Schwendtner K, Kolitsch U. M
3+(H
2AsO
4)(H
2As
2O
7) (M
3+ = Al, Ga) and In
2(H
2AsO
4)
2(H
2As
2O
7)
2: a new layer structure type and a new framework structure type containing the rare H
2As
2O
72- group.
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017;
73:600-608. [PMID:
28776510 DOI:
10.1107/s2053229617009676]
[Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 06/30/2017] [Indexed: 11/10/2022]
Abstract
The crystal structures of hydrothermally synthesized aluminium dihydrogen arsenate(V) dihydrogen diarsenate(V), Al(H2AsO4)(H2As2O7), gallium dihydrogen arsenate(V) dihydrogen diarsenate(V), Ga(H2AsO4)(H2As2O7), and diindium bis[dihydrogen arsenate(V)] bis[dihydrogen diarsenate(V)], In2(H2AsO4)2(H2As2O7)2, were determined from single-crystal X-ray diffraction data collected at room temperature. The first two compounds are representatives of a novel sheet structure type, whereas the third compound crystallizes in a novel framework structure. In all three structures, the basic building units are M3+O6 octahedra (M = Al, Ga, In) that are connected via one H2AsO4- and two H2As2O72- groups into chains, and further via H2As2O72- groups into layers. In Al/Ga(H2AsO4)(H2As2O7), these layers are interconnected by weak-to-medium-strong hydrogen bonds. In In2(H2AsO4)2(H2As2O7)2, the H2As2O72- groups link the chains in three dimensions, thus creating a framework topology, which is reinforced by weak-to-medium-strong hydrogen bonds. The three title arsenates represent the first compounds containing both H2AsO4- and H2As2O72- groups.
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