Abstract
Reaction of freshly prepared Zn(OH)2−2 x (CO3) x ·yH2O with fumaric acid in CH3OH/H2O (1:1 v/v) at room temperature afforded [Zn(H2O)4(C4H2O4)]·H2O. An X-ray structure determination indicates that the title compound consists of hydrogen bonded H2O molecules and polymeric chains, , resulting from Zn atoms bridged by bis-monodentate fumarate anions. The Zn atoms are octahedrally coordinated by six oxygen atoms of four aqua ligands and two different fumarate anions with the carboxylato oxygen atoms in cis positions. Supramolecular assembly of the polymeric chains is due to extensive hydrogen bonding interactions. Thermal analysis shows that [Zn(H2O)4(C4H2O4)]·H2O decomposes in two steps upon heating; initial endothermic dehydration over 45–80°C is followed by decomposition of anhydrous zinc fumarate at 360–825°C.
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