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.
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.
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).
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.