首页|Spectroscopy and second hyperpolarizability of odd spin states of acetonitrile: Theoretical study

Spectroscopy and second hyperpolarizability of odd spin states of acetonitrile: Theoretical study

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  • NSTL
  • Elsevier
The present study reports the spectroscopic characterization and second hyperpolarizability of odd spin states of acetonitrile in gas phase and water solvent. The odd spin states of acetonitrile are singlet, triplet and quintet spin state of acetonitrile have been considered for the study. The spectroscopic characterization viz. energy, geometrical parameters, infrared and electronic absorption spectra, molecular orbitals (MOs) their energies and natural transitions orbitals (NTOs) in gas phase and water solvent state reported at B3LYP/aug-cc-pVDZ level of theory. The second hyperpolarizability values are obtained using various methods and basis sets for comparison. It has been observed that the second hyperpolarizability values for the odd spin states of acetonitrile are more positive than the first hyperpolarizability. It is clearly seen that the effect of spin on spectroscopic parameters except on energy. The singlet gas phase acetonitrile calculations are well matching with the available experimental determinations. The TDDFT approach has been used to study electronic absorption spectra of all spin states of acetonitrile in gas phase and in water solvent. The IEFPCM model implemented in studying acetonitrile in water solvent at B3LYP/ aug-cc-pVDZ level of theory. It is observed that HOMO to LUMO gap is larger for singlet than the triplet and quintet spin state and it decrease with an increase in strength of an applied field. All these calculations performed using Gaussian 16 program package. (c) 2021 Published by Elsevier B.V.

AcetonitrileVibrational spectraElectronic absorption spectraNLO propertiesmolecular orbitals (MOs)natural transition orbitals (NTOs)Quantum chemical methodsNONLINEAR-OPTICAL PROPERTIESSTRUCTURE-PROPERTY CORRELATIONAB-INITIOLIQUID ACETONITRILE1ST HYPERPOLARIZABILITIESVIBRATIONAL SPECTROSCOPYDIRADICAL CHARACTERSYSTEMSGAMMAFIELD

Kharat, Bhagwat、Naganathappa, Mahadevappa、Jagrut, Vasant、Chaudhari, Ajay

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Swami Vivekanand Senior Coll

GITAM Deemed Univ

Dr Homi Bhabha State Univ

2022

10.1016/j.saa.2021.120389

Spectrochimica acta

Spectrochimica acta

ISSN：1386-1425
年,卷(期)：2022.265
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