Photophysical Behavior of Heteroduplexes Formed from Naphthalene Incorporated Foldamers,and Linear Donors and Pyromellitic Diimide Incorporated Foldamers  

作　　者：ZHAO Shu-min GU Hai-ning ZHOU Qi-zhong 

机构地区：[1]Key Laboratory for Molecular Design and Nutrition Engineering of Ningbo, Ningbo Institute of Technology of Zhejiang University, Ningbo 315100, P. R. China [2]Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

出　　处：《Chemical Research in Chinese Universities》2009年第3期317-327,共11页高等学校化学研究（英文版）

基　　金：Supported by the Ministry of Science and Technology of China(No.G2000078101);the National Natural Science Foun-dation of China(No.20172069)

摘　　要：The authors synthesized the electron-rich 1,5-dioxonaphthyl group incorporated foldamers, and linear donors and electron-deficient pyromellitic diimide incorporated foldamers, which were investigated in organic solvents. There is an evident charge transfer process from the donors to the electron-deficient foldamers, due to the donor-acceptor interaction of the heteroduplexes formed from the donors and the electron-deficient foldamers in chloroform, observed by using the ultraviolet（UV） visible method. The charge transfer process of the heteroduplexes depends on the molecular structure（not only the number of 1,5-dioxonaphthyl groups and pyromellitic diimide groups in the heteroduplex, but also the intermolecular double hydrogen bond in the heteroduplex）, the intercalative π-π stacking motif, the initial concentration of heteroduplexes, and the polarity of the solvent. Fortunately, the authors found a critical bumping concentration（CBC） of the donors in acetonitrile or chloroform, which is useful in quantitative research, by using the fluorescence method. The value of CBC depends not only on intramolecular folding and the intramolecular hydrogen bond, but also on intramolecular π-π stacking and the solvent. The electron-deficient foldamers quenched the fluorescence of the donors. Fluorescence quenching depends not only on the number of pyromellitic diimide groups and 1,5-dioxonaphthyl groups in the heteroduplex, but also on the intercalative π-π stacking motif between the donor and the acceptor.The authors synthesized the electron-rich 1,5-dioxonaphthyl group incorporated foldamers, and linear donors and electron-deficient pyromellitic diimide incorporated foldamers, which were investigated in organic solvents. There is an evident charge transfer process from the donors to the electron-deficient foldamers, due to the donor-acceptor interaction of the heteroduplexes formed from the donors and the electron-deficient foldamers in chloroform, observed by using the ultraviolet（UV） visible method. The charge transfer process of the heteroduplexes depends on the molecular structure（not only the number of 1,5-dioxonaphthyl groups and pyromellitic diimide groups in the heteroduplex, but also the intermolecular double hydrogen bond in the heteroduplex）, the intercalative π-π stacking motif, the initial concentration of heteroduplexes, and the polarity of the solvent. Fortunately, the authors found a critical bumping concentration（CBC） of the donors in acetonitrile or chloroform, which is useful in quantitative research, by using the fluorescence method. The value of CBC depends not only on intramolecular folding and the intramolecular hydrogen bond, but also on intramolecular π-π stacking and the solvent. The electron-deficient foldamers quenched the fluorescence of the donors. Fluorescence quenching depends not only on the number of pyromellitic diimide groups and 1,5-dioxonaphthyl groups in the heteroduplex, but also on the intercalative π-π stacking motif between the donor and the acceptor.

关 键 词：HETERODUPLEX Foldarner Linear donor Charge transfer Quench 

分 类 号：O626.21[理学—有机化学] Q754[理学—化学]