Abstract
AbstractThe new complex [Cd2(bpa)2Cl4]·6 H2O [bpa = N,N'‐bis(picolinamide)azine] has been synthesized in which each bpa ligand is twisted into a spiral‐like conformation and the two CdII ions are ligated by two bpa ligands to form a double‐stranded binuclear helicate. Unprecedented water chains featuring cyclic water tetramers composed of three independent water molecules are trapped by [Cd2(bpa)2Cl4] double helicates by hydrogen bonds. The binuclear chiral helicates are interlinked into homochiral layers by hydrogen bonds with the water tapes. The layers are alternately stacked in a heterochiral fashion to yield the final racemic structure. The complex shows an endotherm at 65.7 °C in the DSC due to loss of water molecules, giving an enthalpy value of 47 kJ mol–1 per water molecule. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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