The crystal structures of hydro-thermally synthesized ( = 493 K, 7-9 d) rubidium gallium bis-[hydrogenarsenate(V)], RbGa(HAsO), and rubidium digallium arsenic(V) hexa-[hydrogenarsenate(V)], RbGaAs(HAsO), were solved by single-crystal X-ray diffraction. Both compounds have tetra-hedral-octa-hedral framework topologies. The cations are located in channels of the respective framework. RbGa(HAsO) crystallizes in the RbFe(HPO) structure type (), while RbGaAs(HAsO) adopts the structure type of RbAlAs(HAsO) (), which represents a modification of the RbFe(HPO) structure type. In this modification, one third of the O octa-hedra are replaced by AsO octa-hedra, and two thirds of the voids in the structure, which are usually filled by cations, remain empty to achieve charge balance.
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