Preparation, Thermal, and Physical Properties of Perovskite-Type (C 3 H 7 NH 3 ) 2 CdCl 4 Crystals

To investigate the thermal and physical properties of perovskite-type (C₃H₇NH₃)₂CdCl₄, its temperature-dependent chemical shifts and spin⁻lattice relaxation times are measured using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), magic angle spinning nuclear magnetic resonance (MAS NMR), and static NMR methods. Above 300 K, two phase transitions are observed at 398 K and 538 K. Each proton and carbon in the (C₃H₇NH₃) cation is distinguished in the MAS NMR results. The environments around ¹H, ¹³C, and ¹⁴N do not change with temperature according to the NMR spectra. In contrast, the resonance frequency of ¹¹³Cd in the CdCl₆ octahedra decreases with increasing temperature, indicating an environmental change. The uniaxial rotations for ¹H and ¹³C have high mobility at both high and low temperatures, and these are related to the phase transitions. In addition, the molecular motion of ¹¹³Cd in the anion becomes activated upon raising the temperature.

Abstract licence: CC BY

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