Hydrogen-bonding interactions between harmane and pyridine in the ground and lowest excited singlet states

被引：33

作者：

Balon, M

Munoz, MA

Guardado, P

Carmona, C

机构：

[1] Depto. de Quim. Física, Facultad de Farmacia, Universidad de Sevilla, Sevilla

[2] Depto. de Quim. Física, Facultad de Farmacia, Universidad de Sevilla

来源：

PHOTOCHEMISTRY AND PHOTOBIOLOGY | 1996年 / 64卷 / 03期

关键词：

D O I：

10.1111/j.1751-1097.1996.tb03101.x

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

A spectroscopic (UV-visible, Fourier transform IR, steady-state and time-resolved fluorescence) study of hydrogen-bonding interactions between harmane (1-methyl-9H-pyrido/3,4-b/indole) and pyridine in the ground and lowest excited singlet state is reported, In low polar and weakly or nonhydrogen-bonding solvents, such as cyclohexane, chloroform, carbon tetrachloride, toluene and benzene, the analysis of the spectroscopic data indicates that harmane and pyridine form 1:1 stoichiometric hydrogen-bonded complexes in both the ground and singlet excited states. The formation constants of the complexes are greater in the excited than in the ground state. Hydrogen-bonding interaction in the excited state is essential for the quenching of the fluorescence of harmane by pyridine. The stabilities of the hydrogen-bonded complexes between harmane and pyridine diminish as the polarity and hydrogen-bonding ability of the solvent increase.

引用

页码：531 / 536

页数：6

共 25 条

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