Rb2NbCuSe4 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. Nb(1) is bonded to four equivalent Se(1) atoms to form NbSe4 tetrahedra that share edges with two equivalent Cu(1)Se4 tetrahedra. Cu(1) is bonded to four equivalent Se(1) atoms to form distorted CuSe4 tetrahedra that share edges with two equivalent Nb(1)Se4 tetrahedra. Se(1) is bonded in a 6-coordinate geometry to four equivalent Rb(1), one Nb(1), and one Cu(1) atom.
Rb2NbCuSe4 crystallizes in the orthorhombic Fddd space group. Rb(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. There are a spread of Rb(1)-Se(1) bond distances ranging from 3.62-3.85 Å. Nb(1) is bonded to four equivalent Se(1) atoms to form NbSe4 tetrahedra that share edges with two equivalent Cu(1)Se4 tetrahedra. All Nb(1)-Se(1) bond lengths are 2.44 Å. Cu(1) is bonded to four equivalent Se(1) atoms to form distorted CuSe4 tetrahedra that share edges with two equivalent Nb(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.47 Å. Se(1) is bonded in a 6-coordinate geometry to four equivalent Rb(1), one Nb(1), and one Cu(1) atom.