Nanoscale boomerang-shaped octupolar molecules derived from triphenylbenzene

Jeremie Brunel; Anny Jutand; Isabelle N. Ledoux; Joseph Zyss; Mireille H. Blanchard-Desce

doi:10.1117/12.452065

18 December 2002 Nanoscale boomerang-shaped octupolar molecules derived from triphenylbenzene

Jeremie Brunel, Anny Jutand, Isabelle N. Ledoux, Joseph Zyss, Mireille H. Blanchard-Desce

Proceedings Volume 4798, Linear and Nonlinear Optics of Organic Materials II; (2002) https://doi.org/10.1117/12.452065
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The octupolar framework provides a promising route towards molecular compounds combining enhanced NLO responses and improved nonlinearity-transparency trade-off. In this perspective, we have designed original three-branched boomerang-shaped nanoscale molecules. Their molecular design is based on the grafting of three conjugated blades bearing either an electron-withdrawing or an electron-releasing end group on a triphenylbenzene core which can act as a (weak) donor or acceptor counterpart. We selected oligomeric phenylene-vinylene conjugated rods to allow for efficient charge transfer between the center and the periphery of the molecule while preserving transparency. Based on this strategy, we have prepared homologous nanoscale molecules with size varying between 2 and 5 nm. These molecules exhibit a definite solvatochromic behavior, in consistence with a multidimensional intramolecular charge transfer (MDICT) taking place between the core and the peripheral groups. Large first-order hyperpolarizabilities could be achieved by taking advantage and boosting of the MDICT phenomenon while maintaining wide transparency in the visible region (up to ||β|| = 800 10^-30e.s.u., with λ_max = 377 nm). The superlinear dependence of β on size and their concave shape make elongated analogues attractive candidates for future developments.

Citation Download Citation

Jeremie Brunel, Anny Jutand, Isabelle N. Ledoux, Joseph Zyss, and Mireille H. Blanchard-Desce "Nanoscale boomerang-shaped octupolar molecules derived from triphenylbenzene", Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002); https://doi.org/10.1117/12.452065

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