Switching of emissive and NLO properties in push–pull chromophores with crescent PPV-like structures

Literature Information

Publication Date 2012-11-26
DOI 10.1039/C2CP43140H
Impact Factor 3.676
Authors

Carmine Coluccini, Arvind K. Sharma, Marco Caricato, Angelo Sironi, Elena Cariati, Stefania Righetto, Elisa Tordin, Chiara Botta, Alessandra Forni


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Abstract

We report on a series of novel homologous push–pull compounds, in which identical donor (a dimethylamino) and acceptor (a malonate ester) functionalities endcap crescent PPV fragments, bearing, respectively, 1, 2 and 3 p-phenylenevinylene units in direct linear conjugation (compounds 7–9). The three compounds exhibit striking differences in their linear and nonlinear optical properties. The shorter compound 7 exhibits aggregation-induced emission with a strong luminescence in the solid state (blue emission, photoluminescence quantum yield 38%), and it is nonemissive in solution; the more extended conjugated systems 8 and 9 show classical aggregation-caused quenching in the solid state, while high quantum yield photoluminescence (21 and 93% in toluene) is restored in diluted solutions, through mechanisms involving intramolecular charge transfer in the excited states. EFISH measurements in solutions demonstrate a strong solvent and concentration dependence. As rationalized with the aid of molecular modelling, compounds 8 and, more markedly, 9 aggregate in stable centrosymmetric dimers in solution.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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