Synthesis, FTIR, NMR, Mass spectral, X-ray crystallographic and Thermal Studies of Hg(II) Complex of N, N-dimethylbiguanide

Abstract

Metal chelate of antidiabetic drug is synthesized and characterized by using various spectroscopic tools like elemental analyses, IR, NMR, mass spectra, thermal analyses (TGA) and X-ray powder diffraction techniques. The nonvariation conductometric titration method indicated the ionic nature of the complex and LM2 structure type. Complex was assigned tetrahedral geometry based on the spectral data and was found to have chemical formula [(C4H10N5)(HgCl)2] (Scheme-I). Crystallographic parameters have been calculated from powder X-ray diffraction analysis. The thermal and kinetic behaviour of the complex has been studied using Thermogravimetric analysis, which indicates that water molecules of crystallization together with anions are removed in the first step. Calculation of thermodynamic parameters has been done and their relative thermal stabilities of the complex is also discussed. Thermal stability and activation energy have been calculated by F.C and S.W methods. F.C method and TG curves have been used to determine thermodynamic specification viz. free energy change (ΔF), entropy change (ΔS).