Isolation of Bis- and Mono-Cyclometallated Ru-IMes Complexes Upon Reaction of [Ru(PPh3)3HCl], IMes and ZnMe2

Anne-Frédérique Pecharman, Erika Roberts, Fedor Miloserdov, Victor Varela-Izquierdo, Mary Mahon, Michael Whittlesey

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Addition of an excess of ZnMe 2 to a mixture of [Ru(PPh 3) 3HCl] and IMes (IMes=1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene) yields the bis-cyclometallated complex, [Ru(IMes)“(PPh 3) 2] 2, together with the mono-cyclometallated, Ru−Zn heterobimetallic complex [Ru(IMes)′(PPh 3) 2(ZnMe)] 3. Treatment of 2 with H 2, PhSiH 3 or pinacolborane yields the previously reported complex, [Ru(IMes)′(PPh 3) 2H] 1, the synthesis of which has been reinvestigated. Further studies of small molecule reactivity show that 1 adds H 2 to give [Ru(IMes)(PPh 3) 2H 4] 4, whilst 2 reacts with catecholborane to give [Ru(IMes-Bcat)′(PPh 3) 2H] 5, in which (IMes-Bcat)′ signifies a borylated NHC ligand that is singly-metallated onto Ru. Treatment of 2 with CO gives the 18-electron dicarbonyl product [Ru(IMes)”(PPh 3)(CO) 2] 6. Compounds 1–3, 5 and 6 have been structurally characterised.

Original languageEnglish
Article numbere202300037
JournalEuropean Journal of Inorganic Chemistry
Early online date17 Feb 2023
Publication statusPublished - 25 Apr 2023

Bibliographical note

Engineering and Physical Sciences Research Council - EP/T019743/1
Horizon 2020 Framework Programme - 792674
MINECO/FEDER - CTQ2017-83421-P

Funding Information:
This work was supported by the EPSRC (grant EP/T019743/1 for AFP) and the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska‐Curie grant agreement No 792674 (FMM). VVI thanks MINECO/FEDER (CTQ2017‐83421‐P) and Gobierno de Aragón (GA/FEDER, Inorganic Molecular Architecture Group E08_17R) for financial support and MINECO/FEDER for a FPI fellowship. We thank Dr David Liptrot for assistance with ATR‐IR measurements and the anonymous reviewers for valuable experimental suggestions.

Publisher Copyright:
© 2023 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH GmbH.


  • C−H activation
  • carbene ligands
  • ruthenium
  • zinc

ASJC Scopus subject areas

  • Inorganic Chemistry


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