作者:Fioralba Taullaj、David Armstrong、Alan J. Lough、Ulrich Fekl
DOI:10.1016/j.poly.2015.08.023
日期:2016.3
Iridium complexes of two different nitrogen-donor-functionalized fluorenyl ligands have been, synthesized and characterized, (LIr)-Ir-1(COD) and (LIr)-Ir-2(COD), where L1- = [9-(2-dimethylamino)ethyl]fluorenyl anion, L2- = [9-(2-ortho-pyridyl)ethyl]fluorenyl anion, and COD = 1,5-cyclooctadiene. The structures of both ligands (in their protonated form) and of both complexes were determined by single-crystal X-ray crystallography. Structural consequences of the nature of the nitrogen ligand (dimethylamino substituent versus ortho-pyridyl substituent) are significantly different Ir-N distances (shorter for (LIr)-Ir-2 (COD)) and indirect cis-influence on the COD ligand resulting in a shorter Ir-olefin bond cis to the nitrogen donor in (LIr)-Ir-2(COD). Both complexes act as precatalysts for arene hydrogenation. (C) 2015 Elsevier Ltd. All rights reserved.
Benzene hydrogenation: an isotopic transient study