Iridium and Ruthenium Complexes of <i>N</i>-Heterocyclic Carbene- and Pyridinol-Derived Chelates as Catalysts for Aqueous Carbon Dioxide Hydrogenation and Formic Acid Dehydrogenation: The Role of the Alkali Metal
作者:Sopheavy Siek、Dalton B. Burks、Deidra L. Gerlach、Guangchao Liang、Jamie M. Tesh、Courtney R. Thompson、Fengrui Qu、Jennifer E. Shankwitz、Robert M. Vasquez、Nicole Chambers、Gregory J. Szulczewski、Douglas B. Grotjahn、Charles Edwin Webster、Elizabeth T. Papish
DOI:10.1021/acs.organomet.6b00806
日期:2017.3.27
reported previously. All new complexes were fully characterized by spectroscopic and analytical methods and by single-crystal X-ray diffraction for 1, 2, 3, 5Ir , and for two [Ag(NHC-pyOR)2]OTf complexes 6 (R = t Bu) and 7 (R = Me). The aqueous catalytic studies of both CO2 hydrogenation and formic acid dehydrogenation were performed with catalysts 1-5. In general, NHC-pyOR complexes 1-3 were modest precatalysts
氢化反应可用于以化学键存储能量,如果这些反应是可逆的,则可以按需释放能量。一些最有效的用于CO2加氢的过渡金属催化剂具有质子响应特征和金属-羟基-吡啶-2-醇基配体(例如6,6'-二羟基联吡啶(6,6'-dhbp))。配体双功能催化。我们旨在比较基于双齿吡啶-2-醇的配体与具有与吡啶-2-醇结合的N杂环卡宾(NHC)的新型支架。为此,我们合成了一系列[Cp * Ir(NHC-pyOR)Cl] OTf配合物,其中R = t Bu(1),H(2)或Me(3)。为了进行比较,我们测试了类似的Bipy衍生的铱络合物作为催化剂,特别是[Cp * Ir(6,6'-dxbp)Cl] OTf,其中x =羟基(4Ir)或甲氧基(5Ir);以前曾报道过4Ir,但5Ir是新的。还使用[(η6-cymene)Ru(6,6'-dxbp)Cl] OTf测试了类似的钌配合物,其中x =羟基(4Ru)或甲氧基(5Ru);