Tertiary phosphine complexes of the cobalt(III) <i>NN</i>′-ethylenebis(salicylideneiminato) and bisdimethylglyoximato systems

Smith, Cheryl; Loon, G. W. Van; Baird, Michael C.

doi:10.1139/v76-267

Cited by 19 publications

(22 citation statements)

References 21 publications

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“…In the six-coordinate adduct, when a water or solvent molecule occupies the sixth position, the interaction is very weak [8], resulting in the larger solvated form of the Salen complex, and a lower formation constant compared to Me 2 Salen, despite the higher steric factor of Me 2 Salen vs. that of Salen. This trend is seen for Me 2 Salen and Salen of cobalt(III) complexes with P(Bu 3 ) and PMe 2 Ph as axial ligands, as well [9,10].…”

Section: Effect Of Equatorial Ligandsmentioning

confidence: 65%

“…The phosphine axial ligand trans effect on the thermodynamics of the five-coordinated Co(III) Schiff base complexes has been studied well [8][9][10][11][12]. The steric and electronic effects of Schiff bases and the axial ligands on equilibrium constants were investigated in our laboratory, previously [10][11][12].…”

Section: Acceptor Property Of Cobalt(iii) Schiff Base Complexesmentioning

confidence: 99%

“…The formation *Corresponding author. E-mail: asadi@chem.susc.ac.ir constants for some [Co(Salen)(PR 3 ) 2 ] + were examined in acetonitrile and in 95% ethanol [9]. Previously, we determined the relationships between the steric and the electronic effects of Salen Schiff bases on the stability of pentacoordinate complexes like [Co(Salen)X]ClO 4 .H 2 O [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Donor ligand, basal ligand and solvent effects on the equilibrium constants of triphenylphosphinecobalt(III) Schiff base complexes with phosphite ligands

Asadi

Mohammadi

Kiyanfar

2006

JICS

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The equilibrium constants and the thermodynamic parameters were spectrophotometrically measured for the 1:1 adduct formation of [Co(Salen)(PPh 3 )]ClO 4 .H 2 O, and [Co(7,7 ' -Me 2 Salen)(PPh 3 )]ClO 4 .H 2 O as acceptors, with P(OR) 3 (R = methyl, ethyl , and i-propyl) as donors, in acetonitrile (CH 3 CN) and dimethylformamide (DMF) as solvents at constant ionic strength (I = 0.1 M NaClO 4 ), and various temperatures (t = 10-50 °C). Our results revealed the following trends: stability of the cobalt(III) Schiff base complexes toward a given phosphite donor, [Co(7,7 ' -Me 2 Salen)(PPh 3 )] + < [Co(Salen)(PPh 3 )] + ; binding of the donors (phosphites) toward a given cobalt( ) Schiff base complex, P(OEt) 3 > P(OMe) 3 > P(O-i Pr) 3 ; influence of solvent on the stability of a given cobalt(III) Schiff base complex toward a given phosphite donor, CH 3 CN < DMF.

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Section: Effect Of Equatorial Ligandsmentioning

confidence: 65%

Section: Acceptor Property Of Cobalt(iii) Schiff Base Complexesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Donor ligand, basal ligand and solvent effects on the equilibrium constants of triphenylphosphinecobalt(III) Schiff base complexes with phosphite ligands

Asadi

Mohammadi

Kiyanfar

2006

JICS

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“…Co(Salophen) complex (N,N'-bis(salicylidene)-1,2-phenylenediaminocobalt(II)) was prepared according to methods previously published. 35,36 The standard solutions were prepared previously for each experiment by appropriate dilution of the stock solutions. All solutions were prepared with water purified in a Purelab Classic System from ELGA (Buckinghamshire, USA) and the actual pH of each solution was determined with a pH meter model Digimed DM-20 (São Paulo, Brazil).…”

Section: Reagents and Chemicalsmentioning

confidence: 99%

Amperometric Electrochemical Platform for Hydrazine Determination Exploiting Reduced Graphene Oxide, Co(Salophen) and DNA: Application in Pharmaceutical Formulations Samples

