Enhanced emission and two-photon absorption cross-section by nanoaggregation of a cyano-substituted stilbene derivative.
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.
Park
Jin Sun
JS
Department of Advanced Materials, Hannam University, Daejeon 305-811, Korea.
Kim
Ran Hee
RH
Cho
Nam Sung
NS
Shim
Hong-Ku
HK
Lee
Kwang-Sup
KS
D000042:Absorption; D002627:Chemistry, Physical; D004126:Dimethylformamide / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010777:Photochemistry / Q000379:methods*; D017785:Photons; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013267:Stilbenes / Q000737:chemistry*
D013267:Stilbenes; D004126:Dimethylformamide