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.
Publisher
Amer Scientific Publishers
Issue Date
2008-09
Language
English
Article Type
Article; Proceedings Paper
Keywords

CHROMOPHORES; OLIGOMERS

Citation

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.8, no.9, pp.4793 - 4796

ISSN
1533-4880
URI
http://hdl.handle.net/10203/93089
Appears in Collection
CH-Journal Papers(저널논문)
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