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Proceedings Paper

Nanoscale boomerang-shaped octupolar molecules derived from triphenylbenzene
Author(s): Jeremie Brunel; Anny Jutand; Isabelle N. Ledoux; Joseph Zyss; Mireille H. Blanchard-Desce
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Paper 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 10-30 e.s.u., with λmax = 377 nm). The superlinear dependence of β on size and their concave shape make elongated analogues attractive candidates for future developments.

Paper Details

Date Published: 18 December 2002
PDF: 8 pages
Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002);
Show Author Affiliations
Jeremie Brunel, Ecole Normale Superieure Paris (France)
Anny Jutand, Ecole Normale Superieure Paris (France)
Isabelle N. Ledoux, Ecole Normale Superieure de Cachan (France)
Joseph Zyss, Ecole Normale Superieure de Cachan (France)
Mireille H. Blanchard-Desce, Univ. de Rennes I (France)

Published in SPIE Proceedings Vol. 4798:
Linear and Nonlinear Optics of Organic Materials II
Manfred Eich; Mark G. Kuzyk, Editor(s)

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