Formation Constants of some Metal Derivatives: S-Alkyl Carboxylic Acids

1956 ◽  
Vol 60 (10) ◽  
pp. 1427-1429 ◽  
Author(s):  
Roger J. Irving ◽  
W. Conard Fernelius
Keyword(s):  
Carboxylic Acids ◽  
Formation Constants ◽  
Metal Derivatives

Comparison of calcium complexation of some carboxylic acids derived from D­glucose and D-fructose

1995 ◽  
Vol 73 (8) ◽  
pp. 1338-1347 ◽  
Author(s):  
Hélène Bazin ◽  
Gérard Descotes ◽  
Alain Bouchu ◽  
Michelle Petit-Ramel
Keyword(s):  
Molecular Structure ◽  
Complex Formation ◽  
Carboxylic Acids ◽  
Formation Constants ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Complex Formation Constants ◽  
Calcium Complexation ◽  
C Nmr

The aim of this work was to compare calcium sequestering behaviour of 11 carboxylic acids derived from carbohydrates, and to study the influence of molecular structure on the calcium complexation. For this purpose, various carboxylic acids derived from methyl D-glucopyranoside, methyl D-fructopyranoside, and methyl D-fructofuranoside were synthesized and studied using an ion selective electrode to determine calcium complex formation constants. Complexation sites of carbohydrate skeletons were determined using 13C NMR. Keywords: Ca(II) complexation, carboxylic acids, fructofuranosides, fructopyranosides, glucopyranosides.

Fluorinated alkoxides. Part XI. Studies on highly fluorinated amino-alcohols and their metal derivatives

1977 ◽  
Vol 55 (13) ◽  
pp. 2465-2472 ◽  
Author(s):  
In-Soon Chang ◽  
Christopher J. Willis
Keyword(s):  
Donor Site ◽  
Amino Alcohols ◽  
Formation Constants ◽  
Intramolecular Proton Transfer ◽  
Nitrogen Donor ◽  
Metal Derivatives ◽  
Fluorinated Alcohol ◽  
Fluorinated Alkoxides ◽  
Trifluoromethyl Groups ◽  
Steric Influence

We describe the synthesis of a number of difunctional molecules in which the fluorinated tertiary alcohol grouping, -C(CF3)20H, is combined with a nitrogen donor site such as an amino-group or a pyridine ring. In all cases, zwitterionic behaviour in solution is found resulting from intramolecular proton transfer from the acidic fluorinated alcohol to the nitrogen, and this sometimes persists in the solid state, e.g. NH2CH2CH2C(CF3)20H exists as the dipolar ion +NH3CH2CH2C(CF3),0-. Measurements of pK values suggest that the behaviour of the fluorinated amino-alcohols may be compared with that of the amino-acids, subject to changes to be expected from the lower acidity of the -C(CF3)20H group. Metal complexes of the fluorinated amino-alcohols form readily; specifically, neutral complexes of Co2+, Ni2+, and Cu2+ of formula M(L),, where L is an ionized amino-alcohol chelating through the ionized hydroxy group and the nitrogen atom. Measurements of formation constants show that the six-membered chelate rings are the most stable, while a comparison of the stabilities of fluorinated amino-alkoxy complexes with those of analogous aminoacids shows that the former are less stable: this is attributed to the steric influence of the trifluoromethyl groups.

Polyether carboxylic acids incorporating a benzodioxinic subunit: synthesis and complexing ability of sodium and potassium

1992 ◽  
Vol 70 (3) ◽  
pp. 828-835 ◽  
Author(s):  
Pascal Bosseray ◽  
Gérard Coudert ◽  
Gérald Guillaumet ◽  
Georges Jeminet ◽  
Madeleine Tissier ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Formation Constants ◽  
Side Chain ◽  
Complexing Ability ◽  
Potentiometric Measurements ◽  
Sodium And Potassium

We report here the synthesis of new polyoxygenated macrocyclic derivatives with a benzodioxinic subunit and a carboxylic side chain (2, 3), along with some of their corresponding acyclic polyethers (1). Formation constants of sodium and potassium complexes with both the acid and anion forms of these compounds were obtained from potentiometric measurements. The enhancement of both complexing ability and selectivity afforded by the presence of a carboxylic side chain is discussed. Keywords: polyether carboxylic acids, macrocycles, benzo-1,4-dioxin, sodium and potassium complexes, solvent methanol.

