Synthesis and thermal studies of Mn-II, Cr-III and Fe-III methionine complexes

The resulted complexes produced between Mn-II, Cr-III and Fe-III ions and biological molecules like amino acids play an important role in human life. Mn-II, Cr-III and Fe-III complexes are synthesized with methionine (MIE). These complexes were characterized by elemental analysis, molar conductance, infrared and UV-Vis spectra as well as thermogravimetric analysis (TGA/DTG). The elemental analysis introduce that the chelation ratio between metal ions and free methionine moiety behaves as bidentate ligand forming chelates with 1:2 (metal: ligand) stoichiometry for Mn-II ion and 1:3 for Cr-III and Fe-III ions. The molar conductance measurements of the products in DMSO indicate that the complexes are non-electrolyte nature. The activation energies and other kinetic parameters were calculated from the Coats-Redfern and Horowitz-Metzger equations. {[}Samy M. El-Megharbel and Mohamed Y. El-Sayed. Synthesis and thermal studies of Mn-II, Cr-III and Fe-III methionine complexes. Life Sci J 2012;9(2):1254-1259]. (ISSN: 1097-8135). http://www.lifesciencesite.com. 186