Yilma Gultneh

Dioxygen–copper reactivity: a hydroperoxo–dicopper(II) complex

A hydroperoxo–dicopper(II) complex (3) can be prepared by (a) direct protonation of a peroxo–dicopper(II) complex (2), (b) oxygenation of a ligand-protonated form of the dicopper(I) precursor of (2), and (c) reaction of hydrogen peroxide with a hydroxo-bridged dicopper(II) complex (5); (3) reacts quantitatively with triphenylphosphine or tetrahydrothiophene to give (5) and oxygenated products.

Studies on a model copper mono-oxygenase system: Peroxo-CuII binuclear intermediates in the hydroxylation of an aromatic ring

Hydrogen peroxide reacts with a CuII complex of a m-xylyl binucleating ligand with concomitant hydroxylation to give a phenoxo-bridged complex (previously found as the product of the reaction of dioxygen with the CuI analogue) whereas a newly synthesized mononuclear analogue is unreactive, thereby implicating µ-peroxo–CuII intermediates in the hydroxylation reaction.

Dioxygen-copper reactivity: intermediacy of a peroxo-dicopper(II) (dioxygen-copper) complex in the hydroxylation reaction of a model mono-oxygenase system

Formation de lintermediaire peroxo, avec 2 coordinats qui contiennent la meme unite tridentee amine-pyridyl

(Acetonitrile-κN)aqua[N,N′-bis(pyridin-2-ylmethyl)ethane-1,2-diamine-κ4N,N′,N′′,N′′′]zinc(II) perchlorate

The structure of acetonitrileaqua[1,2-bis(pyridin-2-ylmethyl)ethane-1,2-diamine]zinc(II) perchlorate contains a six-coordinate cation consisting of the tetradentate bispicen ligand, coordinated water, and coordinated acetonitrile with the latter two ligands adopting a cis configuration.

{3,3′,5,5′-Tetramethoxy-2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato}copper(II)

In the title square-planar copper complex, [Cu(C20H22N2O6)], the Cu—N and Cu—O bond lengths are significantly longer than those of its isostructural nickel analog. The title structure is related to that of the corresponding monohydrate. There are significant differences in the conformations of the two complexes. While the monohydrate is mainly planar, in the title compound there is a slight twist in the two benzene rings at each end of the complex [dihedral angle = 13.14u2005(6)°]. All the atoms of the methoxy substitutents are in the plane of the ring to which they are attached (r.m.s. deviation = 0.0079u2005Å) except for one of the methoxy C atoms, which deviates slightly [0.309u2005(4)u2005Å]. In the crystal, weak C—H⋯O intermolecular interactions link the molecules.

[2-({3-[(3-Amino-prop-yl)amino]-prop-yl}imino-meth-yl)phenolato-κO,N,N'',N''']bromidocopper(II).

In the title compound, [Cu(C13H20N3O)Br], the Cu(II) atom is coordinated by three N atoms and one O atom from the deprotonated ligand derived from the Schiff base condensation of 3,3-iminobis(propylamine) and salicylaldehyde. The three N and the O atoms occupy equatorial positions, while the Br atom occupies an axial position. The amine H atoms form intermolecular hydrogen bonds with the Br and O atoms of adjoining molecules

Bis(2-pyridylethyl)ammonium perchlorate

The title compound, C14H18N3+·ClO4−, a perchlorate salt of the monoprotonated form of bis(2-pyridylxadethyl)xadamine, has a structure in which one of the two H atoms on the amine N atom forms hydrogen bonds to the two pyridyl N atoms in a chelating fashion, while the second H atom on the amine is also used in hydrogen bonding to a perchlorate O atom.