Synthesis, structure and solution chemistry of quaternary oxovanadium(V) complexes incorporating hydrazone ligands

Oxovanadium(IV) and ruthenium(II) carbonyl complexes of ONS‐donor ligands derived from dehydroacetic acid and dithiocarbazate: Synthesis, characterization, antioxidant activity, DNA binding and in vitro cytotoxicity

“…The electrochemical behaviour of the complexes was investigated using cyclic voltammetry in degassed dichloromethane containing ( n ‐Bu 4 N)PF 6 (0.1 M) as supporting electrolyte. Voltammetric data (Table ) are compared to ferrocene/ferrocenium couple under the same experimental conditions ( E 1/2 = 0.42 V and Δ E = 70 mV) . The oxovanadium complexes ( 1.1 , 1.2 , 2.1 , 2.2 ) show quasi‐reversible oxidation waves at E 1/2 = 0.73–1.02 V, Δ E = 100–130 mV arising from V(IV)/V(V) oxidation (Figure a, as a representative example).…”

A journey into the electrochemistry of vanadium compounds

“…Complexes with the same N-benzoylhydrazones and different heteroligands [164] displayed one quasi-reversible reduction peak attributed to the VO 3+ /VO 2+ couple (Table 5, entries 55,56). Apparently, changing the heteroligand from vanillin to pyridine and methoxy does not affect reduction potentials, but the authors offered no discussion about it.…”

“…The corresponding complexes with an extra pyridine ligand [164] resulted electro-active and displayed one quasi-reversible reduction peak, although data are reported for only two of them (Table 5, entries 75,76).…”

Complexes of a diacetylmonoxime Schiff base of S-methyldithiocarbazate (H2damsm) with Fe(III), Ru(III)/Ru(II), and V(IV); catalytic activity and X-ray crystal structure of [Fe(Hdamsm)2]NO3·H2O

“…4 [for complex (3), as a representative example]. The E 1/2 for the ferrocene/ferrocinium couple under the experimental conditions was 0.40 V (DE = 65 mV) [40]. A quasi-reversible reduction wave for both iron(III) and ruthenium(III) complexes (1) and (2) was observed at E 1/2 -0.90 V (DE = 80 mV) and -0.34 V On the basis of the analytical and spectroscopic data, the structure of the vanadium(IV) complex (5) is tentatively formulated as shown in Scheme 3.…”