Thermal studies of metalloporphyrins with metals in different oxidation states

Abstract

A precursor of non-aqueous porphyrins such as tetraphenyl porphyrin was synthesized and metallated with Ag, Mn and Sn to get respective metalloporphyrins. Further, they were characterized by UV-Vis spectroscopy, IR spectroscopy and proton NMR. Thermal studies of the above compounds were carried out using thermal analyser in synthetic air from room temperature to 800 degrees C. This analysis revealed that these compounds have thermal stabilities up to 400 degrees C and therefore can be successfully employed as heterogeneous catalysts as well as in semiconductor devices. In tin metalloporphyrin two Cl ligands, one above and other below the porphinato plane is comparatively stabilizing the structure to more symmetrical one which is responsible for more thermal stability. Further, residues of these compounds obtained after heating up to 800 degrees C, showed the presence of metal oxides and coal, respectively.