Author/Authors :
Bouaoud,Yasmina Unite´ de Recherche de Chimie de l’Environnement et Mole´culaire Structurale (CHEMS) - Universite´ Constantine 1, Algeria , Setifi,Zouaoui Unite´ de Recherche de Chimie de l’Environnement et Mole´culaire Structurale (CHEMS) - Universite´ Constantine 1, Algeria , Buvailo, Andrii National Taras Shevchenko University of Kyiv - Department of Chemistry, Ukraine, , Potaskalov, Vadim A. Department of General and Inorganic Chemistry - National Technical University of Ukraine, Ukraine , Merazig, Hocine Unite´ de Recherche de Chimie de l’Environnement et Mole´culaire Structurale (CHEMS) - Universite´ Constantine 1, Algeria , Denes,Georges f Laboratory of Solid State Chemistry and Mo¨ssbauer Spectroscopy - Laboratories for Inorganic Materials - Department of Chemistry and Biochemistry - Concordia University, Canada
Abstract :
The asymmetric unit of the title polymer, [Co2(C3H3O4)2Cl2(H2O)2]n, comprises
one CoII atom, one water molecule, one singly deprotonated malonic acid
molecule (HMal; systematic name 2-carboxyacetate) and one Cl anion. The
CoII atom is octahedrally coordinated by the O atom of a water molecule, by one
terminally bound carboxylate O atom of an HMal anion and by two O atoms of
a chelating HMal anion, as well as by two Cl anions. The Cl anions bridge
two CoII atoms, forming a centrosymmetric Co2Cl2 core. Each malonate ligand is
involved in the formation of six-membered chelate rings involving one CoII
atom of the dinuclear unit and at the same time is coordinating to another CoII
atom of a neighbouring dinuclear unit in a bridging mode. The combination of
chelating and bridging coordination modes leads to the formation of a twodimensional coordination polymer extending parallel to (001). Within a layer,
O—HwaterCl and O—HwaterO hydrogen bonds are present. Adjacent layers
are linked through O—HO C hydrogen bonds involving the carboxylic acid
OH and carbonyl groups.
Keywords :
coordination polymer , crystal structure , malonate , cobalt
