Abstract
A theoretical study of L-proline-nH2O (n = 1–3) has been performed using the hybrid DFT-B3LYP and MP2 methods together with the 6-311++G(d,p) basis set. The results show that the P2 conformer is energetically favorable when forming a hydrated structure, and the hydration of the carboxyl group leads to the greatest stability. For hydrated complexes, the adiabatic and vertical singlet–triplet excitation energies tend to decrease with the addition of water molecules. The hydration energy indicates that in the hydrated complexes the order of stability is: binding site 2 > binding site 1 > binding site 3, and binding site 12 > binding site 23 > binding site 13. As water molecules are added, the stabilities of these hydrated structures gradually increase. In addition, an infrared frequency analysis indicated that there are some differences in the low-frequency range, which are mainly dominated by the O–H stretching or bending vibrations of different water molecules. All of these results should aid our understanding of molecular behavior and provide reference data for further studies of biological systems.
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This work was financially supported from the start-up fund (No.08YKZ010) of the Weinan Teachers University of China.
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Xiao-Jun Li and Zhi-Jian Zhong contributed equally to this work.
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Li, XJ., Zhong, ZJ. & Wu, HZ. DFT and MP2 investigations of L-proline and its hydrated complexes. J Mol Model 17, 2623–2630 (2011). https://doi.org/10.1007/s00894-011-0957-z
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DOI: https://doi.org/10.1007/s00894-011-0957-z