Tumbling motions of NH2(CH3)2 ions in [NH2(CH3)2]2ZnCl4 studied using 1H MAS NMR and 13C CP/MAS NMR |
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| Affiliation: | 1. Department of Carbon Fusion Engineering, Jeonju University, Jeonju 560-759, South Korea;2. Department of Science Education, Jeonju University, Jeonju 560-759, South Korea;1. Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan;2. Department of Chemistry, Vietnam National University, Hanoi 10000, Viet Nam;1. Centre of Biotechnology, Anna University, Chennai, India;2. Indian Institute of Scientific and Educational Research, Mohali, India;1. Department of Chemistry, Ivano-Frankivsk National Medical University, Galytska St. 2, 76018 Ivano-Frankivsk, Ukraine;2. Częstochowa Jan Długosz University, Institute of Chemistry, Environmental Protection and Biotechnology, al. Armii Krajowej 13/15, 42200 Cze˛stochowa, Poland;3. Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodiya St. 6, 79005 Lviv, Ukraine |
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| Abstract: | 
The structure and the phase transition temperatures of [NH2(CH3)2]2ZnCl4 were determined using X-ray diffraction and DSC, respectively. The temperature dependence of chemical shifts and the spin–lattice relaxation time T1ρ in the rotating frame were measured for the 1H and 13C nuclei in [NH2(CH3)2]2ZnCl4. From these results, it was observed that the structural change by chemical shifts does not occur with temperature. However, T1ρ for 1H and 13C in [NH2(CH3)2]2ZnCl4 showed a minimum, and it is apparent that both T1ρ values are governed by the same tumbling motions. The activation energies of tumbling motions for 1H and 13C are nearly the same owing to the connection between CH3 and NH2 ions in the [NH2(CH3)2]+ group. |
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| Keywords: | MAS NMR Molecular motion Phase transition Crystal growth |
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