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DOI: 10.1039/A903103K (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 2743-2749

Synthesis and characterisation of [Ru6C(CO)14] cluster complexes of some [2.2]- and [2.2.2]-cyclophane ligands

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Paul Schooler, Brian F. G. Johnson, Laura Scaccianoce and Rosemary Tregonning

Abstract

Some [Ru6C(CO)14] cluster complexes bearing the [2.2]ortho-, anti-[2.2]meta- and [2.2.2]para-cyclophane ligands have been prepared, isolated and characterised. The molecular structure of two new compounds [Ru6C(CO)14(meta-C16H16)] 2 and [Ru6C(CO)14(para-C24H24)] 4 have been established by X-ray diffraction studies which show that the cyclophane ligands are bound in an apical η6 mode in both cases. This is at variance with the face-capping µ3-η2∶η2∶η2 mode observed in the previously reported structure of [Ru6C(CO)14(para-C16H16)] 1. Spectroscopic evidence obtained for [Ru6C(CO)14(ortho-C16H16)] 3 suggests that the cyclophane ligand is bound in an apical η6 mode too. The synthesis of 1 via the redox coupling of [Ru5C(CO)14]2– with [Ru(η6-C16H16)(NCMe)3]2+ is presented as an alternative to the thermolysis of [Ru3(CO)12] with [2.2]paracyclophane in heptane.

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