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• W2086155504 abstract "Abstract The binding mode of coumarin-3-carboxylic acid (HCCA) to La(III) is elucidated at experimental and theoretical level. The complexation ability of the deprotonated ligand (CCA−) to La(III) is studied using elemental analysis, DTA and TGA data as well as FTIR, 1H NMR and 13C NMR spectra. The experimental data suggest the complex formula La(CCA)2(NO3)(H2O)2. B3LYP, BHLYP, B3P86, B3PW91, PW91P86 and MPW1PW91 functionals are tested for geometry and frequency calculations of the neutral ligand and all of them show bond length deviations bellow 1%. B3LYP/6-31G(d) level combined with large quasi-relativistic effective core potential for lanthanum is selected to describe the molecular, electronic and vibrational structures as well as the conformational behavior of HCCA, CCA− and La–CCA complex. The metal–ligand binding mode is predicted through molecular modeling and energy estimation of different La–CCA structures. The calculated atomic charges and the bonding orbital polarizations point to strong ionic metal–ligand bonding in La–CCA complex and insignificant donor acceptor interaction. Detailed vibrational analysis of HCCA, CCA− and La(CCA)2(NO3)(H2O)2 systems based on both calculated and experimental frequencies confirms the suggested metal–ligand binding mode." @default.
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• W2086155504 date "2006-09-01" @default.
• W2086155504 modified "2023-10-16" @default.
• W2086155504 title "DFT modeling and spectroscopic study of metal–ligand bonding in La(III) complex of coumarin-3-carboxylic acid" @default.
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• W2086155504 doi "https://doi.org/10.1016/j.chemphys.2006.04.009" @default.
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