Metal Chelates of Heterocyclic Nitrogen Containing Ketones. XIX. Some Transition Metal Complexes of SNN-Containing Ligands

Abstract

The vibrational (conventional and far infrared), ¹H n.m.r. and electronic spectra together with the room temperature magnetic susceptibility and molar conductivity measurements are reported and discussed for the complexes [Ni(PPKTE-H)X]₂, [Ni(LPKTE-H)]₂X₂ and [M(L-H)Cl₂.H₂O], where L = phenyl-2-picolylketone-hydrazone-S-methyl dithiocarboxylate (PPKTE) or phenyl-2-(2,6-lutidyl)ketone-hydrazone-S-methyl dithiocarboxylate (LPKTE), X = Cl⁻, Br⁻ or I⁻ and M = Cr³⁺, Mn³⁺ or Fe³⁺. The prementioned data suggest trigonal bipyramidal structure for [Ni(PPKTE-H)X]₂, square-planar structure for [Ni(LPKTE-H)]₂X₂ and octahedral structure for [M(L-H)Cl₂.H₂O]. The ligating properties of these complexes towards pyridine are also reported. The ligand field parameters for some of these complexes are given and used to interpret the nature of bonding.