Analysis of the Distribution of Energy Barriers in Amorphous Diazepam on the Basis of Computationally Supported NMR Relaxation Data

Publish Year: 2016
Publisher:  J. Phys. Chem. B., 2016, 120, 10723-10728
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A. Pajzderska, M. Jarek, J. Mielcarek, J. Wąsicki
Crystalline and amorphous diazepam, a psychoactive drug, were investigated by employing spin-lattice relaxation 1H NMR along with atom–atom calculations of the landscape of energy barriers. The activation barriers for reorientation of the methyl group in amorphous diazepam were found to be in the range of 1.9–12.7 kJ/mol. Atom–atom calculations permitted determination of the distribution of energy barriers for reorientations of methyl groups, which was in a good agreement with that obtained on the basis of experimental data. The NMR relaxation combined with calculations provided a quantitative description of the distribution of energy barriers including intra- and inter-molecular interactions

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