Cocco, Fabio and Zucca, Antonio and Stoccoro, Sergio and Serratrice, Maria and Guerri, Annalisa and Cinellu, Maria Agostina (2014) Synthesis and characterization of palladium(II) and platinum(II) adducts and cyclometalated complexes of 6,6′-cimethoxy-2,2′-bipyridine: C(sp3)—H and C(sp2)—H bond activations. Organometallics, Vol. 33 (13), p. 3414-3424. ISSN 0276-7333. eISSN 1520-6041. Article.
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Reactions of 6,6′-dimethoxy-2,2′-bipyridine (bipy2OMe) with palladium(II) and platinum(II) chlorides or acetates afforded either neutral, [M(bipy2OMe)Cl2], and cationic, [Pt(bipy2OMe)2][Pt(DMSO)Cl3]2, adducts or cyclometalated derivatives [M(bipyOMe,OCH2)X] and [M(bipy2OMe-H)X]2 (M = Pd, X = OAc, Cl; M = Pt, X = Cl) arising from respectively C(sp3)—H and C(sp2)—H bond activation, depending on the metal precursor, solvent, and other reaction conditions. Cyclometalated complexes of the new ligand 6-hydroxy-6′-methoxy-2,2′-bipyridine (bipyOMe,OH), arising from monodemethylation of bipy2OMe, were also formed as coproducts under certain reaction conditions. The crystal structures of [Pt(bipy2OMe)2][Pt(DMSO)Cl3]2 and of [Pd(bipy2OMe-H)(OAc)]2 have been solved by X-ray crystallography.
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