POLYOL METAL-COMPLEXES .5. STRUCTURE OF (2,2'-BIPYRIDYL-KAPPA-2N,N')[MESO-OXOLANE-3,4-DIOLATO(2-)-KAPPA-2O,O']PALLADIUM(II)6.5-HYDRATE

In the title compound, [Pd(C4H6O3)(C10H8N2)].6.5H2O, an oxolanediolato ligand forms a chelate complex with palladium(II). The dianion is formed by double deprotonation of anhydroerythritol in alkaline aqueous solution. The square-planar [(2,2'-bipyridyl)Pd(C4H6O4)] complex acts as a multiple acceptor in a hydrogen-bond system via its alkoxide and ether O atoms. A special feature of the hydrogen-bond system is a homodromic helix, formed by four of the 6.5 water molecules of the asymmetric unit.