Molecular Structure - Optical Property Relationships for a Series of Non-Centrosymmetric Two-photon Absorbing Push-Pull Triarylamine Molecules

Author(s):Show less -

Vivas, Marcelo G. ^{[1, 2]} ; Silva, Daniel L. ^{[3, 4]} ; Malinge, Jeremy ^[5] ; Boujtita, Mohammed ^[6] ; Zalesny, Robert ^[7] ; Bartkowiak, Wojciech ^[7] ; Agren, Hans ^[8] ; Canuto, Sylvio ^[3] ; De Boni, Leonardo ^[1] ; Ishow, Elena ^{[5, 6]} ; Mendonca, Cleber R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Alfenas, Inst Ciencia & Tecnol, BR-37715400 Pocos De Caldas, MG - Brazil

^[3] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo - Brazil

^[4] Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, BR-13600970 Araras, SP - Brazil

^[5] ENS Cachan, PPSM UMR CNRS 8531, F-94235 Cachan - France

^[6] Univ Nantes, CEISAM UMR CNRS 6230, F-44322 Nantes - France

^[7] Wroclaw Univ Technol, Inst Phys & Theoret Chem, Theoret Chem Grp, PL-50370 Wroclaw - Poland

^[8] Royal Inst Technol, Sch Biotechnol, Dept Theoret Chem & Biol, SE-10691 Stockholm - Sweden

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 4, MAR 24 2014.
• Web of Science Citations: 30

Abstract

This article reports on a comprehensive study of the two-photon absorption (2PA) properties of six novel push-pull octupolar triarylamine compounds as a function of the nature of the electron-withdrawing groups. These compounds present an octupolar structure consisting of a triarylamine core bearing two 3,39-bis(trifluoromethyl) phenyl arms and a third group with varying electron-withdrawing strength (H < CN < CHO < NO2 < Cyet < Vin). The 2PA cross-sections, measured by using the femtosecond open-aperture Z-scan technique, showed significant enhancement from 45 up to 125 GM for the lowest energy band and from 95 up to 270 GMfor the highest energy band. The results were elucidated based on the large changes in the transition and permanent dipole moments and in terms of (i) EWGstrength, (ii) degree of donor-acceptor charge transfer and (iii) electronic coupling between the arms. The 2PA results were eventually supported and confronted with theoretical DFT calculations of the two-photon transition oscillator strengths. (AU)

• FAPESP's process: 09/11810-8 - Study of solvent effect on the one- and two-photon absorption spectra of conjugated organic molecules.
• Grantee: Daniel Luiz da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication
• Grantee: Cleber Renato Mendonça
• Support Opportunities: Research Projects - Thematic Grants