Mixed trinuclear

Mixed Trinuclear Dicobaltiron and Dicobaltruthenium Cluster Complexes 351... 

MIXED TRINUCLEAR DICOBALTIRON AND DICOBALTRUTHENIUM CLUSTER COMPLEXES... 

As we have seen previously, there is a subtle equilibrium between the trinuclear Ag3 and the dinuclear Ag complex whereas this equihbrium was not observed in the mixed dinuclear AuAg complex. Similarily, the mixed trinuclear AuAg complex apparently exists only in the open form shown in Figure 3.5 and not in the triangular form shown in Figure 3.4 [16]. 

Trinuclear complexes can be made if bis(amido) chelate ligands are used in place of the tripod ligands. The addition of two CpM (CO)2 units (M = Fe, Ru) can be carried out sequentially. However, mixed trinuclear complexes possessing Zr-Ru-Fe metal centers cannot be prepared this way (Scheme 7). ... 

C-5 A mixed trinuclear cluster complex [Ag Au(2,4.6-Me3C6H2))2(dppm)2]C104 (63,... 

Tetrazole with [(T) -C3Hj)2Rh(acac)] gives the trinuclear complex 191 (86JCS(D)2193). This product with [Rh( j.-Cl)(CO)2]2 produces the mixed-valence trinuclear species 192. 

Cold(l) and Silver(l) Mixed-Metal Trinuclear Complexes 33... 

Based on the fact that pi-acids interact with the trinuclear gold] I) pi-bases, TR(carb) and TR(bzim), the trinuclear 3,5-diphenylpyrazolate silver(I) complex was reacted with each. Mixing [Au3(carb)3] or [Au3(bzim)3] with [Ag3(p,-3,5-Ph2pz)3] in CH2CI2 in stoichiometric ratios of 1 2 and 2 1 produced the mixed metal/mixed ligand complexes in the same gold-silver ratios. The crystalline products were not the expected acid-base adducts. It is suspected that the lability of the M-N bond (M=Au, Ag) in these complexes results in the subsequent cleavage of the cyclic complexes to produce the products statistically expected from the stoichiometry of materials used [74]. As a result of the lability of Au-N and Ag-N bonds, and the stability of... 

Au-C bonds, mixed metal gold-silver dimers of planar, trinuclear complexes are readily formed by mixing gold(I) carbeniates and gold(I) benzylimidazolates with silver(I) pyrazolates in stoichiometric ratios. The complexes retain the ligands associated with the metal atoms of the starting materials. 

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