Physicochemical Property Investigations of Perovskite-Type Layer Crystals [NH(CH) NH]CdCl ( = 2, 3, and 4) as a Function of Length of CH.

Hybrid perovskites have potential applications in several electrochemical devices such as supercapacitors, batteries, and fuel cells. Here, the thermal stabilities as a function of the length of the CH groups in [NH(CH) NH]CdCl ( = 2, 3, and 4) crystals were considered by TGA and DTA. The structural characteristics and molecular dynamics were studied by MAS and static NMR experiments. A comparison of spin-lattice relaxation times indicated that the organic cation containing H and C was significantly more flexible than the inorganic anion containing Cd. The flexibility of H increased with an increase in the length of CH in the carbon chain, resulting in a decrease in the activation energy ( ) of H. The of C at = 3 and 4 was more flexible at high temperatures than at low temperatures. In contrast, the of C at = 2 was more flexible at low temperatures. These results provide insight into the thermal stability and molecular dynamics of these crystals as a function of the length of CH groups in the carbon chain and are expected to facilitate applications.