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

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。

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

The molecular inclusions of symmetrical tetramethyl-substituted cucurbituril 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 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.