Studies on the mixed-ligand complexes of copper(II) with gallic acid and pyridine carboxylic acids and their benzologues

Abu-Bakr, M. S.; Rageh, H.M.; Hashem, Elham Y.; Moustafa, Mahmoud Hassan

doi:10.1007/bf00813805

Cited by 9 publications

(9 citation statements)

References 11 publications

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“…5 (A,B)) were interpreted using relations derived by Sommer et al [18,19]. The absorbance vs. pH graphs were analyzed graphically as described previously [20]. As shown in Fig.…”

Section: Potentiometric Titrationsmentioning

confidence: 99%

Physicochemical Studies of Nickel and Copper Complexes With Tar and Simultaneous Determination of the Metal Ions in Mixtures by Derivative Spectrophotometry

Moustafa

Hesseen

Hassan

et al. 2011

Al-Azhar Bulletin of Science

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Nickel(II) and Copper(II) chelates of 4-(-thiazolylazo)resorcinol (TAR) were reported. 2T he dissociation constants of the ligand and the stability constants of the metal complexes were calculated pH-metrically and spectrophotometrically at 25 • C, in 50% (v/v) ethanol and 0.1 M ionic strength. The effects of an acid or a base on the visible absorption behaviour of the ligand and complexes has been investigated. Nickel and copper react with 4-(-2t hiazolylazo)resorcinol (TAR) to form a binary complexes. The equilibria occurring in solution were established and the basic characteristics of the complexes formed were determined. The complexation reaction in the systems investigated were demonstrated and characterized using graphical logarithmic analysis of the absorbance versus pH graph. The composition of the formed complexes with the reagent have been determined. The molar absorptivity of the binary system is investigated. The binary systems obeyed beer's law up to 0.23 and 0.25 µg/ml for Ni 2+ and Cu 2+ respectively. A simple and highly sensitive procedure for spectrophotometric determination of Ni 2+ and Cu 2+ has been developed. A method for the simultaneous determination of nickel and copper in mixtures by first-derivative spectrophotometry is described. Zero-crossing measurement technique is found suitable for the simultaneous determination of the metal ions. The method has been applied to direct determination of copper and nickel in dome synthetic mixtures without any separation.

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“…5 (A,B)) were interpreted using relations derived by Sommer et al [18,19]. The absorbance vs. pH graphs were analyzed graphically as described previously [20]. As shown in Fig.…”

Section: Potentiometric Titrationsmentioning

confidence: 99%

Physicochemical Studies of Nickel and Copper Complexes With Tar and Simultaneous Determination of the Metal Ions in Mixtures by Derivative Spectrophotometry

Moustafa

Hesseen

Hassan

et al. 2011

Al-Azhar Bulletin of Science

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“…The acid base properties of GAL in water-ethanol media have been discussed previously [11]. Using the potentiometric and the absorption spectra data obtained for each method, estimation of the acidity constants of L-adrenline and the complex formation constants were determined using the SUPERQUAD program [31].…”

Section: Calculationsmentioning

confidence: 99%

“…The program has been used to calculate acidity constants in systems previously studied [12,32]. The absorbance vs. pH graphs were analyzed graphically as described previously [11]. Timberlake [33] have been shown that adrenaline has four weakly acidic function groups, the first ionisation is relatively strong and is attributed to imino group, the second and third to one and the other to catechol phenolic groups and the fourth to the alcoholic group respectively.…”

Section: Calculationsmentioning

confidence: 99%

“…The values of the acid dissociation constants of gallic acid were determined potentiometrically in our previous work [11]. The proton-ligand formation numbers were caculated by Irving and Rossotti ‫ۥ‬sexpression [27].…”

Section: Acid-base Properties Of the Reagentsmentioning

confidence: 99%

“…Gallic acid have been used as chelating agent in ternary complexes [10]. I have been reported and disscussed the dissoociation constants of gallic acid and its ternary cupper(II) [11], mercury(II) [12] and thorium(IV) [13,14] complexes. The microscopic constants for side-chain ammonium and phenolic hydroxy groups of adrenaline have been determined from spectrophotometric and potentiometric data [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Studies on the Binary and Ternary Complexes of Aluminium(iii) With Gallic Acid and Adrenaline

Moustafa

2010

Al-Azhar Bulletin of Science

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The reaction of aluminium(III) ions with gallic acid (3,4,5-trihydroxybenzoic acid) (GAL) and adrenaline (epinephrine) (1-(3,4-dihydroxyphenyl)-2-methylaminoethanol) (ADR) was investigated by potentiometric and optical means. Stability constants of the binary and ternary complexes at 25°C and in 0.1 M NaNO3 ionic strength in aqueous solution have been determined. The complex formation equilibria involving adrenaline were characterized The constant due to

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The Zinc(II) Coordination Polymer with Mixed-Ligand of 4-Hydroxypyridine-2,6-dicarbolic Acid and Benzene-1,2,4,5-tetracarboxylic Acid in the Presence of Piperazine as a Counter Ion: Synthesis, Crystal Structure and Solution Study

et al. 2015

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Studies on the mixed-ligand complexes of copper(II) with gallic acid and pyridine carboxylic acids and their benzologues

Cited by 9 publications

References 11 publications

Physicochemical Studies of Nickel and Copper Complexes With Tar and Simultaneous Determination of the Metal Ions in Mixtures by Derivative Spectrophotometry

Physicochemical Studies of Nickel and Copper Complexes With Tar and Simultaneous Determination of the Metal Ions in Mixtures by Derivative Spectrophotometry

Studies on the Binary and Ternary Complexes of Aluminium(iii) With Gallic Acid and Adrenaline

The Zinc(II) Coordination Polymer with Mixed-Ligand of 4-Hydroxypyridine-2,6-dicarbolic Acid and Benzene-1,2,4,5-tetracarboxylic Acid in the Presence of Piperazine as a Counter Ion: Synthesis, Crystal Structure and Solution Study

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