Unprecedented Alkene complex of Zinc(II):Structures and bonding of divinylzine 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(ll) pi-complex.Vinylzinc reagents,ZnC(Me)=CH_2_2 (1) and ZnC(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-pi (1) and zinc-sigma-bonded (2) bridging interactions.Addition of chelating ligands to these divinylzinc compounds allowed isolation of the monomeric adducts (bipy)ZnC(Me)=CH_2_2 (1 centre dot bipy),(tmeda)ZnC(Me)= CH_2_2 (1 centre dot tmeda),(bipy)ZnC(H)=CMe_2_2 (2 centre dot bipy),and (tmeda)ZnC(H)=CMe_2_2 (2 centre dot tmeda),of which 1 centre dot bipy,2 centre dot bipy,and 2 centre dot tmeda have been characterized crystallographically.