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Issue 35, 2012
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[XIm][FeI(CO)3(SnI3)2] (XIm: EMIm, EHIm, PMIm) containing a barbell-shaped FeSn2-carbonyl complex

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By reacting Fe(CO)5 and SnI4 in the ionic liquids [XIm][NTf2] (XIm: 1-ethyl-3-methylimidazolium/EMIm, 1-ethyl-imidazolium/EHIm, 1-propyl-3-methylimidazolium/PMIm; NTf2: bistrifluoridomethansulfonimide), the compounds [XIm][FeI(CO)3(SnI3)2] are obtained as transparent, dark red crystals. According to single-crystal structure analysis, the title compounds crystallize monoclinically and contain the anionic carbonyl complex [FeI(CO)3(SnI3)2] as well as [EMIm]+, [EHIm]+ or [PMIm]+ cations. The anionic carbonyl is composed of a Sn–Fe–Sn barbell-shaped building unit with Fe–Sn distances of 252.0(1) pm. Herein, tin is coordinated distorted tetrahedrally by iodine; iron is coordinated pseudo-octahedrally by three carbonyl ligands, one iodine atom and two tin atoms. Bonding situation and valence state are investigated in detail for [EMIm][FeI(CO)3(SnI3)2] based on bond-lengths considerations, infrared spectroscopy, Mössbauer spectroscopy, density functional theory and DFT-based Mulliken population analysis. Hence, the formal oxidation state of the metal atoms can be concluded to Fe±0 and Sn3+.

Graphical abstract: [XIm][FeI(CO)3(SnI3)2] (XIm: EMIm, EHIm, PMIm) containing a barbell-shaped FeSn2-carbonyl complex

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Publication details

The article was received on 11 Jun 2012, accepted on 12 Jul 2012 and first published on 12 Jul 2012

Article type: Paper
DOI: 10.1039/C2DT31253K
Citation: Dalton Trans., 2012,41, 10605-10611
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    [XIm][FeI(CO)3(SnI3)2] (XIm: EMIm, EHIm, PMIm) containing a barbell-shaped FeSn2-carbonyl complex

    S. Wolf, F. Winter, R. Pöttgen, N. Middendorf, W. Klopper and C. Feldmann, Dalton Trans., 2012, 41, 10605
    DOI: 10.1039/C2DT31253K

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