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Synthesis, Thermal and Spectral Properties of Cu(II) Complexes with N,N-Diethylnicotinamide

S. C. Mojumdar, M. Valko, and M. Melník

Department of Inorganic Chemistry, Faculty of Chemical Technology, Slovak University of Technology, SK-812 31 Bratislava

 

E-mail: mojumdar@cvt.stuba.sk

Abstract: The thermal decomposition of the complexes [Cu(ac)2 .(Et2na)]2 . Et2na 2H2O (I), Cu(Clac)2(Et2na)3 (II), and Cu(Cl2ac)2.(Et2na)2. 2H2O (III) (where ac = CH3COO-, Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, and Et2na = N,N-diethylnicotinamide) had been investigated in static air in the temperature range 20-1000°C by means of thermogravimetry (TG) and differential thermal analysis (DTA). The composition of the complexes and the solid state intermediate and resultant products of thermolysis had been identified by means of elemental analysis and compleximetric titration. The possible scheme of destruction of the complexes is suggested. Heating the compounds first results in a release of water molecules. The loss of the volatile ligand (Et2na) occurs in one step. The thermal stability of the complexes increases in the sequence: II, II I. The final products of the thermal decomposition were CuO. The IR, EPR, and electronic spectral analyses were used. Et(2)na was found to be coordinated to Cu(II) through the nitrogen atom of its heterocyclic ring and EPR data suggest a dimeric structure of compound I and monomeric structure of compounds II and III.

Full paper in Portable Document Format: 525a650.pdf

 

Chemical Papers 52 (5) 650–654 (1998)

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