Synthesis and structure of aqua-2′,‴-(2,6-pyridindiyldiethylidene) dioxamohydrazide-copper(II) hydrate

Andjelković, Katarina; Ivanović, I.; Niketić, Svetozar R.; Prelesnik, Β.; Leovac, Vukadin M.

doi:10.1016/s0277-5387(97)00265-9

Cited by 34 publications

(33 citation statements)

References 21 publications

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“…Thus, when a suspension of H 4 daps in acetonitrile is electrolysed using [N(CH 3 CH 2 ) 4 ]ClO 4 as the supporting electrolyte, the (2), has been isolated and crystallographically characterised by recrystallisation of 1 from 2-propanol. Complex 1 is stable in air and thermally stable, melting above 300°C without decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…This result demonstrates that the dichloromethane is the chlorine source. In view of this evidence, it was envisaged that electrolytes such as NH 4 Cl or N(CH 3 ) 4 Cl might produce the same result. Therefore, the electrochemical synthesis in the presence of these chloride salts was investigated.…”

Section: Resultsmentioning

confidence: 99%

“…To verify this, the aforementioned electrochemical reaction was performed in the presence of other electrolytes, such as NH 4 PF 6 , N(CH 3 ) 4 Br, or N(CH 2 CH 2 CH 2 CH 3 ) 4 Br. In the case of NH 4 PF 6 , the reaction yielded 1, as one would expect in view of the poor nucleophilicity of PF 6 Ϫ .…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

Fondo

Sousa

Bermejo

et al. 2002

Eur. J. Inorg. Chem.

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The influence of the supporting electrolyte and the solvent of crystallisation on the nature of cadmium complexes of 2,6‐bis(1‐salicyloylhydrazonoethyl)pyridine (H4daps), obtained by an electrochemical procedure, has been investigated. [Cd(H2daps)(H2O)2] (1), [Cd(H2daps)(H2O){(CH3)2CHOH}] (2), [Cd(H3daps)Cl]·CH3CN·0.25H2O (3), [Cd(H3daps)Cl(CH3OH)]·2H2O·CH3OH (4), and [Cd(H2daps)Cl(H2O)]N(CH3)4 (5), have all been isolated and crystallographically characterised. X‐ray diffraction studies show that the cadmium atom in 3 is in an unusual pentagonal pyramidal [CdN3O2Cl] geometry, while in the other compounds the cadmium atom is in a bipyramidal pentagonal environment. The organic ligand acts as a pentadentate dianionic ligand in 1, 2, and 5, and as a pentadentate monoanionic ligand in 3 and 4.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

Fondo

Sousa

Bermejo

et al. 2002

Eur. J. Inorg. Chem.

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“…[1][2][3][4][5][6] This versatility arises from the possibility to act as N,S-donor systems, forming stable four and five-membered metallacycles. In addition, the coordination capacity of thiosemicarbazones can be increased by using aldehydes or ketones that contain additional donor functional groups in suitable positions for chelation or by using appropriate co-ligands (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The reported cases are mainly Cu I and Ag I dinuclear bishelical or tetranuclear cluster compounds formed by spontaneous self assembly processes. [3][4][5][6][7] In contrast, the chemistry of homoleptic Au I complexes with thiosemicarbazones remains totally unexplored.…”

Section: Introductionmentioning

confidence: 99%

A Convenient Mode to Stabilize M^I Metal Ions by Using Thiosemicarbazones

2008

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Cobalt(II), Zinc(II), Iron(III), and Copper(II) Complexes Bearing Positively Charged Quaternary Ammonium Functionalities: Synthesis, Characterization, Electrochemical Behavior, and SOD Activity

et al. 2020

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We have synthesized and characterized Co(II) (1), Zn(II) (2), Fe(III) (3) and Cu(II) (4) complexes of 2,2'‐[2,6‐pyridinediylbis(ethylidyne‐1‐hydrazinyl‐2‐ylidene)]bis[N,N,N‐trimethyl‐2‐oxoethanaminium] dichloride (H2LCl2) by NMR, IR, and X‐Band EPR spectroscopy, respectively, as well as by single‐crystal X‐ray structural analysis. H2LCl2 belongs to the class of diacetylpyridine bis(hydrazone) ligands and bears two positively charged quaternary ammonium functionalities. The complexes 1–3 possess a pentagonal‐bipyramidal geometry, whereas 4 has square‐pyramidal geometry. Redox reactivity and SOD activity of the complexes was studied by means of electrochemical measurements in aqueous‐buffer and DMF or DMSO solutions, respectively, as well as by stopped‐flow measurements. Complexes 1–3 do not have SOD activity, whereas 4 exhibits a high catalytic rate constant for the superoxide dismutation, kcat = 1.73 × 107 m–1 s–1 (in MOPS buffer solution of pH = 7.4). The results were discussed in terms of complex redox potentials, electrostatic interactions and their spatial distribution, kinetic lability of metal centers, and stability of peroxo intermediates, respectively.

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Synthesis and structure of aqua-2′,‴-(2,6-pyridindiyldiethylidene) dioxamohydrazide-copper(II) hydrate

Cited by 34 publications

References 21 publications

Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

A Convenient Mode to Stabilize M^I Metal Ions by Using Thiosemicarbazones

Cobalt(II), Zinc(II), Iron(III), and Copper(II) Complexes Bearing Positively Charged Quaternary Ammonium Functionalities: Synthesis, Characterization, Electrochemical Behavior, and SOD Activity

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Synthesis and structure of aqua-2′,‴-(2,6-pyridindiyldiethylidene) dioxamohydrazide-copper(II) hydrate

Cited by 34 publications

References 21 publications

Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

Electrochemical Synthesis and X-ray Characterisation of Cadmium Complexes Containing 2,6-Bis(1-salicyloylhydrazonoethyl)pyridine − the Influence of the Supporting Electrolyte on the Nature of the Isolated Compounds

A Convenient Mode to Stabilize MI Metal Ions by Using Thiosemicarbazones

Cobalt(II), Zinc(II), Iron(III), and Copper(II) Complexes Bearing Positively Charged Quaternary Ammonium Functionalities: Synthesis, Characterization, Electrochemical Behavior, and SOD Activity

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A Convenient Mode to Stabilize M^I Metal Ions by Using Thiosemicarbazones