Abstract
The multiple-ligand-binding of D-penicillamine with [Cu(H2O)6]2+ has been explored computationally using density functional theory (DFT). Because of the implementation of bulk aqueous medium and considering the pH at physiological level, both neutral as well as de-protonated analogues of D-penicillamine are taken into account to study the binding phenomena with Cu2+. In doing so, at first, we have studied the binding of both neutral and de-protonated analogues of two D-penicillamine with Cu2+ in bi-dentate mode by replacing four molecules of H2O (di-amino complex) and afterward, the binding of three D-penicillamine with Cu2+ has been investigated by substituting all six molecules of H2O (tri-amino complex). Apart from bi-dentate binding, the de-protonated form of D-penicillamine can also bind in tri-dentate mode and in that case, all six H2O molecules are substituted during di-amino complex formation. Based on the coordinating modes of the artificial amino acids, for each di- and tri-amino complex, more than one isomer has been detected and the isomers are designated accordingly. By analyzing the optimized geometries, it is noticed that most of the di- and tri-amino complexes are distorted hexa-coordinated in nature and in few cases, they adopt penta-coordinated geometry. To analyze the stability of the complexes, we have determined the binding energy (BE) in both DCM and CDCM mechanisms for each di- and tri-amino complex. Overall, the present study is arranged in such a way so that it can provide a complete understanding about the binding process of the aforementioned artificial amino acid with Cu2+-aqua complex.
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TA and TD are thankful to Indian Association for the Cultivation of Science and AG is thankful to UGC for providing them research fellowships.
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Ash, T., Debnath, T., Ghosh, A. et al. Comprehensive understanding of multiple binding of D-penicillamine with Cu2+-hexa aqua complex: a DFT approach. Struct Chem 31, 155–169 (2020). https://doi.org/10.1007/s11224-019-01365-2
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DOI: https://doi.org/10.1007/s11224-019-01365-2