New M⁺, M³⁺-arsenates - the framework structures of AgM³⁺(HAsO₄)₂ (M³⁺ = Al, Ga) and M⁺GaAs₂O₇ (M⁺ = Na, Ag)

Author(s)

Karolina Schwendtner, Uwe Kolitsch

Abstract

The crystal structures of hydrothermally synthesized silver(I) aluminium bis[hydrogen arsenate(V)], AgAl(HAsO

₄)

₂, silver(I) gallium bis[hydrogen arsenate(V)], AgGa(HAsO

₄)

₂, silver gallium diarsenate(V), AgGaAs

₂O

₇, and sodium gallium diarsenate(V), NaGaAs

₂O

₇, were determined from single-crystal X-ray diffraction data collected at room temperature. The first two compounds are representatives of the MCV-3 structure type known for KSc(HAsO

₄)

₂, which is characterized by a three-dimensional anionic framework of corner-sharing alternating M

³⁺O

₆ octahedra (M = Al, Ga) and singly protonated AsO

₄ tetrahedra. Intersecting channels parallel to [101] and [110] host the Ag

⁺ cations, which are positionally disordered in the Ga compound, but not in the Al compound. The hydrogen bonds are relatively strong, with O⋯O donor-acceptor distances of 2.6262(17) and 2.6240(19)Å for the Al and Ga compounds, respectively. The two diarsenate compounds are representatives of the NaAlAs

₂O

₇ structure type, characterized by an anionic framework topology built of M

³⁺O

₆ octahedra (M = Al, Ga) sharing corners with diarsenate groups, and M

⁺ cations (M = Ag) hosted in the voids of the framework. Both structures are characterized by a staggered conformation of the As

₂O

₇ groups.

Organisation(s)

Department of Mineralogy and Crystallography

External organisation(s)

Naturhistorisches Museum Wien (NHM), Technische Universität Wien

Journal

Acta Crystallographica. Section E: Structure Reports Online

Volume

E73

Pages

785-790

No. of pages

6

ISSN

1600-5368

DOI

https://doi.org/10.1107/S2056989017005631

Publication date

05-2017

Peer reviewed

Yes

Austrian Fields of Science 2012

105113 Crystallography

Keywords

ASJC Scopus subject areas

Condensed Matter Physics, General Chemistry, General Materials Science

Portal url

https://ucrisportal.univie.ac.at/en/publications/98c163a4-72bd-44a6-a954-94ef3e604076