2-(2-羟基-5-氨苯基)苯并咪唑与氨基卟啉能量转移的研究  

Study on the energy transfer between 2-(2-hydroxy-5-aminophenyl)benzimidazole and amino porphyrin

作　　者：彭文宇 易平贵[1] 陶洪文[1] 李玉茹 李庆 张志于 梅刚 PENG Wenyu;YI Pinggui;TAO Hongwen;LI Yuru;LI Qing;ZHANG Zhiyu;MEI Gang(School of Chemistry and Chemical Engineering,Key Laboratory of Theoretical Organic Chemistry and Functional Molecules of Minstry of Education,Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers,Hunan Province College Key Laboratory of QSAR/QSPR,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China)

机构地区：[1]湖南科技大学化学化工学院,理论有机化学与功能分子教育部重点实验室,精细聚合物可控制备及功能应用湖南省重点实验室,分子构效关系湖南省普通高校重点实验室,湖南湘潭411201

出　　处：《化学研究》2019年第6期586-592,共7页Chemical Research

基　　金：国家自然科学基金(21172066);湖南省教育厅重点科研项目(17A065).

摘　　要：采用紫外光谱法和荧光光谱法研究了二氯甲烷溶液中2-(2-羟基-5-氨基苯基)苯并咪唑(NH2-HBI)和5-(4-氨基)苯基-10,15,20-三苯基卟啉(NH2-TPP)两分子之间的能量转移作用,测定了NH2-HBI与NH2-TPP作用的结合比及能量转移参数.结果表明,在光的激发作用下,形成了以NH2-HBI为能量供体、NH2-TPP为能量受体的荧光共振能量转移(FRET)体系,同时发生了NH2-HBI激发态分子内质子转移(ESIPT)与FRET的耦合作用,NH2-HBI分子的醇式构型与酮式构型的荧光都被部分的猝灭,而NH2-TPP的荧光却明显的增强.两分子形成了1∶1的供体-受体作用分子对,体系的FRET能量转移效率(EFRET)为0.114,临界能量转移距离(R0)为2.293nm,供-受体之间的距离(r)为3.227 nm.The energy transfer between 2-(2-hydroxy-5-aminophenyl)benzimidazole(NH2-HBI)and 5-(4-aminophenyl)phenyl-10,15,20-triphenylporphyrin(NH2-TPP)in dichloromethane solution was studied by UV absorption and fluorescence emission spectroscopy.The binding ratio and energy transfer parameters of NH2-HBI with NH2-TPP were measured.The results showed that the fluorescence resonance energy transfer(FRET)occurs,between which NH2-HBI acts as the energy donor and NH2-TPP as the energy acceptor,and the process of excited-state intramolecular proton transfer(ESIPT)coupled with FRET will be occurred at photoexcitation.It was found that the fluorescence of enol and keto tautomer of NH2-HBI are partially quenched,but the fluorescence of NH2-TPP is significantly enhanced in the FRET process.The results also showed that the binding ratio of NH2-HBI with NH2-TPP is 1∶1,the energy transfer efficiency(EFRET)is 0.114,the critical distance(R0)and the distance(r)between donor and aceptor is respectively 2.293 and 3.227 nm.

关 键 词：荧光光谱 苯并咪唑 卟啉 荧光共振能量转移 激发态分子内质子转移 

分 类 号：O644.1[理学—物理化学]