scholarly journals Studies on Imidazole Derivatives as Chelating Agents. III. Syntheses of Schiff Bases and 4 (5)-Aminomethyl Derivatives and Their Reactions with Metal Ions.

1967 ◽  
Vol 15 (10) ◽  
pp. 1453-1460 ◽  
Author(s):  
Osamu Yamauchi ◽  
Hisashi Tanaka ◽  
Toyozo Uno
Keyword(s):  
Metal Ions ◽  
Schiff Bases ◽  
Chelating Agents ◽  
Imidazole Derivatives ◽  
Aminomethyl Derivatives

Multidentate chelating agents from Quinoline-8-aldehyde. I. Tridentate and quadridentate Schiff bases from primary diamines

1966 ◽  
Vol 19 (12) ◽  
pp. 2241 ◽  
Author(s):  
J Dekkers ◽  
HA Goodwin
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Schiff Bases ◽  
Copper Complexes ◽  
Chelating Agents ◽  
Steric Effects ◽  
Partial Hydrolysis ◽  
Trigonal Bipyramidal ◽  
Hydrolysis Of

Complexes of 1,2-bis(8-quinolylmethyleneimino)ethane with cobalt(II), nickel(II), and copper(II) are described. The copper complexes are five-covalent and, it is suggested, trigonal bipyramidal. Reaction of the Schiff base with iron(II), cobalt(III), and, under certain conditions, nickel(II) leads to its partial hydrolysis, and complexes of the tridentate 1-amino-2-(8-quinolylmethyleneimino)ethane are obtained. The hydrolysis of the Schiff base in the presence of metal ions is discussed in terms of steric effects within the base and of the stereochemical demands of the metal ions. Complexes of 1,2-bis(8-quinolylmethyleneimino)benzene and its hydrolysis derivative 1-amino-2-(8-quinolylmethyleneimino)ethane are also described.

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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