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  • Title: A vibrational spectroscopic study of planchéite Cu₈Si₈O₂₂(OH)₄·H₂O.
    Author: Frost RL, Xi Y.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2012 Jun; 91():314-8. PubMed ID: 22387682.
    Abstract:
    Planchéite Cu(8)Si(8)O(22)(OH)(4)·H(2)O is a hydrated copper hydroxy silicate. Raman spectroscopy complimented with infrared spectroscopy has been used to determine the molecular structure of planchéite. Raman bands at around 1048, 1081 and 1127 are described as the ν(1)-SiO(3) symmetric stretching vibrations; Raman bands at 828, 906 are attributed to the ν(3)-SiO(3) antisymmetric stretching vibrations. The Raman band at 699 cm(-1) is assigned to the ν(4) bending modes of the -SiO(3) units. The intense Raman band at 3479 cm(-1) is ascribed to the stretching vibration of the OH units. The Raman band at 3250 cm(-1) is evidence for water in the structure.
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