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- W2000224424 abstract "The FT-IR and FT-Raman vibrational spectra of ninhydrin have been recorded in the range 4000–400 cm−1and 3600–50 cm−1, respectively. A detailed vibrational spectral analysis has been carried out and assignments of the observed fundamental bands have been proposed on the basis of peak positions and relative intensities. The optimized molecular geometry, vibrational frequencies, atomic charges, dipole moment, rotational constants and several thermodynamic parameters in the ground state are calculated using ab initio HF and density functional B3LYP methods with 6-311++G(d,p) basis set combination. In order to find the most optimized geometry, the energy calculations are carried out for various possible conformers. Keto and enol forms of ninhydrin are also studied. The condensed summary of the principal NBOs shows the occupancy, orbital energy and the qualitative pattern of delocalization interactions of ninhydrin. The calculated HOMO–LUMO energies reveal that charge transfer occurs within the molecule. The predicted first hyperpolarizability also shows that the ninhydrin molecule have good optical quality and nonlinear optical (NLO) behavior. With the help of specific scaling procedures, the observed vibrational wave numbers in FT-IR and FT-Raman spectra are analyzed and assigned to different normal modes of the molecule." @default.
- W2000224424 created "2016-06-24" @default.
- W2000224424 creator A5034381389 @default.
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- W2000224424 date "2013-03-01" @default.
- W2000224424 modified "2023-09-30" @default.
- W2000224424 title "Molecular structure, vibrational spectral analysis, NBO, HOMO–LUMO and conformational studies of ninhydrin" @default.
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- W2000224424 doi "https://doi.org/10.1016/j.saa.2012.11.057" @default.
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