Polynuclear complexe

Olefin and acetylene complexes of Au(I) can be prepared by direct iateraction of the unsaturated compounds with a Au(I) hahde (190,191). The resulting products, however, are not very stable and decompose at low temperatures. Reaction with Au(III) hahdes leads to halogenation of the unsaturated compound and formation of Au(I) complexes or polynuclear complexes with gold ia mixed oxidatioa states. 

Metal—Metal Bonding. The degree of nuclearity exhibited as a function of the oxidation state of molybdenum is shown in Table 1. In the highest oxidation state, Mo(VI), the tendency is to form mononuclear or a wide variety of polynuclear complexes in which there are no... 

The enthalpies of these hydrolysis reactions have also been determined (112). Polynuclear complexes such as[(Pu02)2(OH2], [(Pu02)3 (OH) ), and [(Pu02)4(0H)y] have been inferred from potentiometric titrations (105). 

Silver ions form a number of complexes with both TT-bonding and non-TT-bonding ligands. Linear polynuclear complexes are known. The usual species are AgL and AgL2, but silver complexes up to AgL have been identified. Many of these complexes have commercial appHcation. 

The field of oxo-bridged polynuclear complexes of manganese, much of it involving mixed... 

But probably the most interesting of Ihe polynuclear complexes are those containing -0-0-bridges (see also p. 616). 

Fleterocyclic bridging ligands in controlling electronic and magnetic properties in polynuclear complexes 98ACR842. 

In the foregoing it has been assumed that the complex species does not contain more than one metal ion, but under appropriate conditions a binuclear complex, i.e. one containing two metal ions, or even a polynuclear complex, containing more than two metal ions may be formed. Thus interaction between Zn2+ and Cl ions may result in the formation of binuclear complexes, e.g. [Zn2Cl6]2-, in addition to simple species such as ZnCl3 and ZnCl -. The formation of bi- and poly-nuclear complexes will clearly be favoured by a high concentration of the metal ion if the latter is present as a trace constituent of a solution, polynuclear complexes are unlikely to be formed. 

Clusters, Metal-Metal Bonding and Polynuclear Complexes 15... 

Polynuclear complexes of iron and their biological implications. T. G. Spiro and P. Saltman, Struct. Bonding (Berlin), 1969, 6, 116-156 (170). 

Polynuclear complexes with aminoalcohols and iminoalcohols as ligands O-bridged and hydrogen bonded species. J. A. Bertrand and P. G. Eller, Prog. Inorg. Chem., 1976, 21, 29-53 (54). 

Dinuclear and polynuclear complexes with azomethine ligands and tneir magnetic properties. V. A. Kogan, V. V. Zelentsov, O. A. Osipov and A. S. Burlov, Russ. Chem. Rev. (Engl. Transl.), 1979, 48,645-656 (112). 

Spiro G, Saltman P (1969) Polynuclear Complexes of Iron and Their Biological Implications. 6 116-156... 

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