Monitoring dehydration of the organic-inorganic [(C3H7)4N][SnCl5(H2O)]·2H2O compound using simultaneous thermal and Raman studies.

Abstract In this work we report the experimental studies of the structural phase transition in the [(C 3 H 7 ) 4 N]SnCl 5 (H 2 O)]·2H 2 O compound by differential scanning calorimetric (DSC) and Raman spectroscopic. The X-ray powder diffraction study of the [(C 3 H 7 ) 4 N][SnCl 5 (H 2 O)]·2H 2 O sample at room temperature showed that this compound is monoclinic and has P 121/ c 1 space group. Differential scanning calorimetric disclosed two types of phase transitions in the temperature range 356–376 (T 1 ) K and at 393 K (T 2 ) characterized, by a loss of water molecules and probably a reconstruction of new anionic parts after T 2 transition. The Raman scattering spectra recorded at various temperatures in the wavenumber range from 100 to 3800 cm − 1 covering the domains of existence of changes in the vicinity of the two phase transitions detected by DSC measurement. A detailed study of the spectral parameters (wave number, reduced intensity and the full width at half maximum) as a function of temperature of a chosen band, associated with (ν s (Sn O) + ν s (Sn Cl)), based on an order–disorder model allowed us to obtain information relative to the activation energy and correlation length.