Chlorides tetrameric clusters

The structure of solid Cu(I) chloride (zinc blende, Uo = 5.406 A (35)) is compatible with the formation of a clustered product. We have shown cryoscopically in 32 that the primary product of oxidation is a stable tetrameric cluster, Reaction 8 (ligands omitted) (30). Based on... 

Irradiation (A > 520 nm) of this tetranuclear cationic cluster in 12 M HCl solution produces a mixture of Rh2(bridge)4Cl2 and hydrogen. In hydrochloric acid solution it is believed that two chloride ions coordinate to the tetrameric cluster, and hence the photogeneration of hydrogen from hydrochloric acid follows the path-... 

Although molecules cannot be identified as the building blocks of ionic crystals, the free molecules of some compounds may be considered as if they were taken out of the crystal. A nice example is sodium chloride whose main vapor components are monomeric and dimeric molecules. They are indicated in the crystal structure in Figure 9-56, as is a tetrameric species. Mass spectrometric studies of cluster formation determined a great relative abundance of a species with 27 atoms in the cluster. The corresponding 3x3x3 cube may, again, be considered as a small crystal [106],... 

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