Spectroscopic characteristics and thermal properties of divalent metal complexes of diclofenac

The spectroscopic characteristics (IR and diffuse reflectance) and the thermal properties (TG. DTG and DSC) of the solid compounds obtained by the reaction of diclofenac (DH) with manganese(II), iron(Il), cobalt(II), nickel(II). copper(II) and zinc(II) are reported and discussed. The complexes agreed with the empirical formula MeD2. (H2O)(x) and the metal ions are co-ordinated through the carboxylate group of the ligand. The furnace atmosphere (N-2 or O-2) greatly influences the thermal decomposition trend of the complexes, less their thermal stability. On the contrary, the initial decomposition temperature depends on the co-ordinated metal ion, especially in the case of iron(II) and copper(II) compounds, which are much less stable than other complexes. (C) 2000 Elsevier Science B.V. All rights reserved.