Promoting Spontaneous Second Harmonic Generation through Organogelation
mediaposted on 14.07.2016, 00:00 by A. Belén Marco, Fátima Aparicio, Lara Faour, Konstantinos Iliopoulos, Yohann Morille, Magali Allain, Santiago Franco, Raquel Andreu, Bouchta Sahraoui, Denis Gindre, David Canevet, Marc Sallé
An organogelator based on the Disperse Red nonlinear optical chromophore was synthesized according to a simple and efficient three-step procedure. The supramolecular gel organization leads to xerogels which display a spontaneous second harmonic generation (SHG) response without any need for preprocessing, and this SHG activity appears to be stable over several months. These findings, based on an intrinsic structural approach, are supported by favorable intermolecular supramolecular interactions, which promote a locally non-centrosymmetric NLO-active organization. This is in sharp contrast with most materials designed for SHG purposes, which generally require the use of expensive or heavy-to-handle external techniques for managing the dipoles’ alignment.