Issue 9, 2014

Two- and three-coordinate formal iron(i) compounds featuring monodentate aminocarbene ligands

Abstract

Bulky monodentate aminocarbene ligands, IMes and Me2-cAAC (IMes: 1,3-bis(2′,4′,6′-trimethylphenyl)imidazol-2-ylidene; Me2-cAAC: 3,3,5,5-tetramethyl-1-(2′,6′-diisopropylphenyl)pyrrolidine-2-ylidene), have been shown to be effective in supporting formal 13- and 11-electron iron(I) species. From the reactions of ferrous precursors and one equivalent of a reducing agent, three-coordinate complexes of the type [L2FeCl] (L = IMes or Me2-cAAC) have been synthesized in good yields. A mixed-ligand complex [(IMes)(Me2-cAAC)FeCl] was prepared from the ligand substitution reaction of [(IMes)2FeCl] with Me2-cAAC. All of the three-coordinate iron complexes can react with Na[BArF]4, from which a two-coordinate species [(Me2-cAAC)2Fe][BArF4] has been isolated. Single-crystal X-ray diffraction studies established their molecular structures to be the first examples of two- and three-coordinate formal iron(I) species supported by carbene ligands. The large solution magnetic moments, differentiated Fe–C(carbene) distances and 57Fe Mössbauer isomer shifts are indicative of their rich electronic properties.

Graphical abstract: Two- and three-coordinate formal iron(i) compounds featuring monodentate aminocarbene ligands

Supplementary files

Article information

Article type
Research Article
Submitted
26 jun 2014
Accepted
11 jul 2014
First published
15 jul 2014

Org. Chem. Front., 2014,1, 1040-1044

Two- and three-coordinate formal iron(I) compounds featuring monodentate aminocarbene ligands

Z. Mo, Z. Ouyang, L. Wang, K. L. Fillman, M. L. Neidig and L. Deng, Org. Chem. Front., 2014, 1, 1040 DOI: 10.1039/C4QO00175C

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