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NLO properties and spectroscopic characterization of Y-shaped polymer using quantum chemical approach
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  • Mahadevappa Naganathappa,
  • Ajay Chaudhari,
  • Balakrishna Kolli,
  • Sampath Ravula
Mahadevappa Naganathappa
GITAM (Deemed to be University) Hyderabad Campus
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Ajay Chaudhari
The Institute of Science
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Balakrishna Kolli
GITAM University Hyderabad campus
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Sampath Ravula
GITAM Deemed to be University Hyderabad campus
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Abstract

The present study reports nonlinear optical properties such as first and second hyper polarizabilities (β and γ) of Y-shaped polymer (P1) and substituted polymers. The basic Y-shaped polymer (R=R1=H) named as P1. Upon substitution of one OCH3 group in ortho position of Oxygen becomes polymer P2 (R1=H, R=OCH3) and two OCH3 group as P3 (R1=R=OCH3). We have also reported structural parameters, vibrational and electronic absorption spectra of polymer and substituted using quantum chemical methods. The geometrical parameters such as dipole moment, bond length and angles are reported at B3LYP/6-311++g** level of theory. In addition, the vibrational, electronic absorption spectra and NLO properties are also reported at the same level of theory. There is significant change in dipole moment and energy observed whereas symmetry, bond length and angles are resembling in Y-shaped and substituted polymer. The vibrational spectra of Y-shaped polymer (P1) having the intense peak is C-H stretching mode observed at 1258 cm-1. These Theoretical vibrational modes are well matching with available experimental determinations. The method dependent and the along the X, Y and Z-direction hyperpolarizabilites also reported. This study confirms the polymer P1 and P2 showing first and second hyperpolarizability response whereas P3 do not show. The electronic absorption spectra for polymer and substituted polymers are also reported at the same level of theory using (TDDFT) approach. The wavelength of electronic transition, oscillator strength and HOMO-LUMO gap also reported.

Peer review status:UNDER REVIEW

12 May 2020Submitted to International Journal of Quantum Chemistry
13 May 2020Assigned to Editor
13 May 2020Submission Checks Completed
27 May 2020Reviewer(s) Assigned