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A novel NIR violanthrone derivative with high
electron-deficiency: effect of fluorescence on dicyanomethylene substitution |
| Bo LIU1,Duo FAN2,Qiong ZHANG2,Yu CHEN2,Weihong ZHU2, |
| 1.Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of
Science & Technology, Shanghai 200237, China;College of Chemistry
and Material Science, Hebei Normal University, Shijiazhuang 050016,
China; 2.Key Laboratory for Advanced
Materials and Institute of Fine Chemicals, East China University of
Science & Technology, Shanghai 200237, China; |
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Abstract Near infrared (NIR) dyes attracted increasing interests in widely potential applications, such as fluorescent probe and living organism imaging, due to their low background signals from biomolecules, low light scattering and deep penetration, and low-cost excitation light sources. A novel NIR violanthrone derivative (VA-CN) with dicyanomethylene substitution was synthesized and fully characterized by 1H NMR, 13C NMR, HRMS, and IR spectrometry. It is demonstrated that the original planar conformation of violanthrone ring (the nine fused benzene rings) becomes twisted and unsymmetrical upon the incorporation of two strong electron-withdrawing dicyanomethylene units. Photophysical, electrochemical performances as well as distinct solvatochromic effects were studied in detail. Considering the low reduction potential (−0.56 V vs NHE), VA-CN could be considered as a good electron acceptor due to the strong electron deficiency resulted from dicyanomethylene group. A distinct increase in fluorescence was observed with 30-fold enhancement upon the addition of n-butyl amine. The reversible fluorescence “off-on” shows that VA-CN might be served as a promising fluorescent sensor for electron-rich amines.
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| Keywords
violanthrone derivative
dicyanomethylene group
synthesis
NIR fluorescence
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Issue Date: 05 June 2010
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