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1 2005

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Isomeric forms of Cu(quinoline -2-carboxylate)2.H2O compound: Spectroscopic, and magnetic properties

Żurowska B., Mroziński J.

Materials Science Poland

2005

Vol. 23, No. 3

737--744

Spectroscopic and magnetic data of the compound Cu(2-qic)2 .H2O (1), where 2-qic is quinoline-2-carboxylate in the light of the known X-ray structure were studied. The geometry of CuN2O3 chromophore shows a very distorted five-coordinate stereochemistry intermediate between tetragonal pyramid and trigonal bipyramid resulting from the didentate N,O-bonded two chelate ligands and one water molecule. The crystal structure is stabilized by extended hydrogen-bonding network. Magnetic data reflect the molecular character of the compound with very weak exchange interaction (zJ' = - 0.23 cm-1), transmitted through H-bonds. The physico-chemical properties of 1 are compared with a recently reported forms 2 and 3 of identical stoichiometries Cu(quinoline-2-carboxylate)2.H2O obtained in an unusual oxidative P-dealkylation reaction. The compound 1 was prepared directly from quinaldinic acid.