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Enhanced Emission and Two-Photon Absorption Cross-Section by Nanoaggregation of a Cyano-Substituted Stilbene Derivative

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This study reports the synthesis and the investigation of optical behaviors of a stilbene derivative, (Z)-2,3-bis[4-(N-4-(diphenylamino)styryl)phenyl]acrylonitrile (StCN). The nanoaggregates of StCN in 50% water/DMF have exhibit an increased fluorescence intensity and a blue shift with emission maximum wavelength with respect to StCN in 100% N,N-dimethylformamide (DMF) solution. This fluorescence enhancement can be attributed to the formation of J-aggregates. The cyano group prevents coplanarization of both arms and intermolecular face-to-face orientation leading to the formation of J-aggregates preventing the solvent relaxation. A strong fluorescence bathochromic solvatochromism is indicative of a large dipole moment in solution. Also, the two-photon absorption cross-section of nanoaggregates has been increased 1.5 times compared to that in DMF solution at the maximum wavelength.
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Document Type: Research Article

Publication date: 2008-09-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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