The crystal structures of hydro-thermally synthesized ( = 493 K, 7 d) thallium(I) digallium arsenic(V) hexa-kis-[hydrogenarsenate(V)], TlGaAs(HAsO), caes-ium digallium arsenic(V) hexa-kis-[hydrogenarsenate(V)], CsGaAs(HAsO), and caesium dialuminium arsenic(V) hexa-kis-[hydrogenarsenate(V)], CsAlAs(HAsO), were solved by single-crystal X-ray diffraction. The three compounds are isotypic and adopt the structure type of RbAlAs(HAsO) (), which itself represents a modification of the RbFe(HPO) structure type and consists of a tetra-hedral-octa-hedral framework in which the slightly disordered cations are located in channels. The three new compounds contain AsO octa-hedra assuming the topological role of O octa-hedra. The As-O bond lengths are among the shortest As-O bond lengths known so far in AsO octa-hedra.
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| http://dx.doi.org/10.1107/S2056989018010721 | DOI Listing |
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