RbNbAsO5Cl crystallizes in the tetragonal P4/nmm space group. Rb(1) is bonded to four equivalent O(1) and four equivalent Cl(1) atoms to form distorted RbCl4O4 hexagonal bipyramids that share corners with four equivalent Rb(1)Cl4O4 hexagonal bipyramids, edges with four equivalent Rb(1)Cl4O4 hexagonal bipyramids, and edges with two equivalent As(1)O4 tetrahedra. Nb(1) is bonded in a 5-coordinate geometry to one O(2), four equivalent O(1), and one Cl(1) atom. As(1) is bonded to four equivalent O(1) atoms to form AsO4 tetrahedra that share edges with two equivalent Rb(1)Cl4O4 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one As(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Nb(1) atom. Cl(1) is bonded to four equivalent Rb(1) and one Nb(1) atom to form a mixture of corner and edge-sharing ClRb4Nb square pyramids.
RbNbAsO5Cl crystallizes in the tetragonal P4/nmm space group. Rb(1) is bonded to four equivalent O(1) and four equivalent Cl(1) atoms to form distorted RbCl4O4 hexagonal bipyramids that share corners with four equivalent Rb(1)Cl4O4 hexagonal bipyramids, edges with four equivalent Rb(1)Cl4O4 hexagonal bipyramids, and edges with two equivalent As(1)O4 tetrahedra. All Rb(1)-O(1) bond lengths are 3.17 Å. All Rb(1)-Cl(1) bond lengths are 3.42 Å. Nb(1) is bonded in a 5-coordinate geometry to one O(2), four equivalent O(1), and one Cl(1) atom. The Nb(1)-O(2) bond length is 1.74 Å. All Nb(1)-O(1) bond lengths are 2.07 Å. The Nb(1)-Cl(1) bond length is 2.70 Å. As(1) is bonded to four equivalent O(1) atoms to form AsO4 tetrahedra that share edges with two equivalent Rb(1)Cl4O4 hexagonal bipyramids. All As(1)-O(1) bond lengths are 1.72 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one As(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Nb(1) atom. Cl(1) is bonded to four equivalent Rb(1) and one Nb(1) atom to form a mixture of corner and edge-sharing ClRb4Nb square pyramids.