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Raman microscopy of haidingerite Ca(AsO3OH)•H2O and brassite Mg(AsO3OH)•4H2O

Frost, Ray L., Bahfenne, Silmarilly, Palmer, Sara J., Cejka, Jiri, Sejkora, Jiri , & Skoda, Radek (2010) Raman microscopy of haidingerite Ca(AsO3OH)•H2O and brassite Mg(AsO3OH)•4H2O. Journal of Raman Spectroscopy, 42(6), pp. 690-693.

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    Abstract

    Raman spectroscopy has been used to study the arsenate minerals haidingerite Ca(AsO3OH)•H2O and brassite Mg(AsO3OH)•4H2O. Intense Raman bands in haidingerite spectrum observed at 745 and 855 cm-1 are assigned to the (AsO3OH)2- ν3 antisymmetric stretching and ν1 symmetric stretching vibrational modes. For brassite two similarly assigned intense bands are found at 809 and 862 cm-1. The observation of multiple Raman bands in the (AsO3OH)2- stretching and bending regions suggests that the arsenate tetrahedrons in the crystal structures of both minerals studied are strongly distorted. Broad Raman bands observed at 2842 cm-1 for haidingerite and 3035 cm-1 for brassite indicate strong hydrogen bonding of water molecules in the structure of these minerals. OH…O hydrogen bond lengths were calculated from the Raman spectra based on empiric relations.

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    19 citations in Scopus
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    18 citations in Web of Science®

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    ID Code: 32770
    Item Type: Journal Article
    Additional URLs:
    Keywords: brassite, haidingerite, hydrogenarsenates, molecular water, hydroxyls, Raman spectroscopy, hydrogen bond lengths
    DOI: 10.1002/jrs.2498
    ISSN: 0377-0486
    Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
    Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
    Divisions: Past > Schools > Chemistry
    Past > QUT Faculties & Divisions > Faculty of Science and Technology
    Copyright Owner: Copyright 2010 John Wiley & Sons
    Deposited On: 18 Jun 2010 07:20
    Last Modified: 01 Mar 2012 00:16

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