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)=CH2]2 (>1) and Zn[C(H)=CMe2]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)=CH2]2 (>1·>bipy), (tmeda)Zn[C(Me)=CH2]2 (>1·>tmeda), (bipy)Zn[C(H)=CMe2]2 (>2·>bipy), and (tmeda)Zn[C(H)=CMe2]2 (>2·>tmeda), of which (>1·>bipy), (>2·>bipy), and (>2·>tmeda) have been characterized crystallography.