Infrared Spectra of Oriented and Nonoriented Layered Double Hydroxides in the Range from 4000 to 250 cm-1, with Evidence for Regular Short-Range Order in a Synthetic Magnesium−Aluminum LDH with Mg:Al = 2:1 but Not with Mg:Al = 3:1
作者： Mickey C. Richardson , Paul S. Braterman
DOI: 10.1021/JP064744W
关键词: Analytical chemistry 、 Mineralogy 、 Chloride 、 Hydroxide 、 Infrared spectroscopy 、 Aluminium 、 Polyethylene 、 Magnesium 、 Chemistry 、 Molecular vibration 、 Layered double hydroxides
摘要: We have extended the experimental examination of layered double hydroxides types Mg2Al(OH)6X and Mg3Al(OH)8X, both as isotropic pellets oriented supported specimens, to cover entire range from 4000 250 cm-1 by use CsI CdTe polyethylene supports compared our results with theoretical expectations. Close inspection group theoretically predicted vibrational modes for these materials shows that formal allowedness, while necessary, is not sufficient spectroscopic intensity. The OH z-translational mode occurs around 700 cm-1, x,y-translations rotation (MOH bend) a broad region 1000 down. hydroxide O−H stretching mode, which suppressed orientation, concentrated at higher end total region. Aged material type reproducible structure 400 when X chloride 1/4ferrocyanide. This weak or absent in freshly prepar...
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