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Raman spectroscopic study of synthetic reevesite and cobalt substituted reevesite (Ni,Co) 6 Fe 2 (OH) 16 (CO 3 )·4H 2 O
Author(s) -
Frost Ray L.,
Bakon Kathleen H.,
Palmer Sara J.
Publication year - 2010
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.2280
Subject(s) - raman spectroscopy , brucite , carbonate , infrared spectroscopy , cobalt , chemistry , hydrotalcite , infrared , spectroscopy , ion , analytical chemistry (journal) , hydrogen bond , inorganic chemistry , molecule , magnesium , catalysis , optics , biochemistry , chromatography , physics , organic chemistry , quantum mechanics
Raman spectroscopy, complemented with infrared spectroscopy of compounds equivalent to reevesite, formula (Ni,Co) 6 Fe 2 (OH) 16 (CO 3 )·4H 2 O, with the ratio of Ni/Co ranging from 0 to 1, have been synthesised and characterised based on the molecular structure of the synthesised mineral. The combination of Raman spectroscopy with infrared spectroscopy enables an assessment of bands attributable to water stretching and brucite‐like surface hydroxyl units to be obtained. Raman spectroscopy shows a reduction in the symmetry of the carbonate anion, leading to the conclusion that the carbonate anion is bonded to the brucite‐like hydroxyl surface and to the water in the interlayer. Variation in the position of the carbonate anion stretching vibrations occurs and is dependent on the Ni/Co ratio. Water bending modes are identified in both the Raman and infrared spectra at positions greater than 1620 cm −1 , indicating that water is strongly hydrogen bonded to both the interlayer anions and the hydrotalcite surface. Copyright © 2009 John Wiley & Sons, Ltd.