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    Crystal structure of magnesium selenate heptahydrate, MgSeO4·7H2O, from neutron time-of-flight data

    Fortes, Andrew Dominic and Gutmann, M.J. (2014) Crystal structure of magnesium selenate heptahydrate, MgSeO4·7H2O, from neutron time-of-flight data. Acta Crystallographica Section E: Structure Reports Online 70 (9), pp. 134-137. ISSN 1600-5368.

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    Abstract

    MgSeO4·7H2O is isostructural with the analogous sulfate, MgSO4·7H2O, consisting of isolated [Mg(H2O)6](2+) octa-hedra and [SeO4](2-) tetra-hedra, linked by O-H⋯O hydrogen bonds, with a single inter-stitial lattice water mol-ecule. As in the sulfate, the [Mg(H2O)6](2+) coordination octa-hedron is elongated along one axis due to the tetra-hedral coordination of the two apical water mol-ecules; these have Mg-O distances of ∼2.10 Å, whereas the remaining four trigonally coordinated water mol-ecules have Mg-O distances of ∼2.05 Å. The mean Se-O bond length is 1.641 Å and is in excellent agreement with other selenates. The unit-cell volume of MgSeO4·7H2O at 10 K is 4.1% larger than that of the sulfate at 2 K, although this is not uniform; the greater part of the expansion is along the a axis of the crystal.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): crystal structure, hydrogen bonding, magnesium selenate hepta­hydrate, neutron Laue diffraction
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 24 Nov 2014 14:30
    Last Modified: 27 Jul 2019 08:36
    URI: http://eprints.bbk.ac.uk/id/eprint/11100

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