Freitas¹,

Lima²,

Silva³

et al. 2018

J. Braz. Chem. Soc.

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The present work presents the development of a sensitive and selective amperometric sensor for the determination of hydrazine (HZ) in pharmaceutical formulations using a glassy carbon electrode (GCE) modified with a composite based on Co(Salophen), reduced graphene oxide (rGO) and deoxyribonucleic acid (DNA). The rGO/Co(Salophen)/DNA composite was characterized by using Fourier-transform infrared spectroscopy (FTIR), cyclic voltammetry, and amperometry. The proposed platform presented a well-defined voltammetric profile with a redox couple around 0.32 V vs. Ag/AgCl which showed excellent catalytic activity towards HZ oxidation. The peak current of HZ electrochemical oxidation on the proposed electrochemical platform have changed linearly with the HZ concentration in the range from 2 to 364 µmol L -1 . The proposed platform presented sensitivity, limit of detection, and limit of quantification of 0.056 µA L µmol , and 1.64 µmol L -1 to HZ, respectively. The relative standard deviation for eight determinations using a solution of 50 µmol L -1 HZ was 0.85%. The proposed sensor was successfully applied for the determination of HZ in pharmaceutical formulations, and the recovery tests showed a good accuracy with recovery percentage between 99 and 101%.Keywords: sensor, Co(Salophen), reduced graphene oxide, DNA, hydrazine, pharmaceutical formulations IntroductionNowadays, the interest on hydrazine (HZ) has been increasing due to its high reactivity, which has been exploited in the production of a number of materials including insecticides and pesticides, as well as it has been employed in the preparation of some pharmaceutical formulations such as nifuroxazide, carbidopa, hydralazine, dihydralazine, isoniazid and iproniazide. [1][2][3][4] On the other hand, the HZ is an extremely toxic compound as stated by some regulatory agencies such as the United States Environmental Protection Agency and the European Medicines Agency. 5,6 According to regulatory agencies, the recommended levels of HZ in medicinal products such as isoniazid based drugs is of 125 ppm 5,6 since the exposition to high levels of hydrazine can be harmful to human life because of its potential carcinogenic and mutagenic effects. [5][6][7] In this sense, the monitoring of HZ in pharmaceutical formulations is of high importance to ensure the quality of the medicines released for consumption by the population.The high importance of HZ in industrial, environmental and pharmaceutical fields have motivated the development of several analytical methodologies for HZ determination, such as spectrophotometry, 8 injection analysis based systems, 9 chromatographic methods, 10,11 and electrochemical methods. [12][13][14][15] The electrochemical methods present some interesting properties in comparison to the previously Freitas et al. 2097 Vol. 29, No. 10, 2018 presented non-electrochemical methods, since they do not require long preparing steps, analytical grade reagents or skilled operators for the analysis. In this sense, the electrochemical methods show excell...

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“…All the Schiff base ligands were prepared using the known methods [12,[26][27][28]. The M(II) BAE, BBE and BFE complexes were prepared following the literature procedure [26].…”

Section: Experimental Chemicals and Apparatusmentioning

confidence: 99%

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

Kianfara

Zargari

Khavasi

2010

JICS

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The synthesis and characterization of [Ni(BCE)] and [Cu(BCE)] (where BCE = bis(3-chloroacetylacetone)ethylenediimine) are described. The coordination geometry of [Ni(BCE)] was determined by X-ray crystallography. It was found to be planar and four coordinate in the solid state. The electrochemical properties of M(Chel), where M = Co(II), Ni(II) and Cu(II), and Chel = BAE (bis(acetylacetone)ethylenediimine), BBE = bis(benzoylacetone)ethylenediimine, BFE (bis(1,1,1-triflouroacetylacetone) ethylenediimine and BCE ligands were investigated in DMF and DMSO as solvents. The oxidation potentials changed from left to right in the periodic table in the trend: Co < Ni < Cu, while the reduction potentials changed according to the trend: Ni > Co > Cu. The oxidation potentials of M(II) to M(III) (M = Ni and Cu) increased according to the Schiff base ligands in the trend: BAE < BBE < BCE < BFE, while the reduction potentials followed a reverse trend: BAE > BBE > BCE > BFE. The oxidation potentials of M(II) to M(III) increased according to the solvent in the trend: DMSO < DMF.

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Tertiary phosphine complexes of the cobalt(III) NN′-ethylenebis(salicylideneiminato) and bisdimethylglyoximato systems

Cited by 19 publications

References 21 publications

Donor ligand, basal ligand and solvent effects on the equilibrium constants of triphenylphosphinecobalt(III) Schiff base complexes with phosphite ligands

Donor ligand, basal ligand and solvent effects on the equilibrium constants of triphenylphosphinecobalt(III) Schiff base complexes with phosphite ligands

Amperometric Electrochemical Platform for Hydrazine Determination Exploiting Reduced Graphene Oxide, Co(Salophen) and DNA: Application in Pharmaceutical Formulations Samples

Synthesis and electrochemistry of M(II) N2O2 schiff base complexes: X-Ray structure of {Ni[Bis(3-chloroacetylacetone)ethylenediimine]}

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