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

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

S. C. Mojumdar and M. Melník

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava

E-mail: uachmoju@savba.sk

Abstract: The thermal decomposition of the complexes Mg(ac)₂ . (Et₂na)₂ . 2H₂O (I), Mg(Cl₃ac)₂ . (Et₂na)₂ . 3H₂O (II), and Cu(Cl₃ac)₂ . (Et₂na)₂. 3H₂O (III) (where ac = CH₃COO^-, Cl₃ac = Cl₃ CHCOO^-, and Et₂na = N,N-diethylnicotinamide) had been investigated in 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 complexometric 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, III, I. The final products of the thermal decomposition were MgO (l and II) and CuO (III). The IR, EPR, and electronic spectral analyses were used. Et₂na is coordinated to Mg(II) and Cu(II) through the nitrogen atom of its heterocyclic ring. EPR data suggest a dimeric structure of compound III.

Full paper in Portable Document Format: 541a1.pdf

Chemical Papers 54 (1) 1–5 (2000)