光谱法研究1-萘酚、2-萘酚与瓜环的包结作用  

Spectroscopic Study the Interaction of Cucurbit[n]urils with 1-Naphthol,2-Naphthol

作　　者：王娅[1] 牟兰[1] 薛赛凤[1] 陶朱[1] 祝黔江[1] 

机构地区：[1]贵州大学理学院

出　　处：《光谱学与光谱分析》2007年第9期1820-1825,共6页Spectroscopy and Spectral Analysis

基　　金：贵州省科技厅人才培养基金项目(20020204);贵州省自然科学基金项目(20052014);国家自然科学基金项目(200261002);贵州省重点项目(20023004);国际科技合作重点项目计划项目(2003DF000030)资助

摘　　要：用荧光光谱、紫外吸收光谱法研究了瓜环与1-萘酚、2-萘酚的相互作用,考察了pH对体系的影响。结果表明,1-萘酚、2-萘酚与六元、七元瓜环都不发生作用,而与八元瓜环发生相互作用,形成物质的量比为1∶1的稳定包结配合物。用荧光法测定1-萘酚、2-萘酚与八元瓜环包结配合物的稳定常数为4.2×104L.mol-1和1.6×104L.mol-1,紫外光谱法测定的稳定常数为4.2×104L.mol-1和5.4×104L.mol-1;在酸性和中性条件下1-萘酚、2-萘酚与八元瓜环发生包结作用,形成稳定包结物,而在强碱性条件下不发生包结作用。Interaction of cucurbit[n]urils with two naphthol isomers and the influence of pH on the interaction were studied by using UV-Vis spectroscopy and fluorescence spectrophotometry.The experimental results revealed that cucurbit[8]urils always forms a 1∶1 complex with the naphthol isomers.However,UV-Vis spectroscopy and fluorescence spectrophotometry method showed no obvious interaction of cucurbit[6]urils and cucurbit[7]urils with naphthol isomers in all pH values.Formation constant of Kf was found to be 4.2×10^4 L·mol^-1,1.6×10^4 L·mol^-1 of 1-naphthol and 2-naphthol with cucurbit[8]urils respectively by using fluorescence spectrophotometry.Formation constant of Kf was found to be 4.2×10^4 L·mol^-1,5.4×10^4 L·mol^-1 of 1-naphthol and 2-naphthol with cucurbit[8]urils respectively by using UV-Vis spectroscopy.There is no interaction between cucurbit[8]urils and the naphthol isomers in strong alkalescent medium.The cucurbit[8]urils could include the guest with a 1∶1 ratio in acid and neutral medium.

关 键 词：瓜环 萘酚 光谱法 包结作用 pH影响 

分 类 号：O657.3[理学—分析化学]