Studies on Biologically Relevant Binary and Ternary Metal Comlexes II. Cu(II) Ternary Complexes Involving Bipyridyl and a Series of Terdentate Amino Acids

Prasad, K. Rajendra; Rao, A.K.S. Bhujanga; Mohan, M.

doi:10.1080/00958978708081209

Cited by 17 publications

(1 citation statement)

References 12 publications

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“…His containing antibacterial peptides have been reported in few peptides including histatin, clavanin and chrysophsin [7][8][9][10][11][12]. The formation and structure of histidine complexes with some transition metal ions have been studied in aqueous medium [13][14][15][16][17][18][19]. Speciation of the gold(III)-histidine complexes reveals important speciation information for both environmental and medical issues [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of dielectric constant of medium on chemical speciation of L-histidine complexes of Co(II), Ni(II) and Cu(II)

Sala¹,

Bokka²,

Kethavath³

et al. 2012

Bull. Chem. Soc. Eth.

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ABSTRACT. Chemical speciation of binary complexes of Co(II), Ni(II) and Cu(II) ions with L-histidine have been studied pH metrically in the concentration range of 0-60% v/v DMSO-water mixtures maintaining an ionic strength of 0.16 M at 303 K. Alkalimetric titrations were carried out in different relative concentrations of metal and histidine. Stability constants of various models of binary complexes were refined with MINIQUAD75. The best-fit chemical models were selected based on statistical parameters and residual analysis. The species detected are MLH, ML2, ML2H, ML2H2 and ML2H4 for Co(II); ML2, ML2H, ML2H2 and ML2H4 for Ni(II); and MLH, ML2, ML2H and ML2H2 for Cu(II). The chemical speciation, metal bioavailability and transportation are explained based on the distribution diagrams.

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Section: Introductionmentioning

confidence: 99%

Effect of dielectric constant of medium on chemical speciation of L-histidine complexes of Co(II), Ni(II) and Cu(II)

Sala¹,

Bokka²,

Kethavath³

et al. 2012

Bull. Chem. Soc. Eth.

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Potentiometric Investigation of Silver (I) Complexation by Arginine

Antonilli¹,

Bottari²,

Festa³

et al. 2007

Annali di Chimica

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Arginine is an important amino acid involved in the production of NO, which is a vasodilatator. Its property as ligand towards cations was little studied. Also its protonation constants, even if subject of several studies, were not accurately determined. In this paper electromotive force measurements are performed by using a hydrogen electrode to accurately determine the three protonation constant of arginine. At 25°C and in 1.00 mol dm -3 NaClO 4 , as ionic medium, they are log k 1 =12.53 ± 0.05; log k 1 k 2 = 21.36 ± 0.03 log k 3 = 2.20 ±0.07, while in 1.00 mol dm -3 NaCl, the following values were obtained: log k 1 =12.35 ± 0.05; log k 1 k 2 = 21.18 ± 0.03; log k 3 = 2.08 ±0.07. Galvanic cells involving silver and glass electrodes were employed to study the behaviour of L-arginine as ligand towards silver (I). The experimental data, obtained at 25°C and in 1.00 mol dm -3 NaClO 4 , were explained by assuming the formation of the species Ag(HL) (log β 1,1,1 = 3.79 ± 0.04) and Ag(HL) 2 (log β 1,2,2 = 7.36 ± 0.03) The results of this paper will be used for future investigation.

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Equilibrium studies on binary and ternary Cu(II) complexes containing ethylenediaminediacetic acid and a series of O−-O−, N-O− and N-N donor ligands

Yogi

Kumar

Mohan

et al. 1992

Proc. Indian Acad. Sci. (Chem. Sci.)

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The formation constants for ternary metal complexes (MLA) where L= ethylenediaminediacetie acid (EDDA), M = Cu(II) and A = glycine, alanine, leucine, serine, threonine, methionine, proline, phenylalanine, tryptophan, histidine, aspartic acid, ethylenediamine, histamine, 2,2'-bipyridyl, 1,10-phenanthroline, imidazole, oxalic acid, malonic acid, pyrocatechol and nitropyrocatechol have been investigated by pH-metric method at 35~ and/1 = 0.2 M (KNO~). With respect to the donor atoms on ligand A, the stabilities of the ternary complexes increase in the order O--O-< N-O-,~ N-N. The stabilities of the various ternary complexes decrease with the increasing number ofcarboxylate groups on the ligand in the order ethylenediamine (EN) < ethylenediamine monoacetic acid (EDMA) < EDDA. Various factors influencing the formation and stabilities of ternary complexes are discussed.

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Studies on Biologically Relevant Binary and Ternary Metal Comlexes II. Cu(II) Ternary Complexes Involving Bipyridyl and a Series of Terdentate Amino Acids

Cited by 17 publications

References 12 publications

Effect of dielectric constant of medium on chemical speciation of L-histidine complexes of Co(II), Ni(II) and Cu(II)

Effect of dielectric constant of medium on chemical speciation of L-histidine complexes of Co(II), Ni(II) and Cu(II)

Potentiometric Investigation of Silver (I) Complexation by Arginine

Equilibrium studies on binary and ternary Cu(II) complexes containing ethylenediaminediacetic acid and a series of O−-O−, N-O− and N-N donor ligands

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