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Extra info for Comprehensive Coordination Chemistry II. From the Molecular to the Nanoscale: Synthesis, Structure, and Properties

Example text

The {Mo132} Keplerate cluster is shown on the LHS and the {Mo116} is shown on the RHS. The pentagonal centers of the {Mo(Mo)5} units are shown as white polyhedra whereas the appended Mo atoms are shown as very dark gray polyhedra. The {Mo2} groups are shown by the lighter gray polyhedra. {Mo132} {Mo72M30} Figure 67 A representation of the structure of the {Mo72M30}cluster on the RHS and a comparison with the {Mo132} Keplerate cluster on the LHS.

The original {Mo154} cluster. These defects manifest themselves as missing {Mo2} units, but statistically these defects can sometimes be seen as partially occupied {Mo2} units when the distribution suffers from rotational disorder or translational disorder within the crystal structure. The most extreme case found to date has six defects, three on each side of the Giant-Wheel cluster and is a {Mo142} cluster (53),156,157 see Figure 47. In this case the synthetic conditions needed to isolated the {Mo142} required a very large concentration of electrolyte (in this case ca.

156,157 It is interesting that the sodium ions were found to be ligated to the oxygen atoms of the remaining {Mo2} units or ligated to the oxygen atoms present in the defect sites. In a recent study Yamase et al. 160 32 High Nuclearity Clusters: Iso and Heteropolyoxoanions and Relatives 14 × with defects 14 × {Mo154-x} {Mo154} {Mo8} {Mo2} Figure 47 A representation of the building blocks that comprise the top and bottom surfaces of the wheel cluster on the LHS. On the RHS the derivative with defects is shown; literally the removal of a number of the {Mo2} results in a defect structure.

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