Polarographic studies on bipyridine complexes

Design, Syntheses, Complexation, and Electrochemistry of Polynuclear Metallodendrimers Possessing Internal Metal Binding Loci

“…As seen in Figure 3a, the voltammetric response of a 1.0 mm solution of the starting reagent [Ru(bpy) 2 Cl 2 ] is characterized by a chemically irreversible signal for the two bipyridine units (see the negative potential region) and by a reversible wave for the Ru III /Ru II couple. The appearance of three cathodic signals for each bipyridine ligand has been observed for the similar [Ru(bpy) 3 ] 2 complex [46,66,67] and for mixed [Ru(bpy')(bpy) 2 ] 2 complexes. As can be seen in Figures 3b and 3c, the voltammetric signals for both dendrimers show at least three waves in the negative potential region, corresponding to each of the bipyridine ligands in the organometallic complex.…”

Mechanistic investigation of the iron-mediated electrochemical formation of β-hydroxyesters from α-haloesters and carbonyl compounds

“…[ F e ( b p y ) 3 Under these conditions (i.e., in the presence of 3 molar equivalents of 2,2 0 -bipyridine per mole of iron (II)), the intensities of the reduction waves (R 1 , R 2 and R 3 ) and the oxidation waves (O 1 , O 2 and O 3 ) are identical, and the iron species are free of halogen [18][19][20][21]. In the presence of 2 molar equivalents of 2,2 0 -bipyridine, the intensities of the reduction and oxidation waves (except R 2 ) decrease by the same factor ( Fig.…”

“…In dimethylformamide, the cyclic voltammogram of [Fe(bpy) 3 ]X 2 exhibits three successive reversible monoelectronic steps (Scheme 2). It is admitted that the reductive processes on [Fe(bpy) 3 ] 2+ are all ligand-based and the oxidation process is metal-centered [18][19][20][21][22][23].…”

Synthesis, structure and electrochemical properties of the cationic complex tris-(imidazolidine-1,10-phenanthroline)iron(II)

“…2 displays the cyclic voltammogram starting from 0 mV to positive potentials, of a 1 mM solution of [Fe (Imz-phen) 3 ] 2+ in ACN with 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF 6 ) as supporting electrolyte. At negative potentials the [Fe (Imz-phen) 3 ] 2+ complex shows three quasi-reversible electrochemical processes with an E 1/2 value centered at À1000 mV (DE p = 152 mV), À1350 mV (DE p = 112 mV) and À1730 mV (DE p = 144 mV) that would be associated with electron transfers of the aromatic system of the ligand [20,21]. On the other hand, at positive potentials a quasi-reversible process with an E 1/2 value of 1350 mV (DE p = 78 mV) that could be assigned to the Fe(II)/Fe(III) redox couple [4] is seen.…”