Abstract
Abstract N-Alkyl-4,4′-bipyridiniums [4,4′-bpy-N-(CH2)nOAr]+(Cl−) (n = 6 and 10, Ar = C6H3-3,5-t-Bu2, C6H3-3,5-(OMe)2, and C6H2-2,4,6-Me3), having the cationic bipyridinium group and a long hydrophobic alkyl chain, were prepared from the reaction of 4,4′-bipyridine with the corresponding alkyl chlorides. The amphiphilic compounds in water form micelles which encapsulate added pyrene in the hydrophobic core. Addition of α-cyclodextrin to the micellar solution converts a part of the aggregated amphiphilic molecules to their pseudorotaxane with α-cyclodextrin. Formation of the pseudorotaxanes is favored at lower temperature, as is observed by temperature dependent change of the absorption spectra.
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