Abstract
The complexes of some γ-lactone derivatives with cobalt(II), nickel(II) and copper(II) have been synthesized and formulated as [ML 2]· nH 2O, M = Co 2+, Ni 2+ or Cu 2+, n = 2 or 3 and L = anion of the corresponding ligand. Their structures have been suggested on the basis of analysis, spectral (UV-Vis, IR) and magnetic susceptibility data. The thermal analysis revealed the non-coordinated water among these complexes. The infrared spectra show the existence of water molecules involved in a hydrogen-bonding with the coordinated ligands and the γ-lactones are mono-basic bidentate coordinated to the metal ion via the benzoyl carbonyl and the deprotonated hydroxylic oxygen atoms. The bulkiness and the electronic properties of the lactones on the structure of the complexes are rationalized from the electronic spectral data. The interaction of the complexes with different Lewis basis is studied spectrophotometrically. The ligand field parameters are calculated and related to the bulkiness effect of the ligand molecules. These parameters indicate the axial ligation of the base molecules and that the equatorial plane is occupied by the MO 4, M = Co 2+, Ni 2+ or Cu 2+, chromophore. The interelectronic repulsion parameter indicates the ionic nature of these complexes. The extent of distortion from the idealized structure is also discussed.
Published Version
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