Tetrairidium cluster, supported

Triantafillou, N. D., and Gates, B. C., Magnesia-supported tetrairidium clusters derived from [Ir4(CO)12]./. Phys Chem. 98,8431 (1994). 

These ligand exchange and association reactions require complexes (catalysts) that are stable during the synthesis. An alternative is the In situ formation of the supported species, illustrated by the formation of a supported tetrairidium cluster, as follows ... 

These comparisons prompted the Rosch group [32,33] to conclude that some Ugands remained on the supported clusters after decarbonylation this conclusion may be quite general—supported metal clusters are highly reactive, and typical oxide and zeoUte supports are not unreactive. Thus, a representation of supported clusters such as tetrairidium on 7-AI2O3 as 4/7-AI2O3 is a simplification that fails to account for the ligands on the cluster. 

Kawi S, Chang J-R, Gates BC (1993) Tetrairidium clusters supported on y-alumina Formation from [Ir lCOljJ and carbon monoxide-induced morphology changes. J Phys Chem 97 5375... 

Since the late 1990s, new approaches to the dispersion of noble metal particles in polymer matrixes by means of chemical, photochemical and radiation-chemical reduction, the evaporation of metal atoms (including solvated ones) into different supports, etc. have been developed (see Section 8-1) [44]. Nevertheless, catalysts prepared from individual immobilized metal clusters have more definite, mostly predetermined, structures. For these purposes derivatives of Oss, It4, RU4, Rh4, Rh6, etc. clusters are most often used. Earlier studies [46] showed that the rate of ethylene hydrogenation promoted by tetrairidium or tetraruthenium carbonyl clusters bound to phosphynated polymers decreased with an increase of the number of donor... 

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