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학술저널
저자정보
Cieslik-Boczula, Katarzyna (Faculty of Chemistry, University of Wroclaw) Burgess, Kevin (Department of Chemistry, Texas A & M University) Li, Lingling (Department of Chemistry, Texas A & M University) Nguyen, Binh (Department of Chemistry, Texas A & M University) Pandey, Lesley (Department of Chemistry, Katholieke Universiteit Leuven) De Borggraeve, Wim M. (Department of Chemistry, Katholieke Universiteit Leuven) Van der Auweraerc, Mark (Department of Chemistry, Katholieke Universiteit Leuven) Boens, Noel (Department of Chemistry, Katholieke Universiteit Leuven)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제7호
발행연도
2009.1
수록면
1,006 - 1,015 (10page)

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The solvatochromic photophysical properties of two fluorescent, cyano-substituted BODIPY dyes-8-(4-bromophenyl)-3,4,4,5-tetracyano-4-bora-3a,4a-diaza-s-indacene (4CN) and 8-(4-bromophenyl)-3,5-dicyano-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (2CN)-have been studied in various solvents by UV-vis spectrophotometry and steady-state and time-resolved fluorometry. These two BODIPY analogues have comparable photophysical properties, implying that displacement of F by CN at boron has a negligible effect. Both compounds have high fluorescence quantum yields $\Phi_f$ (0.65-0.90 for 4CN and 0.63.0.88 for 2CN) in the solvents studied and display mono-exponential fluorescence decay profiles in nonprotic solvents. A new, generalized treatment of the solvent effect based on four mutually independent, empirical solvent scales (dipolarity, polarizability, acidity, and basicity of the medium) indicates that solvent polarizability and, to a lesser degree, solvent (di)polarity are crucial factors causing the solvent-dependent shifts of the UV-vis absorption and fluorescence emission. The rate constants of radiative deactivation ($k_f$) are nearly independent of the nonprotic solvent [$k_f=(1.4{\pm}0.1){\times}10^8s^{-1}$ for 4CN and ($1.5{\pm}0.2){\times}10^8s^{-1}$ for 2CN]. Both compounds undergo a color change in polar aprotic solvents (acetone, acetonitrile, and N,N-dimethylformamide), which can be stopped by addition of $HClO_4$. The kinetics of this color change indicates that the decomposition of these cyano-substituted BODIPY compounds is complex.

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