1. Twisted intramolecular charge transfer and its contribution to the NLO activity of Diglycine Picrate: a vibrational spectroscopic study.
- Author
-
Alen S, Sajan D, Umadevi T, Němec I, Baburaj MS, Bena Jothy V, and Selin Joy BH
- Subjects
- Crystallization, Hydrogen Bonding, Molecular Conformation, Spectroscopy, Fourier Transform Infrared, Electrons, Nonlinear Dynamics, Optical Phenomena, Picrates chemistry, Spectrum Analysis, Raman, Vibration
- Abstract
Single crystals of Diglycine Picrate (DGLP) were grown by slow evaporation technique and the vibrational spectral analysis is carried out using FT Raman and FT-IR spectroscopy, supported by Density Functional Theoretical (DFT) computations to derive equilibrium geometry, vibrational wavenumbers and first hyperpolarizability. The vibrational spectra confirm the existence of NH3(+) in DGLP. The influence of Twisted Intramolecular Charge Transfer (TICT) caused by the strong ionic ground state hydrogen bonding between charged species making DGLP crystal to have the non-centrosymmetric structure has been discussed. The Natural Bond Orbital (NBO) analysis confirms the occurrence of strong intermolecular N-H⋯O hydrogen bond. The HOMO-LUMO energy gap and the first order hyperpolarizability were calculated and it supports the nonlinear optical activity of the Diglycine Picrate crystal., (Copyright © 2014 Elsevier B.V. All rights reserved.)
- Published
- 2015
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