) bond lengths are 2.37 Å. In the third Cu site, Cu(3) is bonded in a distorted trigonal non-coplanar geometry to one Se(11), one Se(12), and two equivalent Se(14) atoms. The Cu(3)-Se(11) bond length is 2.43 Å. The Cu(3)-Se(12) bond length is 2.92 Å. Both Cu(3)-Se(14) bond lengths are 2.40 Å. In the fourth Cu site, Cu(4) is bonded in a distorted trigonal non-coplanar geometry to one Se(11), one Se(12), and two equivalent Se(13) atoms. The Cu(4)-Se(11) bond length is 3.01 Å. The Cu(4)-Se(12) bond length is 2.42 Å. Both Cu(4)-Se(13) bond lengths are 2.37 Å. In the fifth Cu site, Cu(5) is bonded to one Se(14), one Se(6), and two equivalent Se(12) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(10)Se2I2 tetrahedra,  a cornercorner with one Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(5)Se4 tetrahedra. The Cu(5)-Se(14) bond length is 2.50 Å. The Cu(5)-Se(6) bond length is 2.45 Å. Both Cu(5)-Se(12) bond lengths are 2.45 Å. In the sixth Cu site, Cu(6) is bonded to one Se(13), one Se(5), and two equivalent Se(11) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(10)Se2I2 tetrahedra,  a cornercorner with one Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(6)Se4 tetrahedra. The Cu(6)-Se(13) bond length is 2.51 Å. The Cu(6)-Se(5) bond length is 2.44 Å. Both Cu(6)-Se(11) bond lengths are 2.47 Å. In the seventh Cu site, Cu(7) is bonded to one Se(16), one Se(8), and two equivalent Se(10) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(11)Se2I2 tetrahedra,  a cornercorner with one Cu(12)Se2I2 tetrahedra, and corners with two equivalent Cu(7)Se4 tetrahedra. The Cu(7)-Se(16) bond length is 2.51 Å. The Cu(7)-Se(8) bond length is 2.46 Å. Both Cu(7)-Se(10) bond lengths are 2.45 Å. In the eighth Cu site, Cu(8) is bonded to one Se(15), one Se(7), and two equivalent Se(9) atoms to form distorted CuSe4 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(11)Se2I2 tetrahedra,  a cornercorner with one Cu(12)Se2I2 tetrahedra, and corners with two equivalent Cu(8)Se4 tetrahedra. The Cu(8)-Se(15) bond length is 2.51 Å. The Cu(8)-Se(7) bond length is 2.42 Å. Both Cu(8)-Se(9) bond lengths are 2.48 Å. In the ninth Cu site, Cu(9) is bonded to one Se(13), one Se(6), and two equivalent I(4) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(3)Se5 square pyramids,  a cornercorner with one Cu(5)Se4 tetrahedra,  a cornercorner with one Cu(6)Se4 tetrahedra, corners with two equivalent Cu(9)Se2I2 tetrahedra, and corners with two equivalent Cu(15)Se3I tetrahedra. The Cu(9)-Se(13) bond length is 2.44 Å. The Cu(9)-Se(6) bond length is 2.35 Å. Both Cu(9)-I(4) bond lengths are 2.63 Å. In the tenth Cu site, Cu(10) is bonded to one Se(14), one Se(5), and two equivalent I(3) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(4)Se5 square pyramids,  a cornercorner with one Cu(5)Se4 tetrahedra,  a cornercorner with one Cu(6)Se4 tetrahedra, corners with two equivalent Cu(10)Se2I2 tetrahedra, and corners with two equivalent Cu(14)Se3I tetrahedra. The Cu(10)-Se(14) bond length is 2.46 Å. The Cu(10)-Se(5) bond length is 2.35 Å. Both Cu(10)-I(3) bond lengths are 2.62 Å. In the eleventh Cu site, Cu(11) is bonded to one Se(15), one Se(8), and two equivalent I(2) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids,  a cornercorner with one Cu(7)Se4 tetrahedra,  a cornercorner with one Cu(8)Se4 tetrahedra, corners with two equivalent Cu(11)Se2I2 tetrahedra, and corners with two equivalent Cu(13)Se3I tetrahedra. The Cu(11)-Se(15) bond length is 2.44 Å. The