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Bis(imino)aryl NCN Pincer Cobalt Complexes: Synthesis and Disproportionation

Abstract

Treatment of iPr[NCN]Br (2,6-(2,6-iPr2C6H3C=N)2C6H3Br) with nBuLi in THF and subsequent addition of 1 equiv of CoCl2, CoCl2(Ph3P)2, or CoBr2 gave the pincer Co(II) complexes {iPr[NCN]Co(μ-Cl)}2 (1d), iPr[NCN]CoClPh3P (1d-Ph3P), and iPr[NCN]CoBr2·Li(THF)4 (1d-LiBr) respectively in moderate yields. Whereas, slow addition of the in-situ prepared iPr[NCN]Li to CoCl2 in THF afforded the unexpected mixed-valence cobalt(I/II) complex κ2C,N,η6-iPr[NCN]Co-κN-CoCl3·Li(THF)4 (2d). Complex 2d was probably formed via a disproportionation reaction of the iPr[NCN]Co(II) species with excess CoCl2 during the reaction. Nevertheless, addition of CoCl2 to the in-situ formed 1d-THF at room temperature did not led to 2d but gave a trinuclear Co(II) complex {iPr[NCN]Co(μ-Cl)(μ-Br/Cl)}2Co (1d-CoCl2) in moderate yield. Similar reactions using ligands containing small ortho groups in imine moieties R[NCN]Br (2,6-(2,6-Me2C6H3C=N)2C6H3Br, Me[NCN]Br; 2,6-(2,6-Et2C6H3C=N)2C6H3Br, Et[NCN]Br; 2,6-(2,4,6-Me3C6H2C=N)2C6H3Br, Mes[NCN]Br) and CoBr2, regardless of the reactant addition manner, afforded the mixed-valence cobalt(I/II) complexes {κ2C,N,η6-R[NCN]Co-κN-CoBr(μ-Br)}2 (Me[NCN] (2a), Et[NCN] (2b), Mes[NCN] (2c)) suggesting that the bulkiness of ortho-group in imine moieties of the ligands plays an important role in the disproportionation reaction. In the present of PMe3, the Co(II) complexes κ2C,N-R[NCN]CoBr(PMe3)2 (3a–3d) and the bisligated cobalt(II) complex κ3N,C,N-κ2C,N-iPr[NCN]2CoPMe3 (4d) can be prepared respectively in high yields. The molecular structures of 1d-LiBr, 1d-CoCl2, 2b, 2d, 3a, and 4d were confirmed by X-ray crystallographic analysis and the detailed mechanisms of the disproportionation reaction were proposed.

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Article information


Submitted
28 Feb 2020
Accepted
25 Mar 2020
First published
25 Mar 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

Bis(imino)aryl NCN Pincer Cobalt Complexes: Synthesis and Disproportionation

W. Gao, L. C. Huang, J. Zhang, T. Jia and Y. Mu, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT00747A

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