Synthesis, characterization, crystal structure and oxygen-evolution activity of a manganese(II) complex with 2,4,6-tris (2-pyridyl)-1,3,5-triazine

The title complex [Mn(tptz)(CH3COO)(OH2)(2)]NO3 was synthesized through the reaction of tptz (2 4 6-tris(2-pyridyl)-1 3 5 Mantle) nitric acid and manganese(II) acetate The molecular structure was characterized by X-ray diffraction elemental analysis electrochemistry EPR IR fluorescence and UV-Vis spectroscopy and its oxygen evolving activity has been studied X-ray structure analysis shows that each Mn(II) ion is seven coordinated by a bidentate acetate three nitrogen atoms of tptz and two oxygen atoms from two water ligands which are coordinated in axial positions The complex acts as an oxygen evolving complex with ozone (2KHSO(5) KHSO4 K2SO4) as primary oxidant in aqueous solution with a turnover number of 1 (mol of O-2/mol of the complex) Kinetic studies revealed a first order dependence on the complex and oxidant The EPR spectrum shows that the mononuclear complex oxidize to a Mn-2(III) (IV) di-mu-oxo by oxone (C) 2010 Elsevier Ltd All rights reserved