Abstract
The crystal structure of hydro-thermally synthesized (T = 493 K, 7 d) caesium gallium bis-[hydrogen arsenate(V)], CsGa(HAsO(4))(2), was solved by single-crystal X-ray diffraction. The compound crystallizes in the common RbAl(HAsO(4))(2) structure type (R32) and consists of a basic tetra-hedral-octa-hedral framework topology that houses Cs(+) cations in its channels. The AsO(4) tetra-hedron is disordered over two positions with site occupancy factors of 0.946 (1) and 0.054 (1). Strong hydrogen bonds strengthen the network. The structure was refined as inversion twin.