Abstract

The nonlinear optical and excited state dynamics of a branched octupolar molecule (tris-4,4’,4”-(4- nitrophenilethynyl)triphenylamine(T-NPTPA)) with charge transfer character is investigated by combining measurements of two-photon absorption, time-resolved fluorescence, transient absorption, and three-pulse photon echo peak shift. The data are compared with those obtained for the linear molecule dimethylnitroaminotolane (DMNAT) representing a linear building block of the octupolar system. The purpose of this investigation is to understand the mechanism of the enhanced nonlinear optical properties of the trimer system relative to their linear analogs.

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