Thermal and structural properties, and molecular dynamics in organic-inorganic hybrid perovskite (C 2 H 5 NH 3 ) 2 ZnCl 4 .

The thermal and structural properties and molecular dynamics of layered perovskite-type (C ₂ H ₅ NH ₃ ) ₂ ZnCl ₄ are investigated by differential scanning calorimetry, thermogravimetric analysis, and magic angle spinning nuclear magnetic resonance spectroscopy. The thermal properties and phase transitions are studied. Additionally, the Bloembergen-Purcell-Pound (BPP) curves for the ¹ H spin-lattice relaxation time T _1ρ in the C ₂ H ₅ NH ₃ cation and for the ¹³ C T _1ρ in C ₂ H ₅ are shown to have minima as a function of inverse temperature. This observation implies that these curves represent the rotational motions of ¹ H and ¹³ C in the C ₂ H ₅ NH ₃ cation. The activation energies for ¹ H and ¹³ C in the C ₂ H ₅ NH ₃ cation are obtained; the molecular motion of ¹ H is enhanced at the C-end and N-end of the organic cation, and that at the carbons of the main chain is not as free as that for protons at the C-end and N-end.
Competing Interests: There are no conflicts to declare.
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