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Published on: August 2, 2012
Self-assembly of calix[6]arene-diazapyrenium pseudorotaxanes: interplay of molecular recognition and ion-pairing
Monica Semeraro1, Arturo Arduini, Massimo Baroncini
1Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy.
Abstract:
The calix[6]arene wheel CX forms pseudorotaxane species with the diazapyrenium-based axle 1.2PF(6) in CH(2)Cl(2) solution. The macrocyclic component is a heteroditopic receptor, which can complex the electron-acceptor moiety of the axle inside its cavity and the counterions with the ureidic groups on the upper rim. The self-assembled supramolecular species is a complex structure, which involves three components--the wheel, the axle and its counterions--that can mutually interact and affect. The stoichiometry of the resulting supramolecular complex depends on the nature and concentration of the counterions. Namely, it is observed that in dilute solution and with low-coordinating anions the axle takes two wheels, whereas with highly coordinating anions or in concentrated solutions the complex has a 1:1 stoichiometry.
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