Rotational conformation of 8,8′-dihalogenated derivatives of cobalt bis(dicarbollide) in solution

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The 1H NMR study demonstrated that the transoid conformation of dihalogenated derivatives of cobalt bis(dicarbollide) [8,8′-X2-3,3′-Co(1,2-C2B9H10)2]− (X = Cl, Br, I), stabilized by intramolecular $$\text{C} - \text{H} \cdots \text{X}$$ hydrogen bonds between ligands, is retained in solution.