Cu(<scp>i</scp>) complex bearing a PNP-pincer-type phosphaalkene ligand with a bulky fused-ring Eind group: properties and applications to FLP-type bond activation and catalytic CO<sub>2</sub> reduction
作者:Katsuhiko Takeuchi、Yuto Tanaka、Ippei Tanigawa、Fumiyuki Ozawa、Jun-Chul Choi
DOI:10.1039/d0dt00276c
日期:——
complex with less-bulky Mes* instead of Eind groups. DFT calculations using model compounds revealed that the higher Lewis acidity of 2 compared to 3 is not due to the electronic effects of the ligand, but due to a reduction in the LUMO energy caused by the steric effect of the bulky Eind groups. When combined with a tertiary amine, the highly Lewis acidic and bulky 2 exhibits the reactivity of a frustrated
在这里,我们报道了[Cu(Eind2-BPEP)] [PF6](2)的合成(Eind2-BPEP = 2,6-双(2-Eind-2-磷乙烯基)吡啶,Eind = 1,1,3, 3,5,5,7,7-八乙基-1,2,3,5,6,7-六氢-s-indacen-4-yl),三配位的Cu(i)配合物,带有PNP-pincer-具有庞大的稠合环Eind基团的2型磷烯配体。Gutmann-Beckett测试表明,络合物2具有较高的路易斯酸性,强度可与强度相对较高的路易斯酸B(C6F5)3相媲美。另外,2比[Cu(Mes * 2-BPEP)] [PF6](3)更路易斯酸性(3)是类似的配合物,具有较小的Mes *而不是Eind基团。使用模型化合物进行的DFT计算表明,2的路易斯酸度比3的更高,不是由于配体的电子效应,而是由于庞大的Eind基团的空间效应引起的LUMO能量降低。当与叔胺结合时,高度路易斯酸性