Tamer Ö, Şimşek M, Avcı D, Atalay Y. Static/dynamic first and second order hyperpolarizabilities, optimized structures, IR, UV-Vis,
1H and
13C NMR spectra for effective charge transfer compounds: A DFT study.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023;
286:122005. [PMID:
36302281 DOI:
10.1016/j.saa.2022.122005]
[Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/13/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
The effective charge transfer compounds, 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium m-trifluoromethylbenzene-sulfonate (DSMFS) and 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium p-trifluoromethylbenzene-sulfonate (DSPFS), were simulated in terms of geometric structure, IR, UV-Vis, 1H NMR and 13C NMR spectra. UV-vis spectra for both molecules give two peaks at 290 and 436 nm assigned as n-π* and π-π* transitions. The HOMO-LUMO energy gap for DSMFS (2.8174 eV) was calculated as lower than that of DSPFS (4.6649 eV). The detailed frontier molecular orbital analysis also indicated that the intra- and inter-molecular charge transfers occur in DSMFS and DSPFS. The static and dynamic (ω = 532 and 1064 nm) nonlinear optical properties were also investigated by using B3LYP/6-311++G(d,p) level. Static first and second order hyperpolarizabilities (β and γ) of DSMFS were obtained 1.5726 × 10-28 esu and 271.63 × 10-36 esu, and those for DSPFS were obtained as 1.5528 × 10-28 esu and 303.31 × 10-36 esu. The dynamic β and γ were obtained as higher than the static corresponding parameters. However, the increasing wavelength in dynamic NLO calculations led to a decrease in β and γ parameters.
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