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

Abstract

The complexes [M(Hdamsm) 2 ]XÁH 2 O (M = Fe, X = NO 3 ; M = Ru, X = Cl), [Ru(Hdamsm)(PPh 3 ) 2 X 0 ] (X 0 = Cl, Br), and [VO(Hdamsm)(acac)] (H 2 damsm = diacetylmonoxime Schiff base of S-methyldithiocarbazate, Hacac = acetylacetone) have been prepared and characterized by spectroscopic techniques. Their redox properties were investigated by cyclic voltammetry. The X-ray crystal structure of [Fe(Hdamsm) 2 ]NO 3 .H 2 O has been determined and shows that the complex has a distorted octahedral geometry in which the Hdamsm behaves as a monoanionic NNS tridentate ligand coordinating via oxime nitrogen, hydrazinic imine nitrogen, and thiolate sulfur. The reactivity of these complexes toward oxidation of alcohols in the presence of t-BuOOH and H 2 O 2 as co-oxidants is reported.

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 C3─N6 and C8─N7 lengths are both 1.29(1) Å in 1.1 and around this value in 2.2 , and this consistent with Cd─N bond length . The longer bond lengths C3─S2 (1.72(1)Å) for 1.1 and C3─S2 (1.73(1)Å) for 2.2 are close to those found for N, N, S‐donor ligands chelated in their thiolate form . This thiol form is also identified by the fact that the hydrazinic nitrogen atom N6 ( 1.1 ) or N12 ( 2.2 ) is not bonded to any hydrogen atoms.…”

“…The ruthenium(II) complexes show reversible oxidation waves at E 1/2 ~ 0.87 and ~0.93 V (Δ E = 70 mV) for 1.3 and 2.3 , respectively. This is assigned to Ru(II)/Ru(III) redox couple (Figure b, as a representative example).…”

Ruthenium(II)/(III) DMSO-Based Complexes of 2-Aminophenyl Benzimidazole with In Vitro and In Vivo Anticancer Activity

“…To study the electrochemical behavior of complexes ( 1 ) and ( 2 ), cyclic voltammetry was employed. The cyclic voltammogram of ( 1 ) ( Figure 2 a) showed an electrochemically quasi-reversible wave due to the Ru(II)/Ru(III) redox couple [ 51 ] ( E pa = 670 mV, E pc = 560 mV and Δ E = 110 mV, E 1/2 = 615 mV), and compound ( 2 ) ( Figure 2 b) showed an electrochemically reversible redox process [ 39 ], ( E pa = −260 mV, E pc = −330 V, Δ E = 59 mV and E 1/2 = −295 mV). This indicates that complex ( 2 ) can be reduced to Ru(II) by biological reducing agents such as ascorbate ( E ° = −50 mV) [ 52 ] and glutathione ( E ° = −240 mV) [ 53 ].…”

cis-Dioxomolybdenum(VI) complexes of a new ONN chelating thiosemicarbazidato ligand; Synthesis, characterization, crystal, molecular structures and antioxidant activities

“…Crystal and molecular structure analyses of methanol-and n-propanol coordinated complexes, 1 and 3, were carried out, and as a remarkable finding, a quite short intermolecular hydrogen bond between the hydroxyl proton of attached alcohol and an oxo oxygen of MoO 2 unit in another complex molecule was determined in the crystal of complex 1. Although such short bonds have been reported [39], the 1.767 Å value of an intermolecular hydrogen bond length was first observed for the [MoO 2 (L)R-OH)] type of molybdenum-thiosemicarbazone complexes. Interestingly, the O4ÀH14Á Á ÁO1 hydrogen bondis shorter than the coordination bonds in the complex molecule 1 and these interaction formed dimers (Scheme 1) which are stacked in crystal structure as if a single molecule (Fig.…”