| Summary: | The first nickelacarborane with <i>closo-nido</i> structure [10′,11′-(Py)<sub>2</sub>-3,9′-Ni(1,2-C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)(7′,8′-C<sub>2</sub>B<sub>8</sub>H<sub>8</sub>)] was isolated from the reaction of nickel(IV) bis(dicarbollide) with pyridine. The molecular structure of this complex was determined by single crystal X-ray diffraction. The nickel atom is a common vertex for the <i>closo</i>-NiC<sub>2</sub>B<sub>9</sub> cluster and the <i>nido</i>-NC<sub>2</sub>B<sub>8</sub> cluster where it is located together with carbon atoms in the open NiC<sub>2</sub>B<sub>2</sub> pentagonal face. It is assumed that its formation proceeds through the nucleophile-induced removal of the B(6)H vertex followed by rearrangement of the forming 11-vertex cluster, which most likely proceeds through a sequence of closing and opening reactions.
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