Studies in the coordination chemistry of some group VB and VIB ligands

Studies in the coordination chemistry of some group VB and VIB ligands

Studies in the coordination chemistry of some group VB and VIB ligands

The synthesis and properties of palladium(II) and platinum(II) halide complexes of a series of systematically varied dithioether ligands have been studied. The isolated compounds were of the type [M(dithioether)X₂] (M = Pd, Pt; X = Cl, Br, I; dithioether = RS(CH₂)_NSR (n = 2,3), cis-RSCH=CHSR, o-C₆H₄(SR)₂; R = Me,φ) which are assigned cis planar structures, (Pd(φS(CH₂)_nSφ)X₂] (n = 4,6) which are polymeric with trans ligand bridges and [M(φS(CH₂)₁₂Sφ)X₂] which are trans chelate monomers. The ligand φSCH₂Sφ behaves as a monodentate ligand in [M(φSCH₂Sφ)₂X₂] compounds.

Iron(III) bromide reacted with some bidentate group VB ligands to form complexes of the type [FeL₂Br2][FeBr₄], containing a low spin tetragonally distorted octahedral cation and a high spin tetrahedral anion, [Fe(LO₂)(H20)2Y2] [Y = NO₃, NCS) and also [(HL)2C1₃FeOFeC1₃]. Iron(III) halide complexes of monodentate group VB ligands have also been prepared.

Cobalt(II) and nickel(II) halides reacted with some mixed donor (N, P, As, Sb, S) methyl-substituted o-phenylene ligands to give a range of complexes formulated as [NiLX₂] and [CoLx₂] (X = halide, NO₃ NCS) (CoL₂X]Y (X = halide; Y = X, ½CoX₄, C1O₄, Bφ₄) and [CoL₂](ClO₄)₂.

A number of air-stable, mixed donor ligands have been tested for their suitability as extractants of nickel for a solvent extraction process. Their cobalt(II), nickel(II), and copper chemistry in both non aqueous and aqueous conditions has been investigated. The didodecyldithiophosphoric acid ligand exhibited the greatest potential.

The above-mentioned formulations have been made on the evidence of infrared, electronic, Mössbauer and ¹H nmr spectral data and also elemental analysis, molecular weight, conductivity and magnetic susceptibility measurements.

1981