Tetrabenzoporphyrins: Metal Incorporation and Exchange Kinetics, Ligational Equilibria and Pulse Radiolysis Studies

1997 ◽  
Vol 01 (01) ◽  
pp. 45-54 ◽  
Author(s):  
S. CROMER ◽  
P. HAMBRIGHT ◽  
J. GRODKOWSKI ◽  
P. NETA
Keyword(s):  
Kinetic Studies ◽  
Radical Cations ◽  
Formation Constants ◽  
Solution Chemistry ◽  
Exchange Reactions ◽  
Cadmium Ion ◽  
Metal Derivatives ◽  
Exchange Kinetics ◽  
Ion Incorporation ◽  
Metal Incorporation

The solution chemistry of tetrabenzoporphyrin ( TBP ) and several of its metal derivatives were compared with that of the corresponding octaethylporphyrins. Kinetic studies were done on zinc and cadmium ion incorporation and the exchange reactions of cadmium porphyrins with zinc. Formation constants of Cd (II), Cu (II), VO (IV), Ni (II), Zn (II) and Mg (II) porphyrins with pyridine were determined for both compounds. The spectra of the radical cations of Ni (II), Mg (II) and H 2- TBP were obtained, as well as that of the radical anion of Mg (II)- TBP . Aside from the new Ni (I)- TBP , no long-lived intermediates, as noted with other porphyrins, were observed upon reduction of the tetrabenzoporphyrins. The low basicity and rigidity of the tetrabenzoporphyrin nucleus may explain many of its relative reactivity properties.

Ionic strength dependence of formation constants. Part 7. Protonation constants of low molecular weight carboxylic acids at 10, 25 and 45°C

1985 ◽  
Vol 86 ◽  
pp. 273-280 ◽  
Author(s):  
Santi Capone ◽  
Alessandro de Robertis ◽  
Concetta de Stefano ◽  
Silvio Sammartano ◽  
Rosario Scarcella ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Strength ◽  
Carboxylic Acids ◽  
Formation Constants ◽  
Protonation Constants ◽  
Low Molecular Weight ◽  
Ionic Strength Dependence ◽  
Strength Dependence

Investigations on the interactions between plutonium and synthetic water-soluble polymers

2001 ◽  
Vol 89 (6) ◽  
Author(s):  
U.C. Gerstmann ◽  
C. Lierse ◽  
K.E. Geckeler
Keyword(s):  
Acrylic Acid ◽  
Carboxylic Acids ◽  
Absorption Spectroscopy ◽  
Quaternary Ammonium ◽  
Formation Constants ◽  
Water Soluble ◽  
Counterion Condensation ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Synthetic Water

The interactions between Pu(IV) and Pu(VI), respectively, and some synthetic water-soluble polymers were investigated by absorption spectroscopy and ultrafiltration. Depending on the type of polymer plutonium can be bound by different mechanisms. Poly(acrylic acid) binds Pu(IV) and Pu(VI) by stepwise complexation, which can be observed by absorption spectroscopy. Due to chelation, some of the formation constants are greater than those from corresponding complexes with low-molecular carboxylic acids. By poly(styrenesulfonic acid) and poly(vinylesulfonic acid), Pu(IV) is bound via counterion condensation. In nitrate and chloride media, anionic Pu(IV) complexes may be bound by quaternary ammonium polymers like poly(diallydimethylammonium chloride) and permethylated poly(ethyleneimine).

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