The York Research Database

We have prepared nido-7,8,9,11-Sb₂C₂B₇H₉, the first cluster with simultaneous Sb-B, Sb-C and Sb-Sb atom pairs with interatomic separations with magnitudes that approach the respective sums of covalent radii. However, the length of the Sb-Sb separation in this cluster is slightly less than the sum of the covalent radii. Quantum chemical analysis has revealed that the crystal packing of nido-7,8,9,11-Sb₂C₂B₇H₉ is predominantly dictated by pnictogen (Pn) bonding, an unconventional σ-hole interaction. Indeed, the interaction energy of a very strong Sb₂⋯H-B Pn-bond in the nido-7,8,9,11-Sb₂C₂B₇H₉ dimer exceeds -6.0 kcal mol^-1. This is a very large value and is comparable to the strengths of known Pn-bonds in Cl₃Pn⋯π complexes (Pn = As, Sb).