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Probing the potential of metalla-N-heterocyclic carbenes towards activation of enthalpically strong bonds.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-06-22 , DOI: 10.1039/d0dt01363c
Bijoy Ghosh 1 , Ashwini K Phukan 1
Affiliation  

Density functional theory calculations are employed to explore the reactivity of metalla-N-heterocyclic carbenes (MNHCs) towards activation of a variety of small molecules (H2, NH3, PH3, SiH3Ph and CH4). All the MNHCs considered are found to have a stable singlet ground state and possess suitable electronic properties for their application in small molecule activation. The calculated energy barriers of E–H (E = H, C, N, Si, P) activation for the MNHCs are found to be in agreement with those of the experimentally evaluated cyclic alkyl(amino)carbene (CAAC) and diamidocarbenes (DACs), thereby indicating the activating effect of the incorporation of an ancillary metal center within a cyclic NHC, and highlighting a new, underexplored strategy in achieving difficult bond activations with carbenes.

中文翻译:

探索金属-N-杂环卡宾对激活焓强键的潜力。

密度泛函理论计算用于探索金属-N-杂环卡宾(MNHCs)对多种小分子(H 2,NH 3,PH 3,SiH 3 Ph和CH 4)活化的反应性)。发现所有考虑的MNHC具有稳定的单线态基态,并具有适合其在小分子活化中应用的电子特性。发现为MNHCs计算的E–H(E = H,C,N,Si,P)活化能垒与实验评估的环状烷基(氨基)碳烯(CAAC)和二酰胺基碳烯(DACs)的能垒一致),从而表明在环状NHC中并入辅助金属中心的激活效果,并突出了一种新的,尚未开发的策略,可实现与碳烯的困难键激活。
更新日期:2020-07-17
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