Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep04447
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Funding
- FAPESP (Fundacao de Amparo a Pesquisa do estado de Sao Paulo) [2011/12399-0, 2009/11810-8]
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Air Force Office of Scientific Research [FA9550-12-1-0028]
- Swedish Infrastructure Committee (SNIC) for the Project Multiphysics Modeling ofMolecularMaterials'' [SNIC 025/12-38]
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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.
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