摘要：

The mixed ligand complexes of Co(II)metal ions with some heterocyclic nitrogen bases along with 3-cyano-1.-carboethoxyethykne-2,2-dithiolate ion(CED~(2-))of the compositions.Co(N-N)(CED)·2H2O[N-N = o-phen/2.2'-bipy]and Co(N-N)(CED)L2[N-N = o-phen/2,2'-bipy,CED~(2-)= I-cyano-1-carboethoxyethylene-2,2-dithiolate,L = γ-picoline(γ-pic),β-picoline(β-pic),α-picoline(α-pic),pyridine(py)]were characterized and isolated by analytical data as well as physico-chemical methods for example infrared spectroscopy,electronic,magnetic susceptibility,molar conductance.The complexes are soluble in coordinating solvents like DMSO and DMF and decompose below 250 ℃.The synthesized complexes in DMF solution are non-electrolytic as shown by their molar conductance data.The calculated magnetic moments suggest that the syrsthesixed eobalt(Ii)compounds are paramagnetic and produce a low-spin environment for the Co(II)ion.Thermal studies reveal that Co(N-N)contains two coordinated water molecules(CED)·2H2O.Electronic spectra of eobalt(II)complexes with mixed Jigands in DMF solution are consistent with distorted octahedral stereochemistry.The IR studies indicates that the CED~(2-)ion exhibits bideutate chelating behaviour and that heterocyclic nitrogen donors coordinate to Co atoms(II).Reaction with heterocyclic nitrogen donors(γ-picoline,β-picoline,α-picoline,pyridine)signifying the ligand exchange reaction.

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