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Thermodynamic, Physical, and Structural Characteristics in Layered Hybrid Type (C2H5NH3)2MCl4 (M = 59Co, 63Cu, 65Zn, and 113Cd) Crystals

Analytical Laboratory of Advanced Ferroelectric Crystals and Department of Science Education, Jeonju University, Jeonju 55069, Korea
Molecules 2020, 25(8), 1812; https://doi.org/10.3390/molecules25081812
Received: 29 February 2020 / Revised: 8 April 2020 / Accepted: 14 April 2020 / Published: 15 April 2020
(This article belongs to the Section Materials Chemistry)
The thermal, physical, and molecular dynamics of layered hybrid type (C2H5NH3)2MCl4 (M = 59Co, 63Cu, 65Zn, and 113Cd) crystals were investigated by thermogravimetric analysis (TGA) and magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The temperatures of the onset of partial thermal decomposition were found to depend on the identity of M. In addition, the Bloembergen–Purcell–Pound curves for the 1H spin-lattice relaxation time T in the rotating frames of CH3CH2 and NH3, and for the 13C T of CH3 and CH2 were shown to exhibit minima as a function of the inverse temperature. These results confirmed the rotational motion of 1H and 13C in the C2H5NH3 cation. Finally, the T values and activation energies Ea obtained from the 1H measurements for the H‒Cl···M (M = Zn and Cd) bond in the absence of paramagnetic ions were larger than those obtained for the H‒Cl···M (M = Co and Cu) bond in the presence of paramagnetic ions. Moreover, the Ea value for 13C, which is distant from the M ions, was found to decrease upon increasing the mass of the M ion, unlike in the case of the Ea values for 1H. View Full-Text
Keywords: crystal growth; organic-inorganic hybrid compound; (C2H5NH3)2CoCl4; thermodynamic; MAS NMR crystal growth; organic-inorganic hybrid compound; (C2H5NH3)2CoCl4; thermodynamic; MAS NMR
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MDPI and ACS Style

Lim, A.R. Thermodynamic, Physical, and Structural Characteristics in Layered Hybrid Type (C2H5NH3)2MCl4 (M = 59Co, 63Cu, 65Zn, and 113Cd) Crystals. Molecules 2020, 25, 1812.

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