Molecular Structure - Optical Property Relationships for a Series of Non-Centrosymmetric Two-photon Absorbing Push-Pull Triarylamine Molecules
2014 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 4, 4447- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 4, 4447- p.
Absorption Cross-Sections, Density-Functional Theory, Organic-Molecules, Photodynamic Therapy, Conjugated Molecules, Femtosecond Laser, Data Storage, Thin-Films, Td-Dft, Chromophores
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-144536DOI: 10.1038/srep04447ISI: 000333239000007ScopusID: 2-s2.0-84906544486OAI: oai:DiVA.org:kth-144536DiVA: diva2:714446
QC 201404282014-04-282014-04-242014-04-28Bibliographically approved