Rb2TaCuS4 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. Ta(1) is bonded to four equivalent S(1) atoms to form TaS4 tetrahedra that share edges with two equivalent Cu(1)S4 tetrahedra. Cu(1) is bonded to four equivalent S(1) atoms to form distorted CuS4 tetrahedra that share edges with two equivalent Ta(1)S4 tetrahedra. S(1) is bonded in a 6-coordinate geometry to four equivalent Rb(1), one Ta(1), and one Cu(1) atom.
Rb2TaCuS4 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 8-coordinate geometry to eight equivalent S(1) atoms. There are a spread of Rb(1)-S(1) bond distances ranging from 3.52-3.74 Å. Ta(1) is bonded to four equivalent S(1) atoms to form TaS4 tetrahedra that share edges with two equivalent Cu(1)S4 tetrahedra. All Ta(1)-S(1) bond lengths are 2.30 Å. Cu(1) is bonded to four equivalent S(1) atoms to form distorted CuS4 tetrahedra that share edges with two equivalent Ta(1)S4 tetrahedra. All Cu(1)-S(1) bond lengths are 2.35 Å. S(1) is bonded in a 6-coordinate geometry to four equivalent Rb(1), one Ta(1), and one Cu(1) atom.