Cu(11)-Se(8) bond length is 2.35 Å. Both Cu(11)-I(2) bond lengths are 2.64 Å. In the twelfth Cu site, Cu(12) is bonded to one Se(16), one Se(7), and two equivalent I(1) atoms to form CuSe2I2 tetrahedra that share corners with two equivalent Bi(2)Se5 square pyramids,  a cornercorner with one Cu(7)Se4 tetrahedra,  a cornercorner with one Cu(8)Se4 tetrahedra, and corners with two equivalent Cu(12)Se2I2 tetrahedra. The Cu(12)-Se(16) bond length is 2.47 Å. The Cu(12)-Se(7) bond length is 2.37 Å. Both Cu(12)-I(1) bond lengths are 2.63 Å. In the thirteenth Cu site, Cu(13) is bonded to one Se(2), two equivalent Se(4), and one I(2) atom to form distorted CuSe3I tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Cu(11)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra,  an edgeedge with one Bi(1)Se5 square pyramid, and edges with two equivalent Cu(15)Se3I tetrahedra. The Cu(13)-Se(2) bond length is 2.51 Å. Both Cu(13)-Se(4) bond lengths are 2.46 Å. The Cu(13)-I(2) bond length is 2.69 Å. In the fourteenth Cu site, Cu(14) is bonded to one Se(3), two equivalent Se(1), and one I(3) atom to form CuSe3I tetrahedra that share corners with two equivalent Bi(2)Se5 square pyramids, corners with two equivalent Bi(4)Se5 square pyramids, corners with two equivalent Cu(10)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, and  an edgeedge with one Bi(4)Se5 square pyramid. The Cu(14)-Se(3) bond length is 2.38 Å. Both Cu(14)-Se(1) bond lengths are 2.45 Å. The Cu(14)-I(3) bond length is 2.73 Å. In the fifteenth Cu site, Cu(15) is bonded to one Se(4), two equivalent Se(2), and one I(4) atom to form distorted CuSe3I tetrahedra that share corners with two equivalent Bi(1)Se5 square pyramids, corners with two equivalent Bi(3)Se5 square pyramids, corners with two equivalent Cu(9)Se2I2 tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra,  an edgeedge with one Bi(3)Se5 square pyramid, and edges with two equivalent Cu(13)Se3I tetrahedra. The Cu(15)-Se(4) bond length is 2.51 Å. Both Cu(15)-Se(2) bond lengths are 2.46 Å. The Cu(15)-I(4) bond length is 2.69 Å. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one Se(9), two equivalent Se(4), and two equivalent Se(8) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(11)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra, corners with two equivalent Cu(7)Se4 tetrahedra, corners with two equivalent Cu(8)Se4 tetrahedra, edges with two equivalent Bi(1)Se5 square pyramids, and  an edgeedge with one Cu(13)Se3I tetrahedra. The Bi(1)-Se(9) bond length is 2.73 Å. Both Bi(1)-Se(4) bond lengths are 3.26 Å. Both Bi(1)-Se(8) bond lengths are 2.81 Å. In the second Bi site, Bi(2) is bonded to one Se(10), two equivalent Se(3), and two equivalent Se(7) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(12)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, corners with two equivalent Cu(7)Se4 tetrahedra, corners with two equivalent Cu(8)Se4 tetrahedra, and edges with two equivalent Bi(2)Se5 square pyramids. The Bi(2)-Se(10) bond length is 2.76 Å. Both Bi(2)-Se(3) bond lengths are 3.08 Å. Both Bi(2)-Se(7) bond lengths are 2.88 Å. In the third Bi site, Bi(3) is bonded to one Se(11), two equivalent Se(2), and two equivalent Se(6) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(9)Se2I2 tetrahedra, corners with two equivalent Cu(13)Se3I tetrahedra, corners with two equivalent Cu(15)Se3I tetrahedra, corners with two equivalent Cu(5)Se4 tetrahedra, corners with two equivalent Cu(6)Se4 tetrahedra, edges with two equivalent