Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 26, 2019
Previous Article Next Article

Cyclometallation reactions of a three-coordinate cobalt(i) complex bearing a nonsymmetric N-heterocyclic carbene ligand

Author affiliations

Abstract

The reactions of a three-coordinate cobalt(I) complex [(IAdMes)(PPh3)CoCl] (1) (IAdMes = 1-mesityl-3-adamantyl-4,5-dimethylimidazol-2-ylidene) with LiCH3, LiCH2SiMe3 and NaCp gave ligand-based C(sp3)–H bond activation products [(IAd′Mes)Co(η6-C6H5PPh2)] (2), [(IAdMes′)(PPh3)Co(CH2SiMe3)] (4) and [(IAd′Mes)Co(η5-Cp)] (5), respectively (IAd′Mes and IAdMes′ denote adamantyl- and mesityl-cyclometallated N-heterocyclic carbene (NHC) ligands, respectively). All the cobalt–NHC complexes have been characterized by various spectroscopic methods, and their structures have been established by single-crystal X-ray diffraction studies. These cyclometallation reactions are among the rare examples of C(sp3)–H bond activation reactions observed in structurally well-defined low-valent cobalt complexes. Different cyclometallated NHC ligands ([IAd′Mes]1−versus [IAdMes′]1−) and different oxidation states of the metal center (cobalt(I) versus cobalt(II)) in the resultant cobalt complexes hint at different mechanisms for these cobalt-mediated C(sp3)–H bond activation reactions.

Graphical abstract: Cyclometallation reactions of a three-coordinate cobalt(i) complex bearing a nonsymmetric N-heterocyclic carbene ligand

Back to tab navigation

Supplementary files

Article information


Submitted
18 Feb 2019
Accepted
15 Mar 2019
First published
18 Mar 2019

Dalton Trans., 2019,48, 9676-9683
Article type
Paper

Cyclometallation reactions of a three-coordinate cobalt(I) complex bearing a nonsymmetric N-heterocyclic carbene ligand

Y. Gao, Q. Chen, X. Leng and L. Deng, Dalton Trans., 2019, 48, 9676
DOI: 10.1039/C9DT00731H

Social activity

Search articles by author

Spotlight

Advertisements