Heteronuclear clusters complexes

The osmium compound [0s3(u-H)2(C0)10] is a rich source of heteronuclear cluster complexes by virtue of the reactivity of the osmium — osmium double bond. The compounds [Pt(C2Hi.)2(PR3)] [pr3 = P(cyclo-CsHi1)3, PPh3 or PBuc2Me] afford the 58-electron clusters(43) which undergo dynamic behaviour in solution with site-exchange of the hydrido ligands(28). Compounds (43) react... 

Perhaps another reason for the development of the organometallic chemistry of homonuclear and heteronuclear cluster complexes is the sheer academic fascination at the great synthetic and structural diversity of these molecules. Various aspects of the chemistry of these species, particularly those involving interactions with unsaturated organic molecules, have been discussed in a number of recent publications (9-15). 

A review article illustrates the use of W(CO)2(CR)Cp as precursor for the synthesis of heteronuclear cluster complexes in which the y3 CR ligand is often present.Addition of Fe2(CO)9 to Mo(CO)2(Ctol)Cp affords the y-alkylidyne... 

More recently, Adams and coworkers have provided a very interesting case of heteronuclear clusters that are very active for the hydrogenation of alkynes [4, 54, 55]. The high-nuclearity layer-segregated Pt-Ru complex [Pt3Ru6(CO)21(jU3-H)(/ -H)j], consisting of three stacked triangular layers of metal atoms with an... 

Digermanium hexachloride, synthesis in electric discharge, 6 173, 272 Diglycolic acid, complex formation by, 3 276 Digold heteronuclear cluster compounds. X-ray crystallography, 39 358-362... 

Hexagold heteronuclear cluster compounds, X-ray crystallography, 39 369-371 Hexagonal framework supramolecular complexes, 46 204-219 Hexahalochalcogen acids, 35 264 Hexahalochalcogenates (IV), 35 251-253... 

The square face of cluster 5 is readily capped by a number of different metal fragments affording octahedral heteronuclear clusters in high yield. The dianion 5 reacts with the Group 6 complexes M(CO)3L3 (M = Cr,... 

Addition of Co2(CO)8 to the //2-vinylidene complex (40) (Section IV,A,6) affords the heteronuclear cluster derivative (88) in 55% yield, in which the vinylidene group now bridges all four metal atoms ... 

Fig. 1. Examples of the synthesis of heteronuclear gold cluster complexes by the reaction of Au(PPh3)Cl with transition metal anions.

In theory, pyrolysis of carbonyl-based heteronuclear cluster compounds should, by analogy with homonuclear carbonyl cluster chemistry, cause elimination of carbon monoxide followed by cluster aggregation. In practice it is difficult to predict the course of these reactions, which can involve simple loss of ligand, cluster aggregation, or degradation, and reactions are often complex and result in low yields. A few... 

Reaction of the rhenium hydride complex ReH7(PR3)2 (where R = Ph or p-tol) with Au(PPh3)N03 has yielded the heteronuclear cluster compounds [Au5Re(H)4(PR3)2(PPh3)5](PF6)2 (148) in which the metal cores are based on edge-shared bitetrahedra with the rhenium atom at one of the two most-connected vertices. This is illustrated in Fig. 24. A... 

The vast majority of the currently known heteronuclear cluster compounds containing M(PR3) (M = Cu, Ag, or Au, R = alkyl or aryl) units were synthesized by treating an anionic mono-, di-, or polynuclear precursor with the complexes [MX(PR3)j (X = Cl, Br, or I). The first example of... 

The Group IB metal site preferences in heteronuclear cluster compound allow coinage metal exchange reactions between clusters and mononuclear complexes to be used as a high yield synthetic route to novel trimetallic species containing two different Group IB metals. These reactions are discussed in detail in Section II,D,2. 

In search of an example for a heteronuclear cluster (CO)9Co3ER where E is a transition element with only one ligand R, the synthesis of the complex shown in Fig. 7, recently succeeded41. ... 

Polynuclear inorganic complexes exist in a bewildering array of structural types, such as ionic solids, molecular polymers, extended assemblies of oxoanions, chains and rings, bridged metal complexes, and homonuclear and heteronuclear clusters. This section primarily treats the nomenclature of bridged metal complexes and homonuclear and heteronuclear clusters. Coordination polymers are treated extensively elsewhere.6... 

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