Metallaborane Chemistry. 14. Icosahedral 6-arene carbametallaboranes of iron and ruthenium

Garcia, Maria P. and Green, Michael and Stone, F. Gordon A. and Somerville, Richard G. and Welch, Alan J. and Briant, Clive E. and Cox, David and Mingos, D. Michael P. (1985) Metallaborane Chemistry. 14. Icosahedral 6-arene carbametallaboranes of iron and ruthenium. Dalton Transactions, 1985 (11). pp. 2343-2348. ISSN 1477-9226

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Icosahedral 2,4-dicarba-1-ferraboranes with η6-bonded benzene, toluene, o-xylene, or naphthalene ligands have been synthesised in moderate yields by reaction of [Fe(cod)(η5-C5H5)](cod = cyclo-octa-1,5-diene) with 2,3-Me2-2,3-C2B9H9 in the presence of the appropriate arene. In addition, the toluene derivative, closo-[1-(η6-C6H5Me)-2,4-Me2-1,2,4-FeC2B9H9](2), has also been obtained by treatment of the carbaborane with [Fe2(µ-η-C6Me6)(η5-C5H5)2] in toluene. Reaction of [RuCl2(η6-C6H6)2] with Tl[TlC2B9H11] affords closo-[3-(η6-C6H6)-3,1,2-RuC2B9H11](7). Complexes (2) and (7) have been characterised by single-crystal X-ray diffraction. Crystals of (2) are orthorhombic, space group Pna21, with a= 21.793(4), b= 8.6274(15), c= 8.636(3)Å, and Z= 4; R= 0.0499 for 1 676 reflections. Complex (7) is also orthorhombic, space group Pnam, with a= 18.477(2), b= 9.191(4), and c= 7.704(1)Å, and Z= 4; R= 0.0223 for 1 723 data. Both species have slightly distorted Icosahedral cage geometries and overall Cs molecular symmetry, space group imposed for (7). The naphthalene derivative [1-(η6-C10H8)-2,4-Me2-1,2,4-FeC2B9H9] undergoes substitution of the arene ligand by CO at 100 bar and 50 °C, to afford the complex [1,1,1-(CO)3-2,4-Me2-1,2,4 FeC2B9H9].

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Dalton Transactions
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10 Jun 2013 09:11
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18 Sep 2023 00:42