(NH4)Ga(HAsO4)2 and TlAl(HAsO4)2 - two new RbFe(HPO4)2-type M + M 3+ arsenates

Karolina Schwendtner; Uwe Kolitsch

doi:10.1107/S2056989018013567

(NH₄)Ga(HAsO₄)₂ and TlAl(HAsO₄)₂ - two new RbFe(HPO₄)₂-type M ⁺ M ³⁺ arsenates

Acta Crystallogr E Crystallogr Commun. 2018 Sep 28;74(Pt 10):1504-1508. doi: 10.1107/S2056989018013567. eCollection 2018 Oct 1.

Authors

Karolina Schwendtner¹, Uwe Kolitsch²

Affiliations

¹ Institute for Chemical Technology and Analytics, Division of Structural Chemistry, TU Wien, Getreidemarkt 9/164-SC, 1060 Vienna, Austria.
² Naturhistorisches Museum, Burgring 7, 1010 Wien, and Institut für Mineralogie und Kristallographie, Universität Wien, Althanstrasse 14, 1090 Wien, Austria.

Abstract

The crystal structures of hydro-thermally synthesized (T = 493 K, 7-9 d) ammonium gallium bis-[hydrogen arsenate(V)], (NH₄)Ga(HAsO₄)₂, and thallium aluminium bis-[hydrogen arsenate(V)], TlAl(HAsO₄)₂, were solved by single-crystal X-ray diffraction. Both compounds crystallize in the common RbFe(HPO₄)₂ structure type (R c) and share the same tetra-hedral-octa-hedral framework topology that houses the M ⁺ cations in its channels. One of the two Tl sites is slightly offset from its ideal position. Strong O-H⋯O hydrogen bonds strengthen the network.

Keywords: (NH4)Ga(HAsO4)2; TlAl(HAsO4)2; crystal structure.

Grants and funding

This work was funded by Doc fForte Fellowship of the Austrian Academy of Sciences to K. Schwendtner grant . Technische Universitat Wien grant .