Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy.
Chemistry. 2010 Mar 15;16(11):3467-75. doi: 10.1002/chem.200903049.
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.
杯[6]芳烃轮 CX 与基于二氮杂菲的轴 1.2PF(6)在 CH(2)Cl(2)溶液中形成假轮烷物种。大环组件是一种杂双位受体，它可以在其腔体内络合轴的电子受体部分和带有尿嘧啶基团的上边缘的抗衡离子。自组装超分子物种是一种复杂的结构，涉及三个组件——轮、轴及其抗衡离子——它们可以相互作用和影响。所得超分子配合物的化学计量取决于抗衡离子的性质和浓度。也就是说，在稀溶液中和低配位阴离子中，轴带有两个轮，而在高配位阴离子或浓溶液中，该配合物具有 1:1 的化学计量。
