title: Synthesis, characterization, DFT studies and catalytic activities of manganese(II) complex with 1,4-bis(2,2':6,2''-terpyridin-4'-yl) benzene.
abstract: A new di-manganese complex with "back-to-back" 1,4-bis(2,2':6,2''-terpyridin-4'-yl) benzene ligation has been synthesized and characterised by a variety of techniques. The back-to-back ligation presents a novel new mononuclear manganese catalytic centre that functions as a heterogeneous catalysis for the evolution of oxygen in the presence of an exogenous oxidant. We discuss the synthesis and spectroscopic characterizations of this complex and propose a mechanism for oxygen evolution activity of the compound in the presence of oxone. The di-manganese complex also shows efficient and selective catalytic oxidation of sulfides in the presence of H(2)O(2). Density functional theory calculations were used to assess the structural optimization of the complex and a proposed reaction pathway with oxone. The calculations show that middle benzene ring is distorted respect to both of metallic centers, and this in turn leads to negligible resonance of electrons between two sides of complex. The calculations also indicate the unpaired electron located on oxyl-ligand emphasizes the radical mechanism of water oxidation for the system.
authors.affiliation: Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran. mmnajafpour@iasbs.ac.ir
authors.forename: M M
authors.initials: MM
authors.lastname: Najafpour
authors.forename: W
authors.initials: W
authors.lastname: Hillier
authors.forename: A N
authors.initials: AN
authors.lastname: Shamkhali
authors.forename: M
authors.initials: M
authors.lastname: Amini
authors.forename: K
authors.initials: K
authors.lastname: Beckmann
authors.forename: Z
authors.initials: Z
authors.lastname: Jagličić
authors.forename: M
authors.initials: M
authors.lastname: Jagodič
authors.forename: Peter
authors.initials: P
authors.lastname: Strauch
authors.forename: A Nemati
authors.initials: AN
authors.lastname: Moghaddam
authors.forename: G
authors.initials: G
authors.lastname: Beretta
authors.forename: M
authors.initials: M
authors.lastname: Bagherzadeh
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001555:Benzene Derivatives; D056831:Coordination Complexes; D008345:Manganese; D010100:Oxygen