COMPLEXES OF BINUCLEATING LIGANDS. X. SOME COPPER(II), NICKEL(II), PALLADIUM(II), AND PLATINUM(II) COMPLEXES OF SULPHUR-CONTAINING LIGANDS

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Abstract
Copper(II) and nickel(II) complexes of the trianionic binucleating ligand (R3-) derived from 4-hydroxy-bis-3,5-[N-(S-methyl-dithiocarbamate) formimidoyl]toluene have the general form RM2(Z) where Z represents a range of monoanionic bridging species. Palladium(II) and platinum(II) complexes formed by R3- and the related trianionic ligands derived from 2-hydroxy-5-methylisophthalaldehyde di-2′-mercaptoanil and 2-hydroxy-5-methylisophthalaldehyde dithiosemicarbazone have the 2:1 formulation [(ligand)M2(Z)] only when the bridging species, Z, coordinates strongly enough to give the binucleating ligand substantial assistance in maintaining the binuclear structure. In the absence of a ‘good’ bridging group and in the presence of pyridine, 3:2 complexes of the form [(ligand)2 M3 (pyridine)2] (where M = Pd, Pt) are produced in which the binucleating ligand fails to bind the two metals in close proximity.
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