Abstract
ABSTRACTA series of bipyridinium guests have been synthesised, and their inclusion complexes with acyclic CB[n]-type receptor have been investigated by NMR, UV-Vis spectroscopy, and X-ray diffraction. Novel [3]pseudorotaxane was formed by C-H … O, π-π and ion–dipole interactions. The impact of their complexation on the equilibrium between monomer and dimer of bipyridinium cation radicals has also been studied by UV-Vis-NIR and EPR spectroscopy. Upon reduction, the bipyridinium units linked by flexible pentylene chain preferred the formation of the dimer in the presence of acyclic CB[n]-type receptor, whereas those connected by rigid xylene bridge were suppressed as monomeric form due to the steric effect.
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