Tsui Emily Y, Agapie Theodor
Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E. California Blvd. MC 127-72 Pasadena, CA 91125.
Polyhedron. 2014 Dec 14;84:103-110. doi: 10.1016/j.poly.2014.06.041. Epub 2014 Jul 2.
A binucleating bis(N-heterocyclic carbene) ligand was designed as a means to coordinate and proximally constrain two transition metal centers. Using an imidazopyridine-based NHC afforded a framework structurally related to previously reported -terphenyl diphosphines. Bimetallic copper, cobalt, and nickel complexes supported by this framework were synthesized and structurally characterized. Strong interactions between the metal centers and the central arene were observed in all nickel complexes. Dinickel(0) complexes of this ligand framework were found to react with CO to form a dicarbonyl-bridged dinickel(0) product, demonstrating facile CO reduction.
设计了一种双核双(N-杂环卡宾)配体,作为配位和近程约束两个过渡金属中心的一种手段。使用基于咪唑并吡啶的NHC提供了一个与先前报道的三联苯二膦结构相关的骨架。合成并对由该骨架支撑的双金属铜、钴和镍配合物进行了结构表征。在所有镍配合物中均观察到金属中心与中心芳烃之间的强相互作用。发现该配体骨架的二镍(0)配合物与CO反应形成二羰基桥连的二镍(0)产物,证明了CO还原反应的简便性。