Recognition of Symmetrical Tetramethyl-Substituted Cucurbit[6]uril and 2-(Butane-1,4-diyl) Dibenzimidazolium Dichloride with Spectroscopy
YI Jun-ming1, 2, XUE Sai-feng1, TAO Zhu1*
1. Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China 2. Xingyi Normal University for Nationalities, Xingyi 562400 China
Abstract：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.
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