Photophysical studies on the mono- and dichromophoric hemicyanine dyes   II. Solvent effects and dynamic fluorescence spectra study in chloroform   and in LB films

doi:10.1021/jp020877f

CORC > 北京大学 > 化学与分子工程学院

	Photophysical studies on the mono- and dichromophoric hemicyanine dyes II. Solvent effects and dynamic fluorescence spectra study in chloroform and in LB films
	Huang, YY ; Cheng, TR ; Li, FY ; Luo, CP ; Huang, CH ; Cai, ZG ; Zeng, XR ; Zhou, JY
刊名	journal of physical chemistry b
	2002
关键词	INTRAMOLECULAR CHARGE-TRANSFER LANGMUIR-BLODGETT-FILMS 2ND-HARMONIC GENERATION SOLVATION DYNAMICS ELECTRON-TRANSFER EXCITED-STATE BICHROMOPHORES EMISSION POLARITY BEHAVIOR
DOI	10.1021/jp020877f
英文摘要	A series of hemicyanine dimers, (B3, B5, and B12) whose two chromophores are linked by different numbers of methylene groups, are synthesized. Negative slovatochromic behaviors are observed, and the fluorescence quantum yield is sensitive to the polarity of solvent. In chloroform, the fluorescence intensity is much more intensive than in other polar solvents, and the decay lifetime is much longer. This fluorescence sensitivity to solvent is due to the twisted intramolecular charge transfer (TICT) state formation, which can be blocked in weak polar solvent. The two chromophores in one dimer molecule are correlated and the TICT formation of dimer is relatively difficult compared with monomer. When the linkage is long enough, this correlation can be reduced. The dynamic fluorescence spectra of the chloroform solutions of these dyes support our assumption. The time-resolved fluorescence studies of their LB films provide a new perspective on the excited-state deactive process. The two-dimensional Forster energy transfer between the chromphores within monolayer is assumed to play an important role of their excited states in these LB samples. The difference of the proportions of energy transfer is supposed to be the responsible for the difference of their photoetectro conversion efficiencies.; Chemistry, Physical; SCI(E); EI; 75; ARTICLE; 39; 10031-10040; 106
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/258000]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Huang, YY,Cheng, TR,Li, FY,et al. Photophysical studies on the mono- and dichromophoric hemicyanine dyes II. Solvent effects and dynamic fluorescence spectra study in chloroform and in LB films[J]. journal of physical chemistry b,2002.
APA	Huang, YY.,Cheng, TR.,Li, FY.,Luo, CP.,Huang, CH.,...&Zhou, JY.(2002).Photophysical studies on the mono- and dichromophoric hemicyanine dyes II. Solvent effects and dynamic fluorescence spectra study in chloroform and in LB films.journal of physical chemistry b.
MLA	Huang, YY,et al."Photophysical studies on the mono- and dichromophoric hemicyanine dyes II. Solvent effects and dynamic fluorescence spectra study in chloroform and in LB films".journal of physical chemistry b (2002).