Unprecedented Alkene Complex of Zinc(Ⅱ): Structures and Bonding of Divinylzinc Complexes

摘要

This report describes the solid-state structures of a series of divinylzinc complexes, one of which represents the only structurally characterized zinc(Ⅱ) π -complex. Vinylzinc reagents, Zn[C(Me)=CH_2]_2 (1) and Zn[C(H)=CMe_2]_2 (2), have been synthesized and isolated as white crystalline solids in 66 and 72% yield, respectively. Each compound exhibits an infinite polymeric architecture in the solid state via a series of zinc-π (1) and zinc-σ-bonded (2) bridging interactions. Addition of chelating ligands to these divinylzinc compounds allowed isolation of the monomeric adducts (bipy)Zn[C(Me)=CH_2]_2 (1·bipy), (tmeda)Zn[C(Me)= CH_2]_2 (1·tmeda), (bipy)Zn[C(H)=CMe_2]_2 (2·bipy), and (tmeda)Zn[C(H)=CMe_2]_2 (2·tmeda), of which 1·bipy, 2·bipy, and 2·tmeda have been characterized crystallographically.