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) x 10(4) L x mol(-1) and, K(2 : 1) = (8.51 +/- 0.01) x 10(10) L2 x mol(-2) respectively based on the absorption spectrophotometric analysis, while the calculated binding constants are K(1 : 1) = 7.02 x 10(4) L x mol(-1) and K(2 : 1) = 2. 88 x 10(10) L2 x mol(-2) respectively based on the fluorescence spectroscopy analysis. The values of K are reasonably consistent.
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