Mercury complexes metal ligands

Although reviews have appeared on the polyatomic cations of zinc, cadmium and mercury, 4a,1468b we shall be concerned here with complexes of ligands in which there are donor sites enabling it to coordinate more than one metal ion or where a ligand may have a bridging function giving rise to multi nuclear species. 

The group of ligands discussed above are mostly of the monodentate Te-donor type, a feature which has an explanation in the use of soft Pearson acids (see Sec. 1.1.2) as the sources of metallic ions. Thus, structure 515 of the corresponding mercury complex, prepared on the basis of a ligand system 512 [905], was established by x-ray diffraction ... 

It is less well known that the synthetic methods of (3-diketonate complexes have been elaborated, where ligands of the type discussed are bound with the metal through a C-donor atom 850 [6,11,12,14,85 88], Such mercury complexes, for example 851, were obtained as a result of transformation (4.20) [89] ... 

Other metals for which complexes of ligand 79 have been isolated are iron(II)48, 5s, 56,58,59) ir0n(III) 47,52, s4, s6> 59), zinc(II) 57 59), cadmium(II) 59,60,78), mercury(II) 58,78), magnesium(II) S9 60), manganese(II)58>, nickel(II)79), and lead(II)80). The reduction of bis-amws 79 has been reported to afford ligand 81. In addition, the transition metal complexes of iron(III), cobalt(III), nickel(II), and copper(II) with ligand 81 have been prepared and characterized 53). 

Examples conforming with the S 2 mechanism can also be provided816,83l They were found, as one would expect them, for metal ions possessing a distorted coordination shell (e.g. mercury complexes with their preferred coordination number two, square planar configurations with weakly coordinated axial ligands, etc.). 

Diethvldithiocarbamato Mercury (II). The incorporation of metal-ligand complexes within polymeric membranes for the development of new anion sensors is not limited to the use of metalloporphyrins. Indeed, recent studies with the Hg (II) complex of diethyldithiocarbamate (Hg(DDC)2) have yielded a new membrane electrode with relatively high... 

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