Spectroscopic characteristics and thermal properties of divalent metal complexes of diclofenac

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