Extraction and stability constants of copper complexes of 1,5-diphenylcarbazone

1966 ◽  
Vol 36 ◽  
pp. 537-540 ◽  
Author(s):  
H.R. Geering ◽  
J.F. Hodgson
Keyword(s):  
Stability Constants ◽  
Copper Complexes ◽  
Extraction And Stability Constants

scholarly journals Distribution of micro-amounts of europium in the two-phase water-HCl-nitrobenzene-N,N'-dimethyl-N,N'-diphenyl-2,6-dipicolinamide-hydrogen dicarbollylcobaltate extraction system

2009 ◽  
Vol 74 (7) ◽  
pp. 781-787 ◽  
Author(s):  
Emanuel Makrlík ◽  
Petr Vaňura ◽  
Pavel Selucký ◽  
Vasily Babain ◽  
Ivan Smirnov
Keyword(s):  
Stability Constants ◽  
Organic Phase ◽  
Extraction And Stability Constants ◽  
Extraction System ◽  
Hydrogen Dicarbollylcobaltate ◽  
Nitrobenzene Solution ◽  
Two Phase ◽  
Equilibrium Data ◽  
Phase Water

Extraction of micro-amounts of europium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of N,N'-dimethyl- -N,N'-diphenyl-2,6-dipicolinamide (MePhDPA, L) was investigated. The equilibrium data were explained assuming that the species HL+, + HL2 , 3+ EuL2 and 3+ EuL3 are extracted into the organic phase. The values of the extraction and stability constants of the species in nitrobenzene saturated with water were determined.

Stability constants for copper complexes of substituted salicylic acids

1981 ◽  
Vol 43 (11) ◽  
pp. 3019-3022 ◽  
Author(s):  
V.P. Gupta ◽  
J.K. Sthapak ◽  
D.D. Sharma
Keyword(s):  
Stability Constants ◽  
Copper Complexes ◽  
Salicylic Acids

scholarly journals Calcium ionophore I as very effective extraction agent for trivalent europium and americium

2019 ◽  
Vol 84 (2) ◽  
pp. 199-209
Author(s):