New Mixed Ligand Complexes of Co(II) & Ni(II) Containing Isatinazine and Semicarbazone

Abstract

The preparation and characterization of new cobalt(II) and nickel(II)
complexes with mixed ligands including isatinazine-IAH2 and semicarbazone ligands
(including benzoin- semicarbazone-B'SCH2 or isatinsemicarbazone-ISCH2 or
isatinbis(semicarbazone)-ISCH3) have been carried out in both neutral (or slightly
acidic) and basic medium. The resulted complexes have been characterized using
metal analysis by atomic absorption spectroscopy and by precipitation methods,
relative molecular weight determina- tion, molar conductance measurements, molar
refraction, magnetic susceptibilities, infrared and electronic spectra.
The resulted complexes have general formula [M(IAH2)(LH2,3)](NO3)2 or
[M(IAH2)(LH2,3)NO3]NO3 in neutral (or slightly acidic) medium whereas neutral or
negative ionic complexes of the general formula [M(IAH2-y΄)(LH2,3-y˝)] or
Naw[Co(IAH2-y')(LH2,3-y") have been resulted in basic medium, (where M= Co(II) or
Ni(II); w=1 or 2; y´=1 or 2; y˝=1 or 2; LH2,3= the ligands B'SCH2 or ISCH2 or
ISCH3) in which the ligands acted as neutral or anionic (-1 or -2) in neutral (or
slightly acidic) or basic medium, respectively. Accordingly, hexacoordinated
mononuclear complexes have been proposed for the resulted complexes had
octahedral geometry.