Cobalt Coordination Complexes Research Articles

Some amine N-oxide complexes of trivalent cobalt

Three new cobalt(III) coordination complexes with bidentate amine N-oxide ligands have been synthesized and characterized via elemental analyses, equivalent weight determination, molar conductance and magnetic susceptibility measurements, and infrared and electronic absorption spectroscopy. Two are ionic complexes with general formula [CoL3](ClO4)3 where L = 2,2′-bipyridine-N,N′-dioxide and 1,10-phenanthroline N-oxide. The third is a neutral CoL′3 complex where L′ = picolinate N-oxide. The compounds are six-coordinate, diamagnetic, and have electronic absorption spectra typical of the strong field d6 configuration of trivalent cobalt. The perchlorate groups are nor coordinated to cobalt(III) in the solid state or in solution.

Conformational Analysis of Coordination Compounds. VI. Force Field Calculation of Thermodynamic Properties of Tris(diamine)cobalt(III) Coordination Complexes.

Conformational Analysis of Coordination Compounds. VI. Force Field Calculation of Thermodynamic Properties of Tris(diamine)cobalt(III) Coordination Complexes.

Co-ordination complexes of Copper(II), Cobalt (II) and Nickel (II) with N-benzoyl-N'-dimethyl/diethyl thiocarbamides

Co-ordination complexes of Copper(II), Cobalt (II) and Nickel (II) with N-benzoyl-N'-dimethyl/diethyl thiocarbamides

Quantitative polarographic determination of azides in cobalt(III) coordination complexes

Quantitative polarographic determination of azides in cobalt(III) coordination complexes

Infrared and far infrared spectra of tris(diamine) cobalt (III) coordination complexes

Spectra in the region 4000-10 cm −1 of mixed ethylenediamine-trimethylenediamine complexes of cobalt (III) are reported. The use of different halogen anions allows a distinction between internal and external vibrations. Internal vibrations of individual chelate rings are almost independent of other rings

Coordination Complexes of Copper (II), Nickel (II), Cobalt (II) and Cobalt (III) with Para-substituted 1,3-diphenyltriazene

Coordination Complexes of Copper (II), Nickel (II), Cobalt (II) and Cobalt (III) with Para-substituted 1,3-diphenyltriazene

Room temperature curing of unsaturated polyesters with cobalt (II) complexes

AbstractCobalt promoters presently used in the polyester processing industry suffer from many shortcomings ranging from shelf instability to strong discoloration of the resins and relatively poor activity. This paper describes the various performance improvements obtainable with coordination complexes of cobalt which can be used as polymerization accelerators in presence of organic peroxide initiators. These complexes appear to present significant advantages over the conventional cobalt carboxylates. Catalytic activity up to ten times that of cobalt soap was recorded with some complexes in various resin systems, without deleterious effects on physical properties. As gel‐cure modifiers, the compounds evaluated seem to increase the long term shelf stability of pre‐promoted resins while reducing the discoloration and air inhibition during the curing process of polyester thin films.