Evidence for Metal–Surface Interactions and Their Role in Stabilizing Well-Defined Immobilized Ru–NHC Alkene Metathesis Catalysts
作者:Manoja K. Samantaray、Johan Alauzun、David Gajan、Santosh Kavitake、Ahmad Mehdi、Laurent Veyre、Moreno Lelli、Anne Lesage、Lyndon Emsley、Christophe Copéret、Chloé Thieuleux
DOI:10.1021/ja311722k
日期:2013.2.27
Secondary interactions are demonstrated to direct the stability of well-defined Ru-NHC-based heterogeneous alkene metathesis catalysts. By providing key stabilization of the active sites, higher catalytic performance is achieved. Specifically, they can be described as interactions between the metal center (active site) and the surface functionality of the support, and they have been detected by surface-enhanced
二次相互作用被证明可以指导明确定义的基于 Ru-NHC 的多相烯烃复分解催化剂的稳定性。通过提供活性位点的关键稳定性,实现更高的催化性能。具体来说,它们可以被描述为金属中心(活性位点)和载体表面功能之间的相互作用,并且它们已经被配体的表面增强(1)H-(29)Si NMR光谱检测到,和(31 )P 催化剂前体的固态 NMR。只有当金属中心通过柔性接头(丙基)连接到表面时,它们才存在,这允许活性位点与底物反应或可逆地松弛到表面,从而提供稳定性。相比之下,