Bis[(μ-iodo)iodo-η-cyclopentadienylruthenium(III)], 'CpRuI₂' = [CpRuI₂]₂: a further example of a [CpXM(μ-X)₂MXCp] parent with cis arrangement

Abstract

<jats:title>Abstract</jats:title><jats:p>The very limited array of (structurally described) adducts of the form [CpMX<jats:sub>2</jats:sub>]<jats:sub>2</jats:sub> ≡ [CpMX(μ‐X)<jats:sub>2</jats:sub>MXCp] with the unsubstituted/parent Cp (≡ C<jats:sub>5</jats:sub>H<jats:sub>5</jats:sub>, cyclopentadienyl) ligand is augmented by a study of [CpIRu(μ‐I)<jats:sub>2</jats:sub>RuICp], found to be isotypic with the recently described chloride and, with it, providing the only examples of such dimers in their ‘<jats:italic>cis</jats:italic>’ form, <jats:italic>i.e</jats:italic>., the terminal‐X and Cp pairs to the same side of the Ru<jats:sub>2</jats:sub>(μ‐X)<jats:sub>2</jats:sub> 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 (<jats:italic>cf.</jats:italic> the M = Cr, X = Cl counterpart which is <jats:italic>trans</jats:italic>, Cr···Cr 3.3447(8) Å).</jats:p>