Reactivity of [Ru _4(μ-H) _4(CO) _(12)] with bidentate ligands containing at least one N-heterocyclic carbene moiety

摘要

The tetraruthenium carbonyl cluster complexes [Ru _4(μ-H) _4(κ ~2-L ~n)(CO) _(10)], which contain a ditopic ligand (L ~n) in which an N-heterocyclic carbene moiety is combined with a thioether (L ~1), a phosphine (L ~2 and L ~3), an NHC (L ~4), or a pyridine (L ~5 and L ~6) fragment, have been prepared by treating [Ru _4(μ-H) _4(CO) _(12)] with the corresponding ligand. In these compounds, the ditopic ligand chelates a ruthenium atom that is also attached to three hydrides. In the reactions involving L ~1, L ~2 and L ~3, an ionic species, identified as [HL ~n] ~+ [Ru _4(μ-H) _3(CO) _(12)] ~-, has been recognized as a reaction intermediate.