| Texto completo | |
| Autor(es): |
Silva, Daniel L.
[1, 2]
;
Fonseca, Ruben D.
[3]
;
Vivas, Marcelo G.
[4]
;
Ishow, E.
[5]
;
Canuto, Sylvio
[1]
;
Mendonca, Cleber R.
[3]
;
De Boni, Leonardo
[3]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, BR-13600970 Araras, SP - Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[4] Univ Fed Alfenas, Inst Ciencia Tecnol, BR-37715400 Pocos De Caldas, MG - Brazil
[5] Univ Nantes, CEISAM UMR CNRS 6230, F-44322 Nantes - France
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Chemical Physics; v. 142, n. 6 FEB 14 2015. |
| Citações Web of Science: | 13 |
| Resumo | |
This paper reports on the static and dynamic first-order hyperpolarizabilities of a class of push-pull octupolar triarylamine derivatives dissolved in toluene. We have combined hyper-Rayleigh scattering experiment and the coupled perturbed Hartree-Fock method implemented at the Density Functional Theory (DFT) level of theory to determine the static and dynamic (at 1064 nm) first-order hyperpolarizability (beta(HRS)) of nine triarylamine derivatives with distinct electron-withdrawing groups. In four of these derivatives, an azoaromatic unit is inserted and a pronounceable increase of the first-order hyperpolarizability is reported. Based on the theoretical results, the dipolar/octupolar character of the derivatives is determined. By using a polarizable continuum model in combination with the DFT calculations, it was found that although solvated in an aprotic and low dielectric constant solvent, due to solvent-induced polarization and the frequency dispersion effect, the environment substantially affects the first-order hyperpolarizability of all derivatives investigated. This statement is supported due to the solvent effects to be essential for the better agreement between theoretical results and experimental data concerning the dynamic first-order hyperpolarizability of the derivatives. The first-order hyperpolarizability of the derivatives was also modeled using the two- and three-level models, where the relationship between static and dynamic first hyperpolarizabilities is given by a frequency dispersion model. Using this approach, it was verified that the dynamic first hyperpolarizability of the derivatives is satisfactorily reproduced by the two-level model and that, in the case of the derivatives with an azoaromatic unit, the use of a damped few-level model is essential for, considering also the molecular size of such derivatives, a good quantitative agreement between theoretical results and experimental data to be observed. (C) 2015 AIP Publishing LLC. (AU) | |
| Processo FAPESP: | 09/11810-8 - Estudo do efeito de solvente sobre os espectros da absorção de um e dois fótons de moléculas orgânicas conjugadas. |
| Beneficiário: | Daniel Luiz da Silva |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 11/12399-0 - Aplicações de pulsos de femtossegundos em óptica não linear: espectroscopia, formatação de pulsos e microfabricação |
| Beneficiário: | Cleber Renato Mendonça |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |