Potentiometric Titrations Involving Chelating Agents, Metal Ions, and Metal Chelates

1955 ◽  
Vol 27 (11) ◽  
pp. 1745-1749 ◽  
Author(s):  
Sidney Siggia ◽  
D. W. Eichlin ◽  
R. C. Rheinhart
Keyword(s):  
Metal Ions ◽  
Chelating Agents ◽  
Metal Chelates ◽  
Potentiometric Titrations

Metal complexes of sulfur–nitrogen chelating agents. V. 2-N-Ethylaminocyclopentene-1-dithiocarboxylic acid complexes of Ni(II), Pd(II), Pt(II), Co(II), Co(III), and Cu(I)

1976 ◽  
Vol 54 (17) ◽  
pp. 2827-2831 ◽  
Author(s):  
K. Nag ◽  
D. S. Joardar
Keyword(s):  
Thermal Analysis ◽  
Metal Ions ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Nmr Spectra ◽  
Chelating Agents ◽  
Metal Chelates ◽  
Ambidentate Ligand

2-N-Ethylaminocyclopentene-1-dithiocarboxylic acid (EACDA) acts as an ambidentate ligand toward several metal ions. Bis-chelates have been obtained with Ni(II), Pd(II), Pt(II), and Co(II), and tris-chelate with Co(III). Cu(I) forms a 1:1 complex. The bonding sites involved in the metal chelates and their stereochemistry have been ascertained from electronic, infrared and nmr spectra, magnetic moment, and thermal analysis. In the Co(II) and Co(III) chelates bonding takes place from (S,S−) donor sites, whereas in the Ni(II), Pd(II), and Pt(II) chelates (N,S−) type bonding occurs. The Cu(I) complex appears to be polymeric in nature.

Formation of bidentate metal chelates from some related pyridine compounds

1967 ◽  
Vol 20 (10) ◽  
pp. 2101 ◽  
Author(s):  
DSC Black
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Chelating Agents ◽  
Metal Chelates ◽  
Qualitative Consideration

2,2?-Dipyridylamine (dpa), 2-pyridyl-2-thiazolylamine (pta), 2,2?- dipyridyl sulphide (dps), 2,2?-dipyridyl sulphone (dpso), and 2,2?- dipyridylmethane (dpm) have been shown to function as bidentate chelating agents with various metal ions. A qualitative consideration of their metal complexes establishes the following stability sequence: dpa ≈ pta > dps > dpm > dpso.

Study on desorption of Mn, Fe, and Mg from TMP and evaluation of the complexing strength of different chelating agents using side reaction coefficients 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Holzforschung ◽  
2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Kim Granholm ◽  
Pingping Su ◽  
Leo Harju ◽  
Ari Ivaska
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Chelating Agents ◽  
Side Reaction ◽  
Sodium Dithionite ◽  
Thermomechanical Pulp ◽  
Peroxide Bleaching ◽  
Ph Values ◽  
Reducing Environment ◽  
Ph Range

Abstract Chelation of thermomechanical pulp (TMP) was studied in this work. The desorption of Mn, Fe, and Mg due to their impact on peroxide bleaching was investigated. The desorption experiments were performed with EDTA, citric acid, oxalic acid, and formic acid as chelating agents at different pH. Chelation experiments with EDTA were carried out at pH 3–11. Sodium dithionite was used as the reducing agent in studying chelation with EDTA in a reducing environment. Mn was very effectively desorbed with EDTA from TMP at pH <10 and the reducing environment further improved the removal of all the studied metal ions from TMP with EDTA. Citric acid also removed Mn effectively from TMP at pH 5. The thermodynamic stability constants of different metal chelates do not present the correct picture of how strongly the metal ions are bound by the chelating agents in different conditions. But by means of the side reaction coefficients (α M(L)-coefficients) it is also theoretically possible to evaluate and compare the real binding strengths between the metal ions and different chelating agents at varying pH values and other solution conditions. In this study, a theory is given for the calculation of side reaction coefficients. Values of the α M(L)-coefficients, for the pH range 0–14, are presented for EDTA, DTPA, and also for some other new potential environmentally friendly chelating agents.

Competition between Cd(II) and other divalent transition metal ions during complex formation with amino acids, peptides, and chelating agents

2016 ◽  
Vol 327-328 ◽  
pp. 55-69 ◽  
Author(s):  
Maurizio Remelli ◽  
Valeria M. Nurchi ◽  
Joanna I. Lachowicz ◽  
Serenella Medici ◽  
M. Antonietta Zoroddu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Transition Metal ◽  
Metal Ions ◽  
Chelating Agents ◽  
Transition Metal Ions

o-hydroxyaroyl-isonicotinoyl hydrazones as chelating agents with divalent transition metal ions

1994 ◽  
Vol 19 (3) ◽  
Author(s):  
RamadanM. El-Bahnasawy ◽  
SomiaE. El-Meleigy ◽  
Abd-Alla El-Tawansi
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Chelating Agents ◽  
Transition Metal Ions
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