Influence of Dielectric Constant on Protonation Equilibria of l-Proline and l-Valine in Acetonitrile–Water Mixtures

Swami, B. Veera; Bhushanavathi, Peketi; Rao, G. Nageswara; Prasad, U. Viplava

doi:10.1007/s40010-012-0030-z

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…It exploits the advantages of constrained least-squares method and reliable convergence of Marquardt algorithm. During the refinement of binary systems, the correction factor and the protonation constants of L-proline (Table 1) were fixed (Veeraswami et al, 2012). The variation of stability constants with the dielectric constants of AN-water mixtures were analysed on electrostatic, nonelectrostatic, solute-solute and solute-solvent interactions.…”

Section: Modelling Strategymentioning

confidence: 99%

Chemical speciation of L-proline complexes of Ca(II), Zn(II) and Mn(II) in acetonitrile-water mixtures

Veeraswami

Bhushanavathi²,

Viplavaprasad

et al. 2013

Chemical Speciation & Bioavailability

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Chemical speciation of binary complexes of Ca(II), Zn(II) and Mn(II) with L-proline is investigated pH-metrically in acetonitrile-water mixtures. The stability constants are calculated using the computer program MINIQUAD75. The best-fit chemical models are selected based on statistical parameters and residual analysis. The models for the binary species contained ML + , MLH 2+ and ML 2 H + for Ca(II), Zn(II) and Mn(II). The trend in variation of stability constants with change in the dielectric constant of the medium is explained on the basis of structure forming nature of acetonitrile. Distribution of the species with pH at different variations (0.0-60.0% v/v) in acetonitrile-water mixtures is also presented.

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Section: Modelling Strategymentioning

confidence: 99%

Chemical speciation of L-proline complexes of Ca(II), Zn(II) and Mn(II) in acetonitrile-water mixtures

Veeraswami

Bhushanavathi²,

Viplavaprasad

et al. 2013

Chemical Speciation & Bioavailability

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“…Protonation constants of L-proline and L-valine in ANwater mixtures were reported (Veeraswami et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Speciation of ternary complexes of Ca(II), Zn(II) and Mn(II) with L-proline and L-valine in acetonitrile–water mixtures

Veeraswami¹,

Bhushanavathi²,

Viplavaprasad³

et al. 2014

Chemical Speciation & Bioavailability

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Chemical speciation of ternary complexes of Ca(II), Zn(II) and Mn(II) with L-proline and L-valine was studied in various concentrations (0-60% v/v) of acetonitrile-water mixtures maintaining an ionic strength of 0.16 mol L -1 at 303.0 K. Alkalimetric titrations were carried out with different relative concentrations (M: L: X = 1:2.5:2.5, 1:2.5:5.0, 1:5.0:2.5) of metal (M) to L-proline (L) to L-valine (X). Stability constants of ternary complexes were calculated and various models were refined with MINIQUAD75. The best-fit chemical models were selected based on statistical parameters and residual analysis. The trend of the variation in the stability constants with changing dielectric constant (D) of the medium was explained based on the electrostatic interactions of the ligands, charge neutralisation, chelate effect, stacking interactions and hydrogen bonding. Distribution diagrams with pH at different compositions of aqua-organic mixtures and structures of plausible ternary complexes were also presented.

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Mixed-Ligand Stability Constants of Co(II), Ni(II) and Cu(II) Complexes with l-Proline and l-Valine in Acetonitrile–Water Mixtures

Bhushanavathi

Veeraswami

Rao

2013

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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Influence of Dielectric Constant on Protonation Equilibria of l-Proline and l-Valine in Acetonitrile–Water Mixtures

Cited by 5 publications

References 23 publications

Chemical speciation of L-proline complexes of Ca(II), Zn(II) and Mn(II) in acetonitrile-water mixtures

Chemical speciation of L-proline complexes of Ca(II), Zn(II) and Mn(II) in acetonitrile-water mixtures

Speciation of ternary complexes of Ca(II), Zn(II) and Mn(II) with L-proline and L-valine in acetonitrile–water mixtures

Mixed-Ligand Stability Constants of Co(II), Ni(II) and Cu(II) Complexes with l-Proline and l-Valine in Acetonitrile–Water Mixtures

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