Effect of urea on the speciation of 1,10-phenanthroline complexes of toxic metal ions—computer augmented modelling studies

Padmaja, Nimmagadda; Babu, M.; Rao, G. Nageswara; Rao, R. Sambasiva; Ramana, K. V. V.

doi:10.1016/s0277-5387(00)86784-4

Cited by 29 publications

(23 citation statements)

References 26 publications

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“…Titrations with different ratios (1:2.5, 1:3.5, 1:5.0) of metal-to-ligand were carried out with 0.4 M sodium hydroxide. Other experimental details are given elsewhere [23].…”

Section: Methodsmentioning

confidence: 99%

Speciation of L-aspartic acid complexes of Co(II), Ni(II), Cu(II) and Zn(II) in acetonitrile- and ethylene glycol-water mixtures

Kumar¹,

Srikanth²,

Rao³

2012

Bull. Chem. Soc. Eth.

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ABSTRACT. Chemical speciation of binary complexes of Co(II), Ni(II), Cu(II) and Zn(II) with L-aspartic acid was investigated pH-metrically in acetonitrile-and ethylene glycol-water mixtures. The stability constants were calculated using the computer program MINIQUAD75. The best-fit chemical models were selected based on statistical parameters and residual analysis. The models for the binary species contained ML2H2, ML2H and ML2 for Co(II) and Zn(II), ML, ML2H2 and ML2 for Ni(II) and Cu(II) in acetonitrile-and ethylene glycol-water mixtures. The trend in variation of stability constants with change in the dielectric constant of the medium was explained on the basis of electrostatic and non-electrostatic forces. Distribution of the species with pH at different variations (0.0-60.0% v/v) in acetonitrile-and ethylene glycol-water mixtures was also presented.

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“…Titrations with different ratios (1:2.5, 1:3.5, 1:5.0) of metal-to-ligand were carried out with 0.4 M sodium hydroxide. Other experimental details are given elsewhere [23].…”

Section: Methodsmentioning

confidence: 99%

Speciation of L-aspartic acid complexes of Co(II), Ni(II), Cu(II) and Zn(II) in acetonitrile- and ethylene glycol-water mixtures

Kumar¹,

Srikanth²,

Rao³

2012

Bull. Chem. Soc. Eth.

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“…Titrations with different ratios (1:2.5, 1:3.75 and 1:5.0) of metal-ligand were performed with 0.4 mol L -1 sodium hydroxide. Other experimental details are given elsewhere (Padmaja et al, 1990).…”

Section: Methodsmentioning

confidence: 99%

Formation and confirmation of binary complexes of calcium(II), magnesium(II ) and zinc(II) with L-histidine in dioxan-water media

Kumar

Naik

Raju

et al. 2012

Chemical Speciation & Bioavailability

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A computer assisted pH-metric investigation has been carried out on the speciation of binary complexes of Ca(II), Mg(II) and Zn(II) with L-histidine. The titrations are carried out with sodium hydroxide in varying concentrations (0-60% v/v) of dioxan-water mixtures at an ionic strength of 0.16 mol L -1 and at a temperature of 303 K. Ca(II), Mg(II) and Zn(II) form the binary complexes of ML 2 H 4 , ML 2 H 3 , ML 2 H 2 , ML 2 H and ML 2 in dioxan-water mixtures. The effect of systematic errors in the concentrations of the substances on the stability constants is in the order acid > alkali > ligand > metal> Log F. The effect of solvent, dielectric constant of the medium and the electrostatic interactions between the complex species on the stability of the complexes are discussed.

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“…Titrations with different ratios (1:2.5, 1:3.5, 1:5) of metal-to-ligand were carried out with 0.4 M sodium hydroxide. Other experimental details are given elsewhere [10].…”

Section: Methodsmentioning

confidence: 99%

<b>CHEMICAL SPECIATION OF Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) AND Zn(II) BINARY COMPLEXES OF L-METHIONINE IN 1,2-PROPANEDIOL–WATER MIXTURES</b>

Latha

Rao²,

Rao³

et al. 2007

Bull. Chem. Soc. Eth.

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ABSTRACT. Chemical speciation of Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes of Lmethionine in 0.0-60 % v/v 1,2-propanediol-water mixtures maintaining an ionic strength of 0.16 M at 303 K has been studied pH metrically. The active forms of ligand are LH2 + , LH and L -. The predominant species detected are ML, MLH, ML2, ML2H, ML2H2 and MLOH. Models containing different numbers of species were refined by using the computer program MINIQUAD 75. The best-fit chemical models were arrived at based on statistical parameters. The trend in variation of complex stability constants with change in the dielectric constant of the medium is explained on the basis of electrostatic and non-electrostatic forces.

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Effect of urea on the speciation of 1,10-phenanthroline complexes of toxic metal ions—computer augmented modelling studies

Cited by 29 publications

References 26 publications

Speciation of L-aspartic acid complexes of Co(II), Ni(II), Cu(II) and Zn(II) in acetonitrile- and ethylene glycol-water mixtures

Speciation of L-aspartic acid complexes of Co(II), Ni(II), Cu(II) and Zn(II) in acetonitrile- and ethylene glycol-water mixtures

Formation and confirmation of binary complexes of calcium(II), magnesium(II ) and zinc(II) with L-histidine in dioxan-water media

<b>CHEMICAL SPECIATION OF Pb(II), Cd(II), Hg(II), Co(II), Ni(II), Cu(II) AND Zn(II) BINARY COMPLEXES OF L-METHIONINE IN 1,2-PROPANEDIOL–WATER MIXTURES</b>

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