title: Syntheses and characterization of copper complexes with the ligand 2-aminoethyl(2-pyridylmethyl)-1,2-ethanediamine (apme).
abstract: Copper(I)/(II) complexes with the ligand 2-aminoethyl(2-pyridylmethyl)1,2-ethanediamine (apme, abbreviated as PDT in the literature as well) were prepared and characterized. Crystal structures of the copper(I) complexes, [Cu2(apme)2]X2 (1, 2; X=ClO4, CF3SO3), showed that they are dinuclear, in contrast to the trigonal bipyramidal copper(II) complexes [Cu(apme)Cl]BPh4 (3) and [Cu(apme)(DMF)](BPh4)2 (4). 1 and 2 could be investigated in solution by NMR spectroscopy and 3 and 4 by cyclovoltammetry. From the results of these studies it is clear that in solution equilibria between the dinuclear complexes 1/2 and another species exist, most likely the monomeric [Cu(apme)CH3CN]+. Time-resolved UV/vis spectra at low temperatures allowed the spectroscopic detection of dioxygen adduct complexes as reactive intermediates during the oxidation of 1/2 with dioxygen that seem to play an important role in copper enzymes such as peptidylglycine-alpha-hydroxylating monooxygenase (PHM).
authors.affiliation: Institut für Anorganische und Analytische Chemie, Justus-Liebig-Universität, Giessen, Heinrich-Buff-Ring 58, 35392, Giessen, Germany.
authors.forename: Diana
authors.initials: D
authors.lastname: Utz
authors.forename: Sandra
authors.initials: S
authors.lastname: Kisslinger
authors.forename: Frank
authors.initials: F
authors.lastname: Hampel
authors.forename: Siegfried
authors.initials: S
authors.lastname: Schindler
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D019906:Nuclear Magnetic Resonance, Biomolecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D003300:Copper; D010100:Oxygen