Evidence of the Lewis-Amphoteric Character of Tris(pentafluoroethyl)silanide, [Si(C₂ F₅ )₃ ].

ABSTRACT: According to a first view on the geometrical and electronic structure of the tris(pentafluoroethyl)silanide, this anion appears as a Lewis base. Quantum chemical calculations on perfluoroalkylated silanides show significantly lower HOMO and LUMO energy levels in comparison to their non-fluorinated counterparts, which implies reduced Lewis basicity and increased Lewis acidity of the [Si(C₂ F₅ )₃ ]^- ion. With these findings and a HOMO-LUMO gap of 4.80 eV similar to N-heterocyclic silylenes (NHSis), perfluoroalkyl silanides are predestined to exhibit Lewis-amphoteric character similar to silylenes. Deprotonation of Si(C₂ F₅ )₃ H with sterically demanding phosphazene bases afforded thermally stable phosphazenium salts

SUBMITTER: Tiessen N 

PROVIDER: S-EPMC8252080 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature