瓜环与苯甲酸和萘的组装及热力学规律  

Laws of thermodynamic and assembly of cucurbiturils with humic acid models

作　　者：杨琴[1] 孟晓荣[1] 杨永利[1] 王文东[2] 

机构地区：[1]西安建筑科技大学化学系,西安710055 [2]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境化学》2013年第9期1680-1686,共7页Environmental Chemistry

基　　金：国家自然科学青年基金项目(21007050);陕西省教育厅专项科研项目(12JK0455);西安市碑林区科技局(GX1205)资助

摘　　要：以苯甲酸和萘分别作为腐殖酸的模型物,通过摩尔比率法和等摩尔系列法,采用紫外吸收和荧光分光技术共同研究了瓜环与苯甲酸及萘的功能组装作用.研究表明:Q[7]与萘可发生组装作用,形成1∶1的组装体Ⅰ.Q[6]及Q[8]与苯甲酸也可以发生组装作用,分别形成1∶1及1∶2的组装体Ⅱ和Ⅲ.热力学计算表明,组装体可自发形成,形成过程放热,组装反应的驱动力是焓变,疏水作用力是反应的主要驱动力.红外光谱对组装体进行了表征,结果表明,瓜环与模型物发生了组装作用.荧光光谱表明,瓜环对模型物具有荧光增敏的作用.The interactions of cucurbituril[6]（Q[6]）and cucurbituril[8]（Q[8]）with benzoic acid and cucurbituril[7]（Q[7]） with naphthalene as model compounds of humic acid were investigated by UV absorption and fluorescence methods. The results showed that the ratio of the assembled complex between Q[6], Q[8] and benzoic acid was 1：1 and 1：2 respectively, whereas Q[7] formed a complex with naphthalene with a ratio of 1：1. The UV spectra indicated that the naphthalene molecule fell into the cavity of Q[7]. The fluorescence spectra showed that Q[6] and Q[8] enhanced the fluorescence of benzoic acid. The thermodynamic data indicated that the assembly process occurred spontaneously and the hydrophobic interaction was the main driving force. Infrared spectra provided additional evidence for the assembly of cucurbituril with the model compounds.

关 键 词：瓜环 组装体 模型物 紫外 荧光 

分 类 号：O614.811[理学—无机化学]