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-Me 2-1,2,4-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-RuC 2B9H11] (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-Me 2-1,2,4-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].
|Number of pages||6|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - 1985|
ASJC Scopus subject areas