scholarly journals Acid Dissociation Constants of Some Histidine-containing Peptides and Formation Constants of Their Metal Complexes

1974 ◽  
Vol 47 (1) ◽  
pp. 112-117 ◽  
Author(s):  
Akira Yokoyama ◽  
Hiroji Aiba ◽  
Hisashi Tanaka
Keyword(s):  
Metal Complexes ◽  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Acid Dissociation Constants

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.

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.

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