Synthesis of N-heterocyclic carbene silver and palladium complexes bearing bis(pyrazol-1-yl)methyl moieties
作者:Qiang Li、Yun-Fu Xie、Bao-Chuan Sun、Jun Yang、Hai-Bin Song、Liang-Fu Tang
DOI:10.1016/j.jorganchem.2013.07.055
日期:2013.11
respectively, an obvious difference among them is present. L″ prefers to coordinate to two silver atoms in a head (carbene)–to tail (nitrogen) coordination mode, while L and L′ show head (carbene)–to head (carbene) and tail (nitrogen)–to tail (nitrogen) coordination modes to two silver atoms. Additionally, these silver complexes exhibit good catalytic activity in the three-component coupling reaction of alkyne
N- [双(吡唑-1-基)甲基]苯基-N′-苄基咪唑鎓和N- [双(吡唑-1-基)甲基]苯氧基衍生的一系列N-杂环卡宾(NHC)银和钯配合物已合成了-甲基-N'-苄基咪唑鎓盐,并通过元素分析,NMR光谱和单晶X射线衍射对其进行了表征。由双(吡唑-1-基)甲基官能化的NHC在这些配合物中显示出三种不同的配位模式。N- [双(吡唑-1-基)甲基]苯基-N′-苄基咪唑-2-亚烷基(L)和N- [双(3,5-二甲基吡唑-1-基)甲基]苯基-N′-苄基咪唑-2-亚烷基(L′)通过卡宾碳在阳离子配合物[L 2 Ag] [AgCl 2 ]和[L' 4 Ag 3 Br 2 ] [AgBr 2 ]中作为单齿配体。在大环配合物L' 2 Pd 2 Br 2中观察到通过一个吡唑基氮和卡宾碳连接到两个钯中心的[C,N]双齿双键配位模式。而在配位聚合物[L 2 Ag 2 ] n [PF 6 ] 2 n和大环络合物[L'