title: Syntheses, spectral, electrochemical and thermal studies of mononuclear manganese(III) complexes with ligands derived from 1,2-propanediamine and 2-hydroxy-3 or 5-methoxybenzaldehyde: self-assembled monolayer formation on nanostructure zinc oxide thin film.
abstract: Mononuclear Mn(III) complexes have been prepared via the Mn(II) reaction of an equimolar of Schiff-bases derived from reaction of 2-hydroxy-3-methoxybenzaldehyde or 2-hydroxy-5-methoxybenzaldehyde with 1,2-diaminopropane. Axial ligands L include: pyridine (py) and H(2)O. The resulting complexes have been characterized by FT-IR and UV-vis spectroscopy. The crystal structures of the complexes were determined and indicate that in the solid state the complex adopts a slightly distorted octahedral environment of the imine N and hydroxo O with the two axial ligands. The electrochemical reduction of these complexes at a glassy carbon electrode in acetonitrile solution indicates that the first reduction process corresponding to Mn(III)-Mn(II) is electrochemically quasi-reversible. Thermal stability of these complexes was determined by TG and DTG. Layers of these complexes were formed on nanostructure zinc oxide thin film and a red shift was observed when zinc oxide thin film is modified by complex.
authors.affiliation: Department of Chemistry, University of Isfahan, Isfahan, 81746-73441 I.R. Iran. habibi@chem.ui.ac.ir
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Habibi
authors.forename: Elham
authors.initials: E
authors.lastname: Askari
authors.forename: Mehdi
authors.initials: M
authors.lastname: Amirnasr
authors.forename: Ahmad
authors.initials: A
authors.lastname: Amiri
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yamane
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Suzuki
mesh_terms: D001547:Benzaldehydes / Q000138:chemical synthesis / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003959:Diamines / Q000138:chemical synthesis / Q000737:chemistry*; D055664:Electrochemical Techniques; D008024:Ligands; D008345:Manganese / Q000737:chemistry*; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013057:Spectrum Analysis; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: C561526:2-hydroxy-5-methoxybenzaldehyde; D001547:Benzaldehydes; D056831:Coordination Complexes; D003959:Diamines; D008024:Ligands; C060843:2-vanillin; D008345:Manganese; C070006:1,2-diaminopropane; D015034:Zinc Oxide