Abstract
The thermodynamic properties and phase transitions in Rb2[CuBr4]·2H2O are studied through differential scanning calorimetry (DSC), thermogravimetric analysis, and nuclear magnetic resonance (NMR) experiments. The DSC endothermic peaks near 337 and 353 K are accompanied by the partial escape of H2O. The temperature dependence of the NMR resonance frequency, line width, and spin–lattice relaxation time near the transition temperatures are related to variations in the symmetry of the environments of Rb(I) ions. The DSC peaks seem to correspond to a chemical change caused by thermal decomposition, rather than a physical change such as a structural phase transition. The results obtained here are compared to those of Rb2[CuCl4]·2H2O crystal from our previous study.
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