Bi(3)Se5 square pyramids, and  an edgeedge with one Cu(15)Se3I tetrahedra. The Bi(3)-Se(11) bond length is 2.73 Å. Both Bi(3)-Se(2) bond lengths are 3.25 Å. Both Bi(3)-Se(6) bond lengths are 2.82 Å. In the fourth Bi site, Bi(4) is bonded to one Se(12), two equivalent Se(1), and two equivalent Se(5) atoms to form BiSe5 square pyramids that share corners with two equivalent Cu(10)Se2I2 tetrahedra, corners with two equivalent Cu(14)Se3I tetrahedra, corners with two equivalent Cu(5)Se4 tetrahedra, corners with two equivalent Cu(6)Se4 tetrahedra, edges with two equivalent Bi(4)Se5 square pyramids, and  an edgeedge with one Cu(14)Se3I tetrahedra. The Bi(4)-Se(12) bond length is 2.76 Å. Both Bi(4)-Se(1) bond lengths are 3.27 Å. Both Bi(4)-Se(5) bond lengths are 2.84 Å. There are sixteen inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cu(14), two equivalent Bi(4), and one Se(14) atom. The Se(1)-Se(14) bond length is 2.50 Å. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to one Cu(13), two equivalent Cu(15), two equivalent Bi(3), and one Se(13) atom. The Se(2)-Se(13) bond length is 2.52 Å. In the third Se site, Se(3) is bonded in a 4-coordinate geometry to one Cu(14), two equivalent Bi(2), and one Se(16) atom. The Se(3)-Se(16) bond length is 2.46 Å. In the fourth Se site, Se(4) is bonded in a 6-coordinate geometry to one Cu(15), two equivalent Cu(13), two equivalent Bi(1), and one Se(15) atom. The Se(4)-Se(15) bond length is 2.53 Å. In the fifth Se site, Se(5) is bonded to one Cu(10), one Cu(6), and two equivalent Bi(4) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the sixth Se site, Se(6) is bonded to one Cu(5), one Cu(9), and two equivalent Bi(3) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the seventh Se site, Se(7) is bonded to one Cu(12), one Cu(8), and two equivalent Bi(2) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the eighth Se site, Se(8) is bonded to one Cu(11), one Cu(7), and two equivalent Bi(1) atoms to form corner-sharing SeCu2Bi2 tetrahedra. In the ninth Se site, Se(9) is bonded in a 5-coordinate geometry to one Cu(1), one Cu(2), two equivalent Cu(8), and one Bi(1) atom. In the tenth Se site, Se(10) is bonded in a 5-coordinate geometry to one Cu(1), one Cu(2), two equivalent Cu(7), and one Bi(2) atom. In the eleventh Se site, Se(11) is bonded in a 5-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(6), and one Bi(3) atom. In the twelfth Se site, Se(12) is bonded in a 5-coordinate geometry to one Cu(3), one Cu(4), two equivalent Cu(5), and one Bi(4) atom. In the thirteenth Se site, Se(13) is bonded in a 5-coordinate geometry to one Cu(6), one Cu(9), two equivalent Cu(4), and one Se(2) atom. In the fourteenth Se site, Se(14) is bonded in a 5-coordinate geometry to one Cu(10), one Cu(5), two equivalent Cu(3), and one Se(1) atom. In the fifteenth Se site, Se(15) is bonded in a 5-coordinate geometry to one Cu(11), one Cu(8), two equivalent Cu(2), and one Se(4) atom. In the sixteenth Se site, Se(16) is bonded in a 5-coordinate geometry to one Cu(12), one Cu(7), two equivalent Cu(1), and one Se(3) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a water-like geometry to two equivalent Cu(12) atoms. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(13) and two equivalent Cu(11) atoms. In the third I site, I(3) is bonded in a distorted trigonal non-coplanar geometry to one Cu(14) and two equivalent Cu(10) atoms. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one Cu(15) and two equivalent Cu(9) atoms.