ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Thermal Stability and Spectral Properties of Pyrazine-2,3-dicarboxylatocopper(II) Complexes with Ronicol

S. C. Mojumdar, K. Lebrušková, and D. Valigura

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-845 36 Bratislava

E-mail: scmojumdar@hotmail.com

Received: 5 February 2002

Abstract: This paper reports an investigation of thermal and spectral properties of the complexes Cu(2,3- pdc)•1/2H2O (I), Cu(2,3-Hpdc)₂•2H₂O (II), and Cu(2,3-Hpdc)₂(ron)₂ (III) (where 2,3-Hpdc = monoanion and 2,3-pdc = dianion of pyrazine-2,3-dicarboxylic acid and ron = ronicol (3- pyridylmethanol)). TG, DTG, DTA, IR, and electronic spectra have been applied to investigate thermal and spectral properties of these complexes. The chemical composition of the complexes, the solid intermediates, and the resultant products of thermolysis have been identified by means of elemental analysis and complexometric titration. Schemes of destruction of these complexes are suggested. Heating of these compounds first resulted in a release of water molecules. The thermal stability of these complexes increases in the sequence: I, II, III. The final product of the thermal decomposition was CuO in all cases. IR data suggested a unidentate coordination of carboxylates to Cu(II) in complexes I—III.

Full paper in Portable Document Format: 574a245.pdf

Chemical Papers 57 (4) 245–249 (2003)