title: Steric control on the redox chemistry of (η5-C9H7)2Yb(II)(THF)2 by 6-aryl substituted iminopyridines.
abstract: A steric control on the reductive capacity of ytterbocenes towards iminopyridine ligands is described. The reaction of (η(5)-C(9)H(7))(2)Yb(THF)(2) with a series of 6-organyl-2-(aldimino)pyridyl ligands (IPy) takes place with the replacement of two THF molecules by one IPy unit. In contrast to the rich reductive ytterbocene chemistry described in the presence of the unsubstituted (aldimino)pyridyl ligand, all 6-aryl substituted IPys scrutinized hereafter are involved into the metal coordination as neutral bidentate {N,N} or tridentate {N,N,S; N,N,O} ligands, with no changes of the metal oxidation state in the final complexes. A series of Yb(II) metallocene complexes of general formula (η(5)-C(9)H(7))(2)Yb(II)(η(2) or η(3))[2,6-(i)Pr(2)(C(6)H(3))N=CH(C(5)H(3)N)-6-R)] have been isolated and completely characterized. The stereo-electronic role of the aryl substituents in the IPy ligands on the ytterbocene redox chemistry has also been addressed.
authors.affiliation: G.A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinina 49, GSP-445, 603950, Nizhny Novgorod, Russia. trif@iomc.ras.ru
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Trifonov
authors.forename: Boris G
authors.initials: BG
authors.lastname: Shestakov
authors.forename: Ivan D
authors.initials: ID
authors.lastname: Gudilenkov
authors.forename: Georgy K
authors.initials: GK
authors.lastname: Fukin
authors.forename: Giuliano
authors.initials: G
authors.lastname: Giambastiani
authors.forename: Claudio
authors.initials: C
authors.lastname: Bianchini
authors.forename: Andrea
authors.initials: A
authors.lastname: Rossin
authors.forename: Lapo
authors.initials: L
authors.lastname: Luconi
authors.forename: Jonathan
authors.initials: J
authors.lastname: Filippi
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Sorace