Studies of reagents for spectrophotometric measurement of ionic magnesium

1977 ◽  
Vol 55 (22) ◽  
pp. 3909-3914 ◽  
Author(s):  
Dennis G. McMinn ◽  
Byron Kratochvil
Keyword(s):  
Complex Formation ◽  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Disulfonic Acid ◽  
Acid Dissociation Constants ◽  
Spectrophotometric Measurement ◽  
Ph Range ◽  
Metal Ligand ◽  
The Ideal

Four mono-azo aryl dyes having the o-carboxy-o′-hydroxy functionality were investigated as reagents for the measurement of ionic Mg2+ in solutions containing complexing ligands. 2-(2′-Carboxyl-1′-benzeneazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid came closest to the ideal of having absorbance unaffected by pH over the pH range of interest and of differentiating between Ca2+ and Mg2+ complex formation. Ligand acid dissociation constants and formation constants for the metal–ligand complexes were measured.

ACID DISSOCIATION CONSTANTS AND COMPLEX FORMATION CONSTANTS OF SEVERAL PYRIMIDINE DERIVATIVES1

1961 ◽  
Vol 65 (9) ◽  
pp. 1570-1574 ◽  
Author(s):  
Edmond R. Tucci ◽  
Br. Edward Doody ◽  
Norman C. Li
Keyword(s):  
Complex Formation ◽  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Acid Dissociation Constants ◽  
Complex Formation Constants

scholarly journals Acid dissociation constants and copper chelate formation constants of thiazolylthiourea derivatives

1961 ◽  
Vol 10 (10) ◽  
pp. 1122-1124 ◽  
Author(s):  
Toyozo UNO ◽  
Sumiyuki AKIHAMA ◽  
Kuniko TERADA
Keyword(s):  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Copper Chelate ◽  
Acid Dissociation Constants ◽  
Chelate Formation

scholarly journals Acid Dissociation Constants of Alkyl Xanthic Acids and Formation Constants of Cadmium(II) and Zinc(II) Xanthato Complexes in 1:1 v/v H2O-DMF Medium

1984 ◽  
Vol 57 (11) ◽  
pp. 3074-3076 ◽  
Author(s):  
Kenjiro Hayashi ◽  
Yoshiaki Sasaki ◽  
Shigehiro Inomata ◽  
Takagimi Yanagidani
Keyword(s):  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Acid Dissociation Constants

scholarly journals Methylmercury(II) sulfhydryl interactions. Potentiometric determination of the formation constants for complexation of methylmercury(II) by sulfhydryl containing amino acids and related molecules, including glutathione

1983 ◽  
Vol 61 (7) ◽  
pp. 1428-1434 ◽  
Author(s):  
Alan P. Arnold ◽  
Allan J. Canty
Keyword(s):  
Amino Acids ◽  
Dissociation Constants ◽  
Formation Constants ◽  
Low Ph ◽  
Acid Dissociation ◽  
Mercaptoacetic Acid ◽  
Cationic Complex ◽  
Acid Dissociation Constants ◽  
Mercaptosuccinic Acid

Formation constants for the interaction of methylmercury(II) with 2-mercaptoethanol, mercaptoacetic acid, O-methyl-mercaptoacetate, 2-mercaptosuccinic acid, L-cysteine, D,L-penicillamine, N-acetyl-D,L-penicillamine, glutathione, thiocholine, and 4-mercapto-N-methylpiperidine have been determined by potentiometric titration. For the equilibrium [Formula: see text], log β occurs in the range 14.60(1)–17.14(1), with the lowest value obtained for the cationic complex of thiocholine, [Formula: see text]. Acid dissociation constants for the ligands are reported. Formation constants for the addition of both one and two equivalents of MeHg(II) to L-cysteine have been determined, giving log K ca. 4.1 for the reaction[Formula: see text]occurring at low pH, and log K 8.8 for the reaction[Formula: see text]occurring at higher pH.

Studies on Lactoperoxidase. VI. Kinetics of the Oxidation of p-Cresol by Compound II

1973 ◽  
Vol 51 (11) ◽  
pp. 1721-1723 ◽  
Author(s):  
R. James Maguire ◽  
H. Brian Dunford
Keyword(s):  
Dissociation Constants ◽  
Acid Dissociation ◽  
Stopped Flow ◽  
Acid Dissociation Constants ◽  
First Order ◽  
Diffusion Controlled ◽  
Ph Range ◽  
Rate Profile ◽  
Compound Ii ◽  
Kinetics Of

The kinetics of the oxidation of p-cresol by compound II of lactoperoxidase have been studied over the pH range 2.1–11.2 by the stopped-flow technique. The reaction is kinetically first-order with respect to p-cresol over the entire pH range. Use is made of the diffusion-controlled limit that can be placed on a bimolecular rate constant to show that p-cresol reacts in the unionized form. The complexity of the pH-rate profile is discussed in terms of acid dissociation constants of groups in the enzyme and the ionization of the substrate.

Analyses of the Acid Dissociation Constants of Multisubstituted Diarylamines Measured in Solvents and Micellar System

1994 ◽  
Vol 67 (3) ◽  
pp. 800-806 ◽  
Author(s):  
Ze-jian Guo ◽  
Hideto Miyoshi ◽  
Toshio Fujita
Keyword(s):  
Dissociation Constants ◽  
Acid Dissociation ◽  
Micellar System ◽  
Acid Dissociation Constants
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