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NaSr(AsO(4))(H(2)O)(9): the (Sr,As) analogue of nabaphite and nastrophite.

ABSTRACT: The crystal structure of the title compound, sodium strontium orthoarsenate(V) nona-hydrate, is isotypic with NaSr(PO(4))(H(2)O)(9) and the minerals nabaphite [NaBa(PO(4))(H(2)O)(9)] and nastrophite [Na(Sr,Ba)(PO(4))(H(2)O)(9)]. The Na and Sr atoms are located on threefold rotation axes and are in the centres of slightly distorted Na(H(2)O)(6) octa-hedra and Sr(H(2)O)(9) tricapped trigonal prisms, respectively. A framework structure is established via edge-sharing of these polyhedra. Disordered AsO(4) tetra-hedra (with threefold symmetry) are situated in the inter-stitial space of the framework. Although reasonable H-atom positions of the water mol-ecules were not established, close O?O contacts between the disordered AsO(4) tetra-hedra and the water mol-ecules suggest strong O-H?O hydrogen bonding.

SUBMITTER: Weil M

PROVIDER: S-EPMC2971340 | biostudies-literature | 2009 Oct

REPOSITORIES: biostudies-literature

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NaSr(AsO(4))(H(2)O)(9): the (Sr,As) analogue of nabaphite and nastrophite.

Weil Matthias M

Acta crystallographica. Section E, Structure reports online 20091010 Pt 11

The crystal structure of the title compound, sodium strontium orthoarsenate(V) nona-hydrate, is isotypic with NaSr(PO(4))(H(2)O)(9) and the minerals nabaphite [NaBa(PO(4))(H(2)O)(9)] and nastrophite [Na(Sr,Ba)(PO(4))(H(2)O)(9)]. The Na and Sr atoms are located on threefold rotation axes and are in the centres of slightly distorted Na(H(2)O)(6) octa-hedra and Sr(H(2)O)(9) tricapped trigonal prisms, respectively. A framework structure is established via edge-sharing of these polyhedra. Disordered ...[more]

PMID: 21578034

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