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Synthesis and molecular structure of the organometallic zwitterion (η5-C5H3MeBCl3)Fe(CO)3: evidence for alternative sites of nucleophilicity within the [(η5-C5R5)Fe(CO)2 − anion

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Abstract

The organometallic zwitterion (η5-C5H3MeBCl3)Fe(CO)3 (2) is isolated as a minor product from the reaction between the sodium salt of the anion [(η5-C5H4Me)Fe(CO)2]− and boron trichloride. The crystal structure of 2 [P21/n, a = 7.3927(5) Å, b = 13.8027(9) Å, c = 12.2759(9) Å, α =γ = 90°, β = 92.517(3)°] features discrete molecules in which the coordination sphere of the iron center comprises three carbonyls and a novel (η 5-C5H3MeBCl3) ligand, derived from attack of BCl3 on the (η 5-C5H4Me) moiety of the parent compound. The isolation of 2 confirms that the nucleophilic properties of organometallic anions of the type [(η 5-C5R5)M(CO) n ]− (M = Fe, Ru, n = 2; M = Mo, W, n = 3) are not confined to the metal center, or to the carbonyl oxygens (examples of which have previously been reported) but also encompass the cyclopentadienyl ligand.

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Authors and Affiliations

  1. Department of Chemistry, Cardiff University, P.O. Box 912, Park Place, Cardiff, United Kingdom, CF10 3TB

    Simon Aldridge & Richard J. Calder

  2. Department of Chemistry, University of Southampton, Highfield, Southampton, United Kingdom, SO17 1BJ

    Simon J. Coles & Michael B. Hursthouse

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  1. Simon Aldridge
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  2. Richard J. Calder
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  3. Simon J. Coles
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  4. Michael B. Hursthouse
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Correspondence to Simon Aldridge.

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Aldridge, S., Calder, R.J., Coles, S.J. et al. Synthesis and molecular structure of the organometallic zwitterion (η5-C5H3MeBCl3)Fe(CO)3: evidence for alternative sites of nucleophilicity within the [(η5-C5R5)Fe(CO)2 − anion. Journal of Chemical Crystallography 33, 805–808 (2003). https://doi.org/10.1023/A:1026167626120

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