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Grabowski, Sławomir J
Molecules (Basel, Switzerland), 06/2020, Volume: 25, Issue: 11Journal Article
The second-order Møller-Plesset perturbation theory calculations with the aug-cc-pVTZ basis set were performed on complexes of triel species: BCl , BH , AlCl , and AlH acting as Lewis acids through the B or Al centre with Lewis base units: NCH, N , NH , and Cl anion. These complexes are linked by triel bonds: B/Al⋅⋅⋅N or B/Al⋅⋅⋅Cl. The Quantum Theory of ´Atoms in Molecules´ approach, Natural Bond Orbital method, and the decomposition of energy of interaction were applied to characterise the latter links. The majority of complexes are connected through strong interactions possessing features of covalent bonds and characterised by short intermolecular distances, often below 2 Å. The BCl ⋅⋅⋅N complex is linked by a weak interaction corresponding to the B⋅⋅⋅N distance of ~3 Å. For the BCl ⋅⋅⋅NCH complex, two configurations corresponding to local energetic minima are observed, one characterised by a short B⋅⋅⋅N distance and a strong interaction and another one characterised by a longer B⋅⋅⋅N distance and a weak triel bond. The tetrahedral triel structure is observed for complexes linked by strong triel bonds, while, for complexes connected by weak interactions, the structure is close to the trigonal pyramid, particularly observed for the BCl ⋅⋅⋅N complex.
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