Heteroleptic ruthenium(II)/(III) 2,2′-bipyridine/1,10-phenanthroline complexes incorporating bidentate Schiff base N,O-ligands.

Eight substituted bidentate Schiff base ligands HOC6H4CH=N-R (HL) (HL1: R = 4-ClC6H4, HL2: R = 2-ClC6H4, HL3: R = 4-NO2C6H4, HL4: R = 4-MeC6H4, HL5: R = 2,6-Me2C6H3, HL6: R = 2,46-Me3C6H2, HL7: R = CH2C6H5, and HL8: R = n-Pr) were synthesized by the typical condensation reaction. Interaction ofcis-[Ru(bpy)2Cl2]⋅2H2O (bpy = 2,2′-bipyridine) with one equivalent of HLligand in the presence of KPF6afforded the cationic ruthenium(II) complexes of the type [Ru(bpy)2(L)](PF6) (1–8). The reaction ofcis-[Ru(phen)2Cl2]⋅2H2O (phen = 1,10-phenanthroline) and HL1under similar condition gave complex [(phen)2Ru(L)](PF6) (1a). Treatment ofcis-[Ru(phen)2Cl2]⋅2H2O with two equivalents of HLin the presence of KPF6resulted in isolation of the cationic ruthenium(III) complexes of the type [Ru(phen)(L)2](PF6) (9-16). All complexes have been spectroscopically characterized. The structures of1a⋅CH2Cl2,2⋅½CH2Cl2,3⋅CH3CN,5⋅½H2O,6,12⋅½HOCH2CH2OH,13⋅CH3CN,15⋅H2O, and16have been determined by single-crystal X-ray diffraction. [ABSTRACT FROM PUBLISHER]