Steric control on the redox chemistry of (η5-C9H7)2YbII(THF)2 by 6-aryl substituted iminopyridines

By Trifonov, Alexander A.; Shestakov, Boris G.; Gudilenkov, Ivan D.; Fukin, Georgy K.; Giambastiani, Giuliano; Bianchini, Claudio; Rossin, Andrea; Luconi, Lapo; Filippi, Jonathan & Sorace, Lorenzo
Published in Dalton Trans. The Royal Society of Chemistry 2011

Abstract

A steric control on the reductive capacity of ytterbocenes towards iminopyridine ligands is described. The reaction of ([small eta]5-C9H7)2Yb(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 YbII metallocene complexes of general formula ([small eta]5-C9H7)2YbII([small eta]2 or [small eta]3)[2, 6-iPr2(C6H3)N[double bond, length as m-dash]CH(C5H3N)-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.

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