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3 Polish Journal of Chemistry

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Synthesis and Spectral Studies of Mixed Ligand Complexes of Co(II) with 5-Nitrosalicylaldehyde and beta-Diketones, Hydroxyaryl Aldehydes or Ketones

Agrawal A., Sharma K. M., Prasad R. N.

Polish Journal of Chemistry

2007

Vol. 81, nr 12

2081-2087

Mixed ligand complexes of CoII of the type [CoLL'(H2O)2] (where HL = 5-nitro salicyl - aldehyde, HL' = salicylaldehyde, 2-hydroxyacetophenone, 2-hydroxypropiophenone, 2-hydroxybenzophenone, 2-hydroxy-1-naphthaldehyde, pentane-2,4-dione, 1-phenyl - butane-1,3-dione or 1,3-diphenylpropane-1,3-dione) have been syn the sized and characterized by elemental analyses, TLC, conductances, magnetic moments, IR, electronic and FAB mass spectra.

Determination of Stability Constans of Copper(II)/Cobalt(II)-Methionine and Copper(II)/Cobalt(II)-Methionine-Cysteine (Binary and Mixed) Complexes by Paper Electrophoretic Technique

Tewari B.

Polish Journal of Chemistry

2005

Vol. 79 / nr 12

1853-1860

The stability constants of copper(II) and cobalt(II) with methionine and cysteinewere determined by paper ionophoretic technique. Beside binary, mixed ligand complexes have also been studied, in which methionine and cysteine act as primary and secondary ligand, respectively. The stability constant of Cu(II)-methionine-cysteine and Co(II)-methionine-cysteine mixed ligand complexes were found to be 2.80+ -0.07 and 2.44+ -0.11 (logarithm of stability constant values), respectively at ionic strength 0.1 M and temperature of 35 graduate C.

Spectrochemical Properties of Noncubic Transition Metal Complexes in Solutions. XIII. Angular Overlap Treatment of Diaquabis(salicylideneaminothiazole)cobalt(II)

Kuźniarska-Biernacka I., Kurzak K.

Polish Journal of Chemistry

2003

Vol. 77 / nr 1

13-19

Mixed ligand cobalt(II) complex with monodentate (water) and bidentate (Schiff base: salicylidene-2-aminothiazole) ligands has been characterized by elemental analyses, molar conductivities, ultraviolet (UV) and visible (VIS) spectroscopy. The electronic spectra of solids as well as solutions exhibit pseudo-octahedral coordination geometry for the cobalt centre. The molar conductivities indicate their non-electrolytic properties in solvents studied. Combined multi-technique experiments have been used to postulate theC2h geometry for the species in solutions and to determine the coordination properties of ligators and their bonding abilities (ligand-field parameters).