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Half-sandwich iron(II) complexes with protic acyclic diaminocarbene ligands: synthesis, deprotonation and metalation reactions

Abstract

A variety of half-sandwich iron(II) complexes with diprotic acyclic diaminocarbene ligands (pADCs) has been obtained by reaction of the cationic complexes [Fe(Cp)(CO)2(CNR)]+ and [Fe(Cp)(CO)(CNR)2]+ with methylamine, and their acid-base behaviour studied revealing easy reversible deprotonation reaction of both N-H moieties of the carbene ligands. The deprotonation process is frequently followed by a nucleophilic attack of the nitrogen atom to a vicinal carbonyl or isocyanide ligand, affording the corresponding metallacycles. Metalation of one or two N-H groups of the pADC ligands can be accomplished by reaction of the carbene complexes with either [AuCl(PPh3)] or [Ru(p-cym)Cl2]2 in the presence of KOH or LiHMDS as deprotonating agents. A number of Fe(II)/Au(I) and Fe(II)/Ru(II) heterometallic complexes have been prepared in this way, some of them formally containing unique metalla-N-heterocyclic carbene ligands.

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Publication details

The article was received on 05 Jun 2017, accepted on 12 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT02049J
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Half-sandwich iron(II) complexes with protic acyclic diaminocarbene ligands: synthesis, deprotonation and metalation reactions

    J. Ruiz, L. García, M. Vivanco, D. Sol and S. Garcia-Granda, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02049J

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