Radical templation centered around a heterotrisradical tricationic inclusion complex DB•+⊂DAPQT2(•+), assembled from an equimolar mixture of a disubstituted 4,4'-bipyridinium radical cation (DB•+) and an asymmetric cyclophane bisradical dication (DAPQT2(•+)), affords a symmetric [2]catenane (SC·7PF6) and an asymmetric [2]catenane (AC·7PF6) on reaction of the 1:1 complex with diazapyrene and bip...

The title compound, tris-(4,4'-bipyridinium) diarsenoocta-deca-molybdate(VI), (C(10)H(10)N(2))(3)[As(2)Mo(18)O(62)], featuring protonated bipyridine mol-ecules and a classical Dawson-type polyoxo-anion, has been synthesized under hydro-thermal conditions. The polyoxoanions are linked together via the bipyridyl cations, acting as hydrogen-bond donors, generating a two-dimensional supra-molecular...

In the structure of the title compound, C(10)H(10)N(2) (2+)·2ClO(4) (-)·4C(7)H(7)NO(2)·2C(10)H(8)N(2)·2H(2)O, the 4,4'-bipyridinium cation has a crystallographically imposed centre of symmetry. The cation is linked by N-H⋯N hydrogen bonds to adjacent 4,4'-bipyridine mol-ecules, which in turn inter-act via O-H⋯N hydrogen bonds with 4-amino-benzoic acid mol-ecules, forming chains running parallel...

A synthetic approach to the preparation of [2]rotaxanes (1-5·6PF(6)) incorporating bispyridinium derivatives and two 1,5-dioxynaphthalene (DNP) units situated in the rod portions of their dumbbell components that are encircled by a single cyclobis(paraquat-p-phenylene) tetracationic (CBPQT(4+)) ring has been developed. Since the π-electron-deficient bispyridinium units are introduced into the d...

The title compound, C(10)H(10)N(2) (2+)·C(10)H(8)O(4) (2-), has inversion centres located at the geometric centres of the 1,4-phenyl-enediacetate anion and 4,4'-bipyridinium cation. The anions and cations are connected by N-H⋯O hydrogen bonds, forming one-dimensional supra-molecular chains, which inter-act with each other via π-π inter-actions [centroid-centroid distance = 3.938 (2) Å], buildin...

Shyam K. Singh and Lindsay A. Summers* Department of Chemistry. The University of Newcastle, N.S.W. 2308. Australia Larry A. Hick Department of Chemistry. The University of Wollongong. N.S.W. 2500. Australia Z. Naturforsch. 43b, 778-784 (1988); received November 12. 1987 3,3'-Bipyridinium Quaternary Salts, Fast Atom Bombardment Mass Spectra, Reduction Potentials Reaction of 3,3'-bipyridine with...