Untitled

Zhou

2005

Transition Met Chem

Six complexes, M(HL) 2 AE nH 2 O (M=Co, Ni and Fe; n=4) with two ligands, 2-carboxy-benzaldehydebenzoylhydrazone (H 2 L 1 ) and 2-carboxybenzaldehyde-(4¢-methoxy)benzoylhydrazone (H 2 L 2 ), have been synthesized and characterized on the basis of elemental analyses, molar conductivities, i.r. spectra and thermal analyses. In addition, the suppression ratio for O ÀÁ 2 (a) and the suppression ratio for OH AE (b) were determined with a 72 spectrophotometer. The 50% inhibition [IC 50 (a) and IC 50 (b)] of the complexes were studied. This study demonstrated that the complexes have activity in the suppression of O ÀÁ 2 (a) and OH AE (b). In general, the antioxidative activities increased as the concentration of these complexes increased up to a selected extent. The complexes exhibit more effective antioxidants than the ligands and the series of the ligand (H 2 L 2 ) are better than the series of the ligand (H 2 L 1 ) do.

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Anti-oxidative Activity of Cobalt(II), Nickel(II) and Iron(II) Schiff Base Complexes

Zhou

2005

Transition Met Chem

“…The mean Cu-N length (1.997(5) Å) is close to that of 1, but is slightly shorter than that in {[Cu(Mebta) 4 (H 2 O)](ClO 4 ) 2 •0.4EtOH} (2.011(4) Å, Mebta = 1-methylbenzotriazole). 44 The average Cu-O bond distance (2.273(4) Å) is longer than that observed in {[Cu (Mebta) 4 (H 2 O)](ClO 4 ) 2 •0.4EtOH} (2.216(4) Å). 44 MMA polymerization studies promoted by 1 and 2…”

Section: Crystal Structure Of 2•2dmfmentioning

confidence: 78%

“…44 The average Cu-O bond distance (2.273(4) Å) is longer than that observed in {[Cu (Mebta) 4 (H 2 O)](ClO 4 ) 2 •0.4EtOH} (2.216(4) Å). 44 MMA polymerization studies promoted by 1 and 2…”

Section: Crystal Structure Of 2•2dmfmentioning

confidence: 78%

Preparation of a nitrate-coordinated copper(ii) complex of 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine as an efficient catalyst for methyl methacrylate polymerization

Miao

et al. 2012

Dalton Trans.

Treatment of [CuCl(2)(bppyH(2))] (1, bppyH(2) = 2,6-di(1H-pyrazol-3-yl)pyridine) with 2 equiv. of AgNO(3) in DMF gave rise to a binuclear Cu(II) complex [Cu(2)(bppyH)(2)(NO(3))(2)] (bppyH = 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine) (2). Complex 2 was characterized by elemental analysis, IR and single crystal X-ray diffraction. Complex 2 has a dimeric structure in which the two Cu(ii) centers are bridged by a couple of the in situ-generated bppyH(-) anions. Each Cu(II) center is further coordinated by one O atom of a NO(3)(-) anion and three N atoms of one bppyH(-) anion. Complex 2 exhibited a higher catalytic activity in the polymerization of methyl methacrylate (MMA) than the precursor complex 1. Even though the ratio of catalyst to MMA was raised up to 1 : 1500, the PDI for 2 (reaction time was fixed at 4 h) is 1.63 and the conversion is up to 72%. The effects of solvent, reaction temperature and the ratio of MMA to catalyst were also investigated.

Bioinorganic Chemistry and Applications

“…To improve the health conditions of patients affected by diseases linked to the increased oxidative stress, many research groups have tried to prepare complex compounds of low molecular weight that would mimic the activity of SODs; unfortunately, SODs themselves cannot be administered, as they would not pass the cell membrane and are quickly metabolized by kidneys [ 11 , 12 ]. In addition to the SOD-like activity of many copper compounds, many copper complexes are also known for their cytotoxic properties, most notably a group of ternary complexes called Casiopeínas.…”

Section: Introductionmentioning

confidence: 99%

Anion-Dependent Synthesis of Cu(II) Complexes with 2-(1H-Tetrazol-5-yl)-1H-indole: Synthesis, X-Ray Structures, and Radical Scavenging Activity

Halaš

Kuchár

Herchel

2021

Two mononuclear Cu(II) complexes, [Cu(phen)2(HL)]ClO4·H2O·2DMF (1) and [Cu(phen)2(HL)2]·EtOH (2), comprising 1,10-phentantroline (phen) and 2-(1H-tetrazol-5-yl)-1H-indole ligand (H2L) ligands are reported. Analysis and characterization of the samples were performed using standard physicochemical techniques, elemental analysis, nuclear magnetic resonance, Fourier transform infrared spectroscopy, and UV-vis spectroscopy. Single-crystal X-ray crystallography revealed the formation of a pentacoordinate complex in 1 and a hexacoordinate complex in 2, in which the anionic ligand HL− has undergone monodentate coordination through the tetrazole unit. Furthermore, the crystal structure of H2L·MeOH is also discussed. The potential application of compounds 1 and 2 in bioinorganic chemistry was addressed by investigating their radical scavenging activity with the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) and the results were supported also by theoretical calculations.