A potentiometric study of guanidinoacetic acid complexation with the ions Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II)

Felcman, Judith; Miranda, J. L.

doi:10.1590/s0103-50531997000600003

Cited by 25 publications

(22 citation statements)

References 9 publications

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“…It was in good agreement with reported value [9][10][11][12][13][14]. Figure 2 shows schematic structures of the species with interactions according to equilibrium (4) & (7) for Cu(Phen)(Trp).…”

Section: +supporting

confidence: 90%

“…The model of species for these ternary systems that was used in superquad program includes all the species of Table 1 as well as the hydrolysis of Cu 2+ [11,12]. The stability constants of the binary complexes were refined separately using the titration data of this system in a 1:1 and 1:2 ligand: Cu 2+ ratio in the same conditions of temperature and ionic strength.…”

Section: Potentiometric Analysesmentioning

confidence: 99%

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Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution

Sajadi

2014

OJINM

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Section: +supporting

confidence: 90%

Section: Potentiometric Analysesmentioning

confidence: 99%

Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution

Sajadi

2014

OJINM

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“…The model of species for these ternary systems that was used in superquad program includes all the species of table 1 as well as the hydrolysis of Cu 2+ [11,12]. The stability constants of the binary complexes were refined separately using the titration data of this system in a 1:1 and 1:2 ligand: Cu 2+ ratio in the same conditions of temperature and ionic strength.…”

Section: Potentiometric Analysesmentioning

confidence: 99%

Glycine and L-Tryptophan, a Comparative Investigation on Interactions in Cu(II) Binary and Ternary Complexes in Aqueous Solution

Sajadi

2012

AJB

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Abstract, is displacement due to the well known experience that mixed ligand complexes formed by a divalent 3d ion, a heteroaromatic N base and an O donor ligand possess increased stability. The other part of this displacement, which amount on average to an increased stability of the mixed ligand Cu(Bpy)(Trp) and Cu(Phen)(Trp) complexes of about 0.97 or 1.31 log unit. The stability constants of the 1:1 complexes formed between Cu 2+ , Cu(Bpy) 2+ or Cu(Phen) 2+ and Trp 2− , were determined by potentiometric pH titration in aqueous solution (I = 0.1 M, NaNO 3 , 25℃). The order of the stability constants was reported. The results show following order for Trp, Cu(Trp) < Cu(Bpy)(Trp) < Cu(Phen)(Trp), and Gly, Cu(Gly) > Cu(Bpy)(Gly) ≤ Cu(Phen)(Gly). A comparative investigation between ternary complexes of Trp and Gly v is made. The comparison of stability constants of these ternary complexes show that Cu(Har) (Gly) exist in open form but Cu(Har)(Trp) is found near 100% in closed form. The differences between the above mentioned stability constants based on stacked form of Cu(Har)(Trp). The stacked form provides for increased stability.

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“…The model of species for this ternary system that was used in superquad program includes all the species of table 1 as well as the hydrolysis of Cu 2+ [11,12]. The stability constants of the binary complexes were refined separately using the titration data of this system in a 1:1 and 1:2 ligand:Cu 2+ ratio in the same conditions of temperature and ionic strength.…”

Section: Potentiometric Analysesmentioning

confidence: 99%

L-Tryptophan, a Study on Interactions in Cu(II) Binary and Ternary Complexes in Aqueous Solution

Sajadi¹

2012

CHEMISTRY

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A potentiometric study of guanidinoacetic acid complexation with the ions Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II)

Cited by 25 publications

References 9 publications

Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution

Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution

Glycine and L-Tryptophan, a Comparative Investigation on Interactions in Cu(II) Binary and Ternary Complexes in Aqueous Solution

L-Tryptophan, a Study on Interactions in Cu(II) Binary and Ternary Complexes in Aqueous Solution

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