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

摘要

The molecular inclusions of symmetrical tetramethyl-substituted cucurbit[6]uril and 2-(butane-l,4-diyl)dibenzimid-azolium 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)×1020 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%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.