A Neutral "Aluminocene" Sandwich Complex: η¹ - versus η⁵ -Coordination Modes of a Pentaarylborole with ECp* (E=Al, Ga; Cp*=C₅ Me₅ ).

ABSTRACT: The pentaaryl borole (Ph*C)₄ BXyl^F [Ph*=3,5-tBu₂ (C₆ H₃ ); Xyl^F =3,5-(CF₃ )₂ (C₆ H₃ )] reacts with low-valent Group 13 precursors AlCp* and GaCp* by two divergent routes. In the case of [AlCp*]₄ , the borole reacts as an oxidising agent and accepts two electrons. Structural, spectroscopic, and computational analysis of the resulting unprecedented neutral η⁵ -Cp*,η⁵ -[(Ph*C)₄ BXyl^F ] complex of Al^III revealed a strong, ionic bonding interaction. The formation of the heteroleptic borole-cyclopentadienyl "aluminocene" leads to significant changes in the ¹³ C NMR chemical shifts within the borole unit. In the

SUBMITTER: Sindlinger CP 

PROVIDER: S-EPMC6856865 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature