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

• [(C3H7)4N][SnCl5(H2O)]·2H2O compound has been synthesized by evaporation of aqueous solutions in a molar ratio 1:1.
• Differential scanning calorimetric reveals the presence of two anomalies.
• The analysis of the wavenumber positions and half-widths were discussed.
• The analysis of the correlation length was reported and discussed

In this work we report the experimental studies of the structural phase transition in the [(C3H7)4N]SnCl5(H2O)]·2H2O compound by differential scanning calorimetric (DSC) and Raman spectroscopic. The X-ray powder diffraction study of the [(C3H7)4N][SnCl5(H2O)]·2H2O sample at room temperature showed that this compound is monoclinic and has P121/c1 space group. Differential scanning calorimetric disclosed two types of phase transitions in the temperature range 356–376 (T1) K and at 393 K (T2) characterized, by a loss of water molecules and probably a reconstruction of new anionic parts after T2 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 (νs(SnO) + νs(SnCl)), based on an order–disorder model allowed us to obtain information relative to the activation energy and correlation length.

Organic-inorganic [(C3H7)4N][SnCl5(H2O)]·2H2O compound.Figure optionsDownload as PowerPoint slide