Some Mn^III-porphyrins with de-polymerization activity toward humic acid

Abstract

Four Mn^III-porphyrin complexes, chloro(tetraphenylporphinato)Mn^III(1,6-diaminohexane), bromo(tetraphenylporphinato)Mn^III(1,6-diaminohexane), azido(tetraphenylporphinato)Mn^III(1,6-diaminohexane), and thiocyanato(tetraphenylporphinato)Mn^III(1,6-diaminohexane), have been synthesized. These complexes have been characterized using UV-Vis, IR, ESI-mass spectra, elemental analyses, magnetic susceptibility measurements, and conductivity measurement. The molar conductance values of these complexes in ethanol indicate non-electrolytes. The utility of these complexes in de-polymerization of coal using humic acid as the coal model has been tested by the optical density method.

Keywords:

• Mn^III porphyrins
• 1,6-Diaminohexane
• Humic acid
• De-polymerization activity
• Optical density method

Acknowledgments

Shashi Lata Bharati is grateful to the Department of Chemistry, DDU Gorakhpur University, Gorakhpur for the award of a UGC-DSA fellowship. The academic support of Prof. V.K. Yadav and Prof. S.S. Manoharan, Department of Chemistry, IIT Kanpur, for recording ESI-mass spectra and magnetic susceptibility measurements, respectively, is gratefully acknowledged.