Raman spectroscopy of hydrotalcites with sulphate, molybdate and chromate in the interlayer

Raman microscopy has been used to characterize the interlayer anions in synthesized hydrotalcites of formula Mg6Al2(OH)16(XO4)·4H2O, where X is S, Mo or Cr. The Raman spectrum shows that both the chromate and molybdate anions are not polymerized in the hydrotalcite interlayer. This lack of polymeriz...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2005-10, Vol.36 (10), p.925-931
Main Authors: Frost, Ray L., Musumeci, Anthony W., Martens, Wayde N., Adebajo, Moses O., Bouzaid, Jocelyn
Format: Article
Language:English
Subjects:
Anions
Bonding
brucite
carrboydite
Chromates
hydrohonessite
hydrotalcite
Interlayers
Molybdates
mountkeithite
Polymerization
Raman microscopy
Raman spectroscopy
Sulfates
takovite
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Summary:Raman microscopy has been used to characterize the interlayer anions in synthesized hydrotalcites of formula Mg6Al2(OH)16(XO4)·4H2O, where X is S, Mo or Cr. The Raman spectrum shows that both the chromate and molybdate anions are not polymerized in the hydrotalcite interlayer. This lack of polymerization is attributed to the effect of pH during synthesis. A model of bonding is proposed for the interlayer anions based upon the observation of two symmetric stretching modes and symmetry lowering of the chromate, molybdate and sulphate anions. Two types of anions are present, hydrated and hydroxyl surface‐bonded. Copyright © 2005 John Wiley & Sons, Ltd.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.1385