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	EFFECT OF CYCLODEXTRIN INCLUSION COMPLEX-FORMATION ON THE TWISTED INTRAMOLECULAR CHARGE-TRANSFER (TICT) OF THE INCLUDED COMPOUND - THE P-DIMETHYLAMINOBENZOIC ACID-BETA-CYCLODEXTRIN
	JIANG, YB ; Jiang YB(江云宝)
	1995
关键词	TWISTED INTRAMOLECULAR CHARGE TRANSFER DUAL FLUORESCENCE SUPRAMOLECULAR INCLUSION COMPLEX P-DIMETHYLAMINOBENZOIC ACID BETA-CYCLODEXTRIN
英文摘要	The effect of cyclodextrin inclusion complex formation on the twisted intramolecular charge transfer (TICT) of the included compound was examined using the TICT-typical dual fluorescence for the p-dimethylaminobenzoic acid (DMABOA)-beta-cyclodextrin (beta-CD) system in buffered (pH 4.12 and 8.00) and unbuffered (pH 5.06) solutions. The host-to-guest ratio of the DMABOA-beta-CD inclusion complex is evaluated to be 1:1 in the three solutions from an analysis of the fluorescence intensity data by two methods. Enhanced LE (locally excited state) and TICT emissions and I-a/I-b ratio, a blue-shifted TICT fluorescence band and a stronger excitation wavelength dependence of the TICT fluorescence for DMABOA in the beta-CD inclusion complex are observed. The correlation of the I-a/I-b ratio with the medium polarity is opposite in the inclusion complex to that observed in organic solvents. The TICT fluorescence of the DMABOA-beta-CD inclusion complex with DMABOA in the basic form shows a stronger excitation wavelength dependence than that with DMABOA in the acidic form. A decreased pK(a) of DMABOA in the beta-CD inclusion complex is determined. This is taken as evidence that the Me(2)N group of the DMABOA molecule is in the beta-CD cavity. TICT is shown to be viscosity dependent in the cyclodextrin inclusion complex. The dependence of the TICT fluorescence of DMABOA in the inclusion complex on the polarity, viscosity and excitation wavelength is discussed in detail with regard to the dynamic scheme of the TICT model and the structural characteristics of the ground and excited states.
语种	英语
出版者	ELSEVIER SCIENCE SA LAUSANNE
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1016/1010-6030(95)04044-G]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	JIANG, YB,Jiang YB. EFFECT OF CYCLODEXTRIN INCLUSION COMPLEX-FORMATION ON THE TWISTED INTRAMOLECULAR CHARGE-TRANSFER (TICT) OF THE INCLUDED COMPOUND - THE P-DIMETHYLAMINOBENZOIC ACID-BETA-CYCLODEXTRIN[J],1995.
APA	JIANG, YB,&江云宝.(1995).EFFECT OF CYCLODEXTRIN INCLUSION COMPLEX-FORMATION ON THE TWISTED INTRAMOLECULAR CHARGE-TRANSFER (TICT) OF THE INCLUDED COMPOUND - THE P-DIMETHYLAMINOBENZOIC ACID-BETA-CYCLODEXTRIN..
MLA	JIANG, YB,et al."EFFECT OF CYCLODEXTRIN INCLUSION COMPLEX-FORMATION ON THE TWISTED INTRAMOLECULAR CHARGE-TRANSFER (TICT) OF THE INCLUDED COMPOUND - THE P-DIMETHYLAMINOBENZOIC ACID-BETA-CYCLODEXTRIN".(1995).

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