6.14 – Mononuclear Ru/Os Compounds with Cyclic C5–C6 Ligands (Except Compounds containing monohapto Ligands)

摘要: This chapter deals with the chemistry of η5- and η6-sandwich half-sandwich ruthenium osmium complexes (except metallocenes those derivatives bearing η1-M–C bonds which are covered in Chapters 6.16 6.15, respectively). They belong to four types: (i) Bis(η6-arene) sandwich complexes, (ii) mixed (η5-cyclopentadienyl)–(η6-arene) (iii) η5-cyclopentadienyl (iv) η6-arene complexes. The first part includes bis(η6-arene) monocyclic polycyclic arenes, as well cyclophanes, have been prepared almost exclusively using [M(acetone)3(η6-arene)][Y]2 (M = Ru, Os; Y = counteranion) [Ru(OTf)2(η6-arene)] precursors. In contrast, starting material used synthesis cyclopentadienyl–arene is strongly dependent on nature cyclopentadienyl ligand (Cp, Cp*, or functionalized Cp). ability [Ru (η5-Cp)]+ [Ru(η5-Cp*)]+ fragments activate arene moiety has nicely applied highly organic molecules, representing nowadays a viable alternative classical isoelectronic Cr(CO)3 fragment. continued attract considerable interest. Along Cp, indenyl derivatives, novel tethered-type cyclopentadienyls planar chirality recently appeared. All them able coordinate great variety monodentate polydentate ligands including N-, O-, P-, As-, Sb-, S-, Se-, Te-, B-, Al-, Ga-, Si-, Ge-, Sn-donor ligands, hydride, dihydrogen, carbonyl, isocyanide, olefin, alkyne, allyl ligands. Similar developments performed arene–ruthenium arene–osmium type complex continues be readily accessible from dinuclear species [{MCl(μ-Cl)(η6-arene)}2] Os). Recent include, among others, chiral water-soluble species.