六甲基六元瓜环与紫精衍生物作用体系及其除草活性研究

摘要

以紫精衍生物为研究对象,利用核磁共振技术、紫外吸收光谱和循环伏安法等方法,发现六甲基六元瓜环包结了紫精衍生物的烷基部分,形成2∶1比例的哑铃型包结配合物.结果表明,随着紫精衍生物烷基链的增长,紫精衍生物对杂草的除草活性依次减弱,且六甲基六元瓜环可增强紫精衍生物的除草活性.%Six methyl substituted Cucurbit[6]uril (HMeQ[6]) was selected as a host while 4,4'-bypyridyl derivatives (PCn) were selected as guests, and the interaction between HMeQ [6] and PCn was analyzed by 'H NMR, electronic absorption spectroscopy and cyclic voltammetry methods. The results revealed that HMeQ [n]s included the alkyl moieties of PCn and formed dumbbell like inclusion complexes at the ratio of 1:2. The experiments for weeding activity of PCn and HMeQ[6]—PCn revealed the increase of alkyl moieties of PCn had an adverse contribution on its weeding activity. It was suggested that HMeQ[6] played the role of asynergistic agent in this process.