Article ID Journal Published Year Pages File Type
1229468 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2015 6 Pages PDF
Abstract

•The phase transition of [N(C3H7)4]2SnCl6 compound has been analyzed by Raman spectroscopy.•The analysis of the wavenumber positions and half-widths have been discussed.•The temperature dependencies of the reduced intensity have been analyzed using order-disorder models.•The analysis of the correlation lengths were reported and discussed.

The phase transition at high temperature of bis-tetrapropylammoniumhexachlorostannate compound has been investigated by Raman spectroscopy as a function of temperature from 303 K to 393 K. While the bands mainly associated with the internal modes of the SnCl6 anions only undergo weak changes, strong evolutions of wavenumbers, widths and intensities of many lines associated with the organic cations are observed with discontinuities in the vicinity of the phase transition at 362 K. The most important changes are observed for two lines at 1137.5 cm−1 and 1159.4 cm−1 (at room temperature) issued from twisting of CH2 groups and skeletal deformation of the cations. The spectral characteristics of these lines are analyzed and consistently described in the framework of an order–disorder model for the phase transition. The temperature dependency of the reduced peak intensity allowed to determine the critical exponents and evolution of the correlation length on approaching the transition.

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Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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