Trimetallic clusters

AgI(PPh3)]4, the trimetallic cluster [(Ph3P)6Au6Ag6Pt(AgI3)2] was isolated. The structure is a icosahedron of the three metal atoms with two capping Agl3 units.3273... 

Reaction of 252 with Co2(CO)g under conditions of high concentration of the di-cobalt carbonyl gives trimetallic (77S-CsMes)Ru (77S-CsMes)RuCO Go(CO)2(/t3-CO)B3H6, 255, whereas low concentrations allow competitive degradation to yield monometallic (77S-CsMes)Ru (CO)(/i-H)B3H7 256.153,164 This reaction also affords ((77S-CsMes)Ru)2(CO)2B3H7 257 in variable yield dependent on the solvent used, as well as the linear trimetallic cluster 314 (Section 3.04.3.3.5) in very low yield.165... 

Complexes containing a single carbon atom linking two trimetallic clusters have been obtained from the reaction between Co3( i3-CCl)(CO)9 and [PPh4]2[Fe3( i3-CCO)(CO)9] in the presence of T1BF4 451 The Fe3 cluster replaces the halide to give (269) which in turn is converted into the ethyl... 

A more comprehensive molecular orbital treatment of the bonding in alkyne-substituted trimetallic clusters has recently appeared. See Halet et al Inorg. Chem 24, p. 218 (1985). 

Alkyne scission also occurs when a rhodium or iridium trimetallic cluster is heated under vacuum (449). 

W. Chen, J.Y. Wang, C. Chen, Q. Yue, H.M. Yuan, J.S. Chen, and S.N. Wang, Photo-luminescent Metal-organic Polymer Constructed from Trimetallic Clusters and Mixed... 

Table 8. Electrode potentials (V) and peak-to-peak separation (in millivolts) for the reduction processes exhibited by Phosphinidene trimetallic clusters [50, 51]...

In the sulfur-capped trimetallic clusters, the antibonding LUMO is centred on the metallic triangle (in particular, the FeCo2 core, it is mainly localized on the Co-Co edge). It has been briefly reported that the present chromium adduct undergoes a quasireversible one electron reduction just at the same potential value (E° = — 0.28 V, in Acetone solution) as that exhibited by FeCo2(S)(CO)9 [59],... 

As3 (p. 588), etc.], and /X3- and /X4-bridging Te atoms have been found in the heptanuc-lear trimetallic cluster [ Fe2(CO)6 (/r4-Te)(/43-Te) Re3(CO)ii ] The core geometry of this latter cluster can be described as a Fe2Te2 butterfly with wing-tip Te atoms bridging a bent Ru3 unit. 

Although there are a comparatively large number of binuclear systems which contain a II —CO, a limited number of polynuclear species have been characterized. The only example of a trimetallic cluster with a n —CO is Cp3Nb3(CO)7 (182,183). Equation (30) gives the synthesis for this species,... 

Figure 8. Molecular structure and Hg-S bond lengths of the trimetallic cluster [Hg3(SC2H4S)j], based on (85). Intramolecular secondary bonding interactions arc indicated by the dashed line.

A related cationic cluster [Ru3(/i-H)(/i3-ampy)(/r,77 77 -PhG GHPh)(GO)8][BF4] is a catalyst precursor for homogeneous hydrogenation of diphenylacetylene to cis- and /ra r-stilbene under very mild conditions, 333 K and less than 1 atm hydrogen. Reactivity, spectroscopic, and kinetic studies suggest that the active catalyst is a cationic trimetallic cluster." ... 

Trimetallic clusters with AiXainino)germylenes and stannylenes... 

Comparison of the hydrogenation of 1,3-cis- and 1,4-cA-pentadiene with heterogeneous catalysts derived from the trimetallic cluster [Os3Ni(/r-CuPPh3)( M-... 

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