Abstract
The crystal structure of hydro-thermally synthesized (T = 493 K, 7 d) caesium gallium bis-[hydrogen arsenate(V)], CsGa(HAsO4)2, was solved by single-crystal X-ray diffraction. The compound crystallizes in the common RbAl(HAsO4)2 structure type (R32) and consists of a basic tetra-hedral-octa-hedral framework topology that houses Cs+ cations in its channels. The AsO4 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.
Highlights
Compounds with mixed tetrahedral–octahedral (T–O) framework structures are characterized by a broad range of different atomic arrangements
Six arsenates of the CsAl2As(HAsO4)6 type are known with the following M+M3+ combinations: RbGa, CsGa, TlGa, RbAl, CsAl and CsFe (Schwendtner & Kolitsch, 2018a,c,d)
Syntheses aimed at preparing (NH4)Sc(HAsO4)2, RbSc(HAsO4)2 and TlSc(HAsO4)2 instead led to the crystallization of the diarsenate compounds (NH4)ScAs2O7 (Kolitsch, 2004), RbScAs2O7 (Schwendtner & Kolitsch, 2004) and TlScAs2O7 (Baran et al, 2006), respectively
Summary
Compounds with mixed tetrahedral–octahedral (T–O) framework structures are characterized by a broad range of different atomic arrangements. Six arsenates of the CsAl2As(HAsO4) type are known with the following M+M3+ combinations: RbGa, CsGa, TlGa, RbAl, CsAl and CsFe (Schwendtner & Kolitsch, 2018a,c,d). CsGa(HAsO4) represents the third representative of the RbAl(HAsO4)2-type atomic arrangement, of which previously only the two M+M3+ combinations RbAl and CsFe (Schwendtner & Kolitsch, 2018a) were known. Symmetry code: (iii) Àx þ y þ 1; Àx þ 1; z These types of compounds are rather large (M = Cs, Rb, Tl and NH4), with ionic radii ranging from 1.70 to 1.88 A (Shannon, 1976).
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