Coordination-Induced N–H Bond Weakening in a Molybdenum Pyrrolidine Complex: Isotopic Labeling Provides Insight into the Pathway for H<sub>2</sub> Evolution
作者:Máté J. Bezdek、István Pelczer、Paul J. Chirik
DOI:10.1021/acs.organomet.0c00471
日期:2020.8.24
pyrrolidine in [(PhTpy)(PPh2Me)2Mo(NH(pyrr))][BArF24] ([1-NH(pyrr)]+; PhTpy = 4′-Ph-2,2′,6′,2″-terpyridine, NH(pyrr) = pyrrolidine, ArF24 = [C6H3-3,5-(CF3)2]4) was determined to be between 41 and 51 kcal mol–1 by thermochemical analysis and supported by a density functional theory (DFT) computed value of 48 kcal mol–1. The complex [1-NH(pyrr)]+ underwent proton-coupled electron transfer (PCET) to 2,4,6-tr
阳离子钼吡咯烷配合物的合成和表征被描述为显示出显着的配位诱导的NH键弱化。[[ Ph Tpy)(PPh 2 Me)2 Mo(NH(pyrr))] [BArF 24 ]([1-NH(pyrr)] +中的配位吡咯烷的N–H键解离自由能(BDFE);Ph Tpy = 4'-Ph-2,2',6',2''-吡啶,NH(pyrr)=吡咯烷,ArF 24 = [C 6 H 3 -3,5-(CF 3)2 ] 4)为确定在41至51 kcal mol –1之间通过热化学分析并得到密度泛函理论(DFT)的支持,计算值为48 kcal mol –1。复杂的[1-NH(吡咯)] +后行质子偶联电子转移(PCET)2,4,6-三-叔-butylphenoxyl基团,以及自发ħ 2在温和加热演化以提供相应的钼吡咯烷络合物[(Ph Tpy)(PPh 2 Me)2 Mo(N(pyrr))] [BArF 24 ]([1-N(pyrr)]