Bis[(μ‐iodo)iodo‐η‐cyclopentadienylruthenium(III)], ‘CpRuI2’ = [CpRuI2]2: a Further Example of a [CpXM(μ‐X)2MXCp] Parent with cis Arrangement

Abstract

AbstractThe very limited array of (structurally described) adducts of the form [CpMX2]2 ≡ [CpMX(μ‐X)2MXCp] with the unsubstituted/parent Cp (≡ C5H5, cyclopentadienyl) ligand is augmented by a study of [CpIRu(μ‐I)2RuICp], found to be isotypic with the recently described chloride and, with it, providing the only examples of such dimers in their ‘cis’ form, i.e., the terminal‐X and Cp pairs to the same side of the Ru2(μ‐X)2 arrays, which are appreciably folded at the X···X lines, with the short Ru···Ru distances (2.7748(6) (X = Cl), 2.9034(8) Å (X = I)), consistent with the presence of appreciable metal‐metal bonding (cf. the M = Cr, X = Cl counterpart which is trans, Cr···Cr 3.3447(8) Å).