Clusters with mixed-charge cluster units

3 Clusters with mixed-charge cluster units 

TaeCln cluster - the [Ta6Cli2(PrCN)6] + cation and the [(Ta6Cli2)Cl6] anion, each having imposed I symmetry. Selected bond lengths for the cluster cation and the cluster anion are given in Table 1. 

4) units in the same molecule. The packing of the octahedral [Ta6Cli2(PrCN)6] + cluster cations and the octahedral [(Ta6Cl 2)Cl6] cluster anions in the crystal structure of [Ta6Cli2(PrCN)6][(Ta6Cli2)Cl6]-2PrCN is shown in Fig. 3. 

2 [M6Xi2(EtOH)6l[(Mo6Cl8)Cl4X2] wEtOH wEt20, 

The hexanuclear molybdenum halide clusters (Mo6Xs)X4, i.e. (Mo6X 8)CP2CF 4/2, are known to react with some transition metal halide compounds forming two different types of cluster polymeric clusters with bridging outer halide ligands (X ) and discrete clusters with terminal halide ligands (X ). 

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The cluster anion 486 is formed of a trigonal Gog prism, of which the two C03 triangles are capped by two Co-PPhs units. All Co atoms of the prism are in a planar-trigonal environment formed by three NPh atoms. On the other hand, the capping cobalt atoms are in a tetrahedral environment. This Cos cluster should have a formal charge of -fl7. This is possible if one considers that the cluster is a mixed-valent molecule built with seven Co " " and one Co ions. 

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