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Thermo‐Raman spectroscopy of selected layered double hydroxides of formula Cu 6 Al 2 (OH) 16 CO 3 and Zn 6 Al 2 (OH) 16 CO 3
Author(s) -
Frost Ray L.,
Soisnard Aurore,
Voyer Nicolas,
Palmer Sara J.,
Martens Wayde N.
Publication year - 2009
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.2148
Subject(s) - hydrotalcite , raman spectroscopy , layered double hydroxides , carbonate , chemistry , spectroscopy , metal , decomposition , analytical chemistry (journal) , infrared spectroscopy , inorganic chemistry , hydroxide , catalysis , physics , optics , biochemistry , organic chemistry , chromatography , quantum mechanics
Raman spectroscopy using a hot stage was used to characterise layered double hydroxides (LDHs) of the formula (Cu,Zn) 6 Al 2 (OH) 16 (CO 3 ) · 4H 2 O. The spectra were used to assess the molecular assembly of the cations in the LDH structure. The sharp band at 1058 cm −1 for the Zn 6 Al 2 (OH) 16 (CO 3 ) · 4H 2 O is assigned to the ν 1 CO 3 2− symmetric stretching mode. This band shifts to higher wavenumbers and is observed at 1103 cm −1 at 600 °C. It is proposed that metal carbonate species formed during the decomposition of the hydrotalcite structure is responsible for the increase in the band position. The Cu–Al hydrotalcite did not show the same trend. The symmetric stretching mode of carbonate is observed at around 1110 cm −1 , and at temperatures above 200 °C a shoulder appears at around 1210 cm −1 , suggested to be due to CuCO 3 . Copyright © 2008 John Wiley & Sons, Ltd.