Compounds of nickel in which a chain of three metal atoms is closely embraced by two interlocking heptadentate dianions derived from a chain of five pyridyl groups linked at the 2, or 2 and 6, positions by four amide nitrogen atoms are reported. This new type of extended metal atom chain (EMAC) compound differs from earlier ones in that ligand exchange at the axial positions cannot occur, because the axial ligands are part of the entire ligand. Four such compounds, all crystallographically characterized, are reported. This work is a proof-of-concept project that will be extended to other metals with these and other homologous ligands.
报道了一种
镍化合物,其特征是由两个互扣的七牙二阴离子紧密包裹着由三种
金属原子组成的链条,这些二阴离子源自于由五个
吡啶基团组成的链条,这些
吡啶基团通过四个酰胺氮原子在2位或2位和6位链接在一起。这种新型的扩展
金属原子链(
EMAC)化合物与早期的不同,因为在轴向位置的
配体交换无法发生,因为轴向
配体是整个
配体的一部分。报道了四种此类化合物,所有化合物均已进行晶体学表征。这项工作是一个概念验证项目,未来将扩展到其他
金属以及这些和其他同系
配体。