Metallaboranes structural relationship

Initially it was assumed that the polyhedra in metallaboranes would be the same as the polyhedra in isoelectronic metal-free boranes using the isolobal/ isoelectronic relationships noted above. However, as metallaborane chemistry was developed further, particularly by Kennedy and co-workers,a variety of deltahedral metallaborane structures were discovered based on deltahedra topologically distinct from the deltahedra found in simple metal-free boranes and carboranes. Of particular interest was the discovery of 9- and 10-vertex metallaboranes based on deltahedra with the transition metal at a degree 6... 

A comprehensive summary of the theoretical contributions over the past 40 years towards the understanding of the relationship between two-dimensional aromaticity (hydrocarbons) and the electronic structure of three-dimensional deltahedral boranes. Note in particular that rearrangement processes and the isocloso problem in metallaboranes have also been discussed.11... 

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