Structural Diversity of Copper(I)–N‐Heterocyclic Carbene Complexes; Ligand Tuning Facilitates Isolation of the First Structurally Characterised Copper(I)–NHC Containing a Copper(I)–Alkene Interaction
作者:Benjamin R. M. Lake、Charlotte E. Willans
DOI:10.1002/chem.201301896
日期:2013.12.2
The ligands have been coordinated to a copper(I) centre and the resulting copper(I)–NHC (NHC=N‐heterocyclic carbene) complexes have been thoroughly examined, both in solution and in the solid‐state. The solid‐state structures are highly diverse and exhibit a range of unusual geometries and cuprophilic interactions. The first structurally characterised copper(I)–NHC complex containing a copper(I)–alkene
据报道,制备了一系列带有N-烯丙基取代基的咪唑鎓盐,以及第二个氮原子上具有不同电子和空间特性的一系列取代基。配体已经与铜(I)中心配位,并且在溶液和固态下都对生成的铜(I)-NHC(NHC = N-杂环卡宾)络合物进行了全面检查。固态结构非常多样,并表现出一系列不同寻常的几何形状和嗜铜性相互作用。据报道,第一个具有结构特征的铜(I)-NHC络合物包含铜(I)-烯烃相互作用。N-吡啶基取代基与铜(I)中心形成键,可稳定金属中心与相邻配体的烯丙基取代基之间的相互作用,从而形成一维配位聚合物。稳定的原因是吡啶基取代基增加了铜(I)中心的电子密度,从而增强了金属(d)-链烯(π*)的反向键合。此外,电荷转移以外的其他组分似乎在铜(I)-烯烃的稳定化中也起作用,因为配体的Lewis碱度的进一步提高不利于铜(I)-烯烃的结合。