The design of second-order nonlinear optical chromophores exhibiting blue-shifted absorption and large nonlinearities: the role of the combined conjugation bridgeElectronic supplementary information (ESI) available: synthesis and structural characterization of several new compounds of this work. See http://www.rsc.org/suppdata/cc/b0/b007653h/

Abstract

Two new extended chromophoric systems, in which a 4-aminoazobenzene moiety is linked to a cyclo-bridged hexatriene electron withdrawing group, have been synthesized, and show large optical nonlinearities and unexpected blue-shifted absorption in comparison with shorter chain analogues.