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

Abstract

The very limited array of (structurally described) adducts of the form [CpMX 2 ] 2 ϵ [CpMX(μ-X) 2 MXCp] with the unsubstituted/parent Cp (ϵ C 5 H 5 , cyclopentadienyl) ligand is augmented by a study of [CpIRu(μ-I) 2 RuICp], 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 Ru 2 (μ-X) 2 arrays, which are appre-1093 ciably folded at the X···X lines, with the short Ru···Ru distances (2.7748(6) (X ϭ Cl), 2.9034(8) Å (X ϭ I)), consistent with the presence of appreciable metal-metal bonding (cf. the M ϭ Cr, X ϭ Cl counterpart which is trans, Cr···Cr 3.3447(8) Å ).

Synthesis of Ruthenium Half‐Sandwich Complexes by Naphthalene Replacement in [CpRu(C10H8)]+

“…The structure of iodide 8c was established by X‐ray diffraction (Figure 3). The Ru ··· Cp distance in 8c (1.857 Å) is close to those in the half‐sandwich complexes [CpRu(PPh 3 ) 2 I] (1.855 Å)33 and [CpRuI 2 ] 2 (1.851 Å)34 but is notably longer than those in sandwich compounds Cp 2 Ru (1.822 Å)35 and 1 (1.811 Å) 17,18. The Ru–C cod distances and geometry of the cyclooctadiene ligand in 8c are generally similar to those in complex [Cp*Ru(cod)Cl] 36.…”