Journal of Organometallic Chemistry p. 76 - 86 (2016)
Update date:2022-08-16
Topics:
Maidich, Luca
Cinellu, Maria Agostina
Cocco, Fabio
Stoccoro, Sergio
Sedda, Mondina
Galli, Simona
Zucca, Antonio
Reaction of 6-methoxy-2,2′-bipyridine (bpy6OMe) with the electron-rich platinum(II) complex [Pt(Me)2(DMSO)2] gave the rollover cyclometalated complex [Pt(κ2-N,C-bpy6OMe-H) (Me) (DMSO)] under mild conditions. The occurrence of rollover cyclometalation was demonstrated by single crystal X-ray diffraction structure determination. In contrast, reaction of bpy6OMewith [Pt(Ph)2(DMSO)2] and [Pt(Cl)2(DMSO)2] under mild conditions gave only adduct species of the type [Pt(X)2(bpy6OMe)] (X = Ph, Cl). Under harsher conditions, activation of a C-H bond in the methoxy substituent yielded the terdentate cyclometalated complex [Pt (κ3-N,N,C-bpy6OMe-H)Cl]. Finally, reaction of Pd(II) and Au(III) derivatives invariably gave adduct species, with the exception of the dimeric complex [Pd(κ2-N,C-bpy6OMe-H) (OAc)]2, which, however, was not isolated in pure form. The reactivity of bpy6OMe, as emerged from this study, was compared with that of the corresponding disubstituted ligand 6,6′-dimethoxy-2,2′-bipyridine, previously studied by us.
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