Pnicogen bonds, which are weak noncovalent interactions (NCIs), can be significantly modified by the presence of beryllium bonds, one of the strongest NCIs known. We demonstrate the importance of this influence by studying ternary complexes in which both NCIs are present, that is, the ternary complexes formed by a nitrogen base (NH, NHCH, and NCH), a phosphine (fluorophosphane, PHF) and a beryllium derivative (BeH, BeF, BeCl, BeCO, and BeSO). Energies, structures, and nature of the chemical bonding in these complexes are studied by means of computational methods. The pnicogen bond between the nitrogen base and the phosphine and the beryllium bond between the fluorine atom of fluorophosphane and the beryllium derivative show large cooperativity effects both on energies and geometries, with dissociation energies up to 296 kJ mol and cooperativity up to 104 kJ mol in the most strongly bound complex, CHHN:PHF:BeSO. In the complexes between the strongest nitrogen bases and the strongest beryllium donors, phosphorus-shared and phosphorus-transfer bonds are found.
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