Pnictogen effects on the electronic interactions in the Lewis pair complexes Ph3EB(C6F5)3 (E = P, As, Sb)

Lewis pair complexes bearing a BR3 acid and a R'E-3 base (E = P, As, Sb; R, R' - organic ligands) play key roles in modern chemistry and technology, their properties being strongly relevant to catalysis and material science. The donor acceptor complexes Ph3EB(C6F5)(3) attract special interest due to the elongated E-B bond that shifts the molecular parameters towards those of a frustrated Lewis pair. In depth theoretical and experimental studies of the Ph3EB(C6F5)(3) systems presented in this work provide new insights into the nature of intramolecular electronic interactions in these molecules. A missing X-ray structure of Ph3AsB(C6F5)(3) is described. Analyses of molecular structures, orbitals, dissociation energies and electron density distributions reveal crucial influence of non-covalent interactions on the Ph3EB(C6F5)(3) stability. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Lewis pairs bearing a BR3 acid and a R'E-3 base play key roles in catalysis and material science. The Ph3EB(C6F5)(3) complexes with elongated E-B bond shift molecular parameters towards those of a frustrated Lewis pair. The study provides new insights into intramolecular electronic interactions and the crucial influence of non-covalent interactions on stability.