光谱法考察对称四甲基六元瓜环与二氯化-二(2-苯并咪唑)丁烷的分子识别

Recognition of Symmetrical Tetramethyl-Substituted Cucurbit[6]uril and 2-(Butane-1,4-diyl) Dibenzimidazolium Dichloride with Spectroscopy

以对称四甲基六元瓜环为主体,二氯化-二(2,2’-苯并咪唑)丁烷为客体,采用荧光光谱法和紫外吸收光谱法研究了主客体的相互作用。实验结果表明,主体对客体具有较强的包结识别能力,主客体之间可形成1∶1及2∶1的包结配合物,紫外吸收光谱法测得配合物的包结常数为K(1∶1)=4.79±0.01×104 L.mol-1,K(2∶1)=8.51±0.01×1010 L2.mol-2;荧光光谱法测得配合物的包结常数为K(1∶1)=7.02±0.01×104 L.mol-1,K(2∶1)=2.88±0.01×1010 L2.mol-2,两种方法结果一致。

The molecular inclusions of symmetrical tetramethyl-substituted cucurbit[6]uril and 2-（butane-1,4-diyl）dibenzimidazolium dichloride were investigated by using electronic absorption spectroscopy and fluorescence spectroscopy.The experimental results reveal that the formation of host-guest inclusion complexes between TMeQ[6] and SBB were formed with stoichiometry ratios of 1∶1 and 2∶1,The calculated binding constants are K（1∶1）=（4.79±0.01）×104 L·mol-1 and,K（2∶1）=（8.51±0.01）×1010 L2·mol-2 respectively based on the absorption spectrophotometric analysis,while the calculated binding constants are K（1∶1）=7.02×104 L·mol-1 and K（2∶1）=2.88×1010 L2·mol-2 respectively based on the fluorescence spectroscopy analysis.The values of K are reasonably consistent.