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Synthesis and Raman spectroscopic characterisation of hydrotalcite with CO 3 2− and VO 3 − anions in the interlayer
Author(s) -
Palmer Sara J.,
Nguyen Tai,
Frost Ray L.
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1820
Subject(s) - hydrotalcite , carbonate , raman spectroscopy , vanadate , chemistry , infrared spectroscopy , inorganic chemistry , hydrogen bond , carbonate ion , hydrogen , molecule , catalysis , organic chemistry , physics , optics
Infrared and Raman spectroscopy were used to characterise synthetic mixed carbonate and vanadate hydrotalcites of formula Mg 6 Al 2 (OH) 16 (CO 3 ) 2− , (VO 4 ) 3− ·4H 2 O. The spectra were used to assess the molecular assembly of the cations and anions in the hydrotalcite structure. The spectra may be conveniently subdivided into spectral features based on (1) the carbonate anion (2) the hydroxyl units and (3) water units. Bands were assigned to the hydroxyl stretching vibrations of water. Three types of carbonate anions were identified: (1) carbonate hydrogen‐bonded to water in the interlayer, (2) carbonate hydrogen‐bonded to the hydrotalcite hydroxyl surface and (3) free carbonate anions. It is proposed that the water is highly structured in the hydrotalcite, as it is hydrogen‐bonded to both the carbonate and the hydroxyl surface. The spectra were used to assess the contamination of carbonate in an open reacting vessel in the synthesis of vanadate hydrotalcites of formula Mg 6 Al 2 (OH) 16 (CO 3 ) 2− , (VO 4 ) 3− ·4H 2 O. Bands have been assigned to vanadate anions in the infrared and Raman spectra associated with VO bonds. Copyright © 2007 John Wiley & Sons, Ltd.