Heteronuclear High-nuclearity Clusters

Treatment of [Ru5(p5-C)(CO)i4] with two equivalents of [Pd2(ii-Cl)2(ri -C3H5)2] in THF at room temperature afforded the neutral [RuioPd8()i6-C)2(p-C3Hs)4(CO)27] (13). The Pdg core consists of two unsymmetrically-capped co-planar fused squares, with a square pyramidal Rus framework coordinated to each side. The product resulting from reaction between [PPN]2[Ru6(p6- 

C)(CO)i6] and [Pd(NCMe)4][BF4]2 was found to depend on the reaction conditions employed equimolar reaction in refluxing CH2CI2 in air gave [PPN]2-[Rui2Pd2(ii6-C)2(CO)32] (14) whereas the same reaction in THF at room temperature under Ar afforded [PPN]2[Rui2Pd4()i6-C)2(CO)32] (15). The cluster dianion 14 consists of two Ru6 octahedra linked via two Pd atoms the Ru-Ru bond between the equatorial ruthenium atoms which interact with the palladium atoms is broken, and each octahedron contains an interstitial carbon atom. Complex 15 contains two additional Pd atoms forming a bent square the two Ru6 octahedra are now twisted by almost 90°.  

The Fe-Hg mixed-metal cluster [Fe(HgX)2(CO)4] (X = Cl, Br) has been reacted with PBu (SiMe3)2 in the presence of PBuV(PPh4)Cl to give [Fe8Hgi2(p5- 

The chemistry of Rh-Ni clusters has been elaborated via reaction of the hexanuclear dianion [Ni6(CO)i2] with [Rh2(p-Cl)2(ri -COD)2] (COD = 1,5-cyclooctadiene), affording, in sequence, the trianionic clusters [RhNiio(p-CO)ii(CO)8] (18) and [Rh3Ni9(CO)22] (19). Cluster 18 possesses an incomplete icosahedral core analogous to the c/oso-borane cluster and is the 

A novel mixed-metal Ir-Hg cationic cluster [Ir6Hg8(C0)6Cp6](CF3C02)6 (21) has been prepared from reaction between [Ir(CO)2Cp] and Hg(02CCF3)2. The cluster contains mercury atoms in three different environments (six- and four-coordinate) and five-coordinate iridium atoms arranged in an unprecedented distorted square-pyramidal geometry.  

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The most outstanding examples of heteronuclear gold clusters are the series of Au-Ag supraclusters whose metal frameworks are based on vertex-sharing. In the structure of these compounds, the basic building block is the 13-metal atom (Au7Ag6) icosahedra. These high nuclearity clusters have been termed clusters of clusters and they follow a well-defined growth sequence by successive additions of... 

Heteronuclear Carbonyls and High Nuclearity Carbonyl Clusters... 

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... 

Metal bromides, 4 322-330 Metal can food packaging, 18 37-39 Metal-carbene complexes, 26 926 Metal-carbon compounds, 4 648, 650 Metal-carbon eutectic fixed points, 24 454 Metal carbonyl catalysts, supported, 16 75 Metal carbonyl complexes, 16 73 Metal carbonyls, 15 570 16 58-78 bonding and structure of, 16 59-64 from carbon monoxide, 5 12 in catalysis, 16 72-75 economic aspects of, 16 71 health and safety aspects of, 16 71 heteronuclear, 16 69-71 high nuclearity, 16 66-69 high nuclearity carbonyl clusters, 16 64-66... 

Summary of Metal-Metal Bond Lengths for High-Nuclearity Gold-Silver Heteronuclear Cluster Compounds... 

Over 20 years ago, the structure of the first high-nuclearity carbonyl cluster (HNCC), RhgfCO) , was elucidated 164). Since that time, the field has grown to a state where there is now an enormous number of such species. We have chosen to define HNCC as homo- or heteronuclear carbonyl clusters of transition and main group metals containing five or more metal atoms, each of which is linked to the metal core by at least one M—M bond. 

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