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采用紫外-可见光谱和荧光光谱滴定方法考察了5-p-(4-溴乙氧基)苯基-10,15,20-三苯基锌卟啉和5-p-(4-烟酸乙氧基)苯基-10,15,20-三苯基锌卟啉与咪唑类客体之间的配位反应性质。热力学实验研究结果表明,2种锌卟啉与咪唑类客体之间的轴配反应是按摩尔比1∶1进行的,轴配反应的平衡常数均按K(2-MeIm)>K(N-MeIm)>K(Im)的顺序依次减弱,其中5-p-(4-烟酸乙氧基)苯基-10,15,20-三苯基锌卟啉与2-甲基咪唑间的轴配反应有更大的平衡常数,为5.46×105L/mol。荧光光谱滴定实验显示,随客体浓度的增加,2种主体与咪唑类客体形成的轴配体系均具有荧光猝灭效应。
The effects of 5-p- (4-bromoethoxy) phenyl-10,15,20-triphenyl zinc porphyrin and 5-p- (4-nicotinic acid B) were investigated by UV-Vis and fluorescence spectrometry OXY) Phenyl-10,15,20-triphenyl-Zinc Porphyrin and Imidazole Derivatives. The thermodynamic experimental results show that the axial reaction between the two zinc porphyrins and the imidazole target is carried out at a molar ratio of 1: 1, and the equilibrium constants of the axial reaction are in the range of K (2-MeIm)> K (N- MeIm)> K (Im) in the order in which the axis between 5-p- (4-nicotinic acid ethoxy) phenyl-10,15,20-triphenyl zinc porphyrin and 2-methylimidazole The reaction with a larger equilibrium constant of 5.46 × 105L / mol. Fluorescence titration experiments show that with the increase of guest concentration, both the main body and the imidazole guest axis ligand system has a fluorescence quenching effect.