Heptanuclear carbonyl hydrides

Table II. Penta-, Hexa-, and Heptanuclear Carbonyl Hydrides...

In the penta-, hexa-, and heptanuclear carbonyl hydride clusters, terminal hydrides are observed only in the less crowded species, and again no evidence for the presence of interstitial hydride is found. 

Both compounds contain the carbide atom in an octahedral cavity. The hydride cluster is a simple octahedron with three terminal carbonyls on each rhenium atom. The heptanuclear cluster can instead be considered as the same octahedron in which the two hydrides are replaced by a [Re ( 0)3] fragment leading to a monocapped octahedral cluster. Both structures have seven skeletal dectron pairs. 

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See also in sourсe #XX -- [ ]

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