Jump to main content
Jump to site search

Issue 11, 2014
Previous Article Next Article

Iron(II) complexes of ditopic carbanionic carbenes

Author affiliations


Reaction of dimesityliron(II) (Fe2(mes)4) with the N-heterocyclic carbenes 1,3-bis(2,6-diisopropylphenyl)-imidazol-2-ylidene (IPr) and 1,3-bis(2,6-dimethylphenyl)hexahydropyrimidin-2-ylidene (6-Xyl) afforded the novel trigonal planar complexes [Fe(IPr)(mes)2] (1) and [Fe(6-Xyl)(mes)2] (2), respectively. Both species were structurally characterized by single crystal X-ray diffraction and display structures and magnetic responses consistent with a quintet ground state (S = 2). Reaction of 1 with KC8 in THF afforded K+ salts of the anionic complex [{:C[N(2,6-iPr2C6H3)]2(CH)C}2Fe(mes)] (3) and the homoleptic organometallic anion [Fe(mes)3] (4). By contrast, reduction of 2 resulted in extensive decomposition and intractable product mixtures. Complex 3 is coordinated by two ditopic carbanionic carbenes via the C4/C5 position while the C2 position retains unquenched carbenic character and remains vacant for further coordination. This was corroborated by reacting solutions of 3 with one and two equivalents of triethylaluminium (AlEt3) which resulted in the formation of [{Et3Al:C[N(2,6-iPr2C6H3)]2(CH)C}{:C[N(2,6-iPr2C6H3)]2(CH)C}Fe(mes)] (5) and [{Et3Al:C[N(2,6-iPr2C6H3)]2(CH)C}2Fe(mes)] (6), respectively. Both of these species were structurally characterized as [K(2,2,2-crypt)]+ salts.

Graphical abstract: Iron(ii) complexes of ditopic carbanionic carbenes

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Sep 2013, accepted on 14 Oct 2013 and first published on 16 Oct 2013

Article type: Paper
DOI: 10.1039/C3DT52638K
Dalton Trans., 2014,43, 4335-4344

  •   Request permissions

    Iron(II) complexes of ditopic carbanionic carbenes

    R. A. Musgrave, R. S. P. Turbervill, M. Irwin, R. Herchel and J. M. Goicoechea, Dalton Trans., 2014, 43, 4335
    DOI: 10.1039/C3DT52638K

Search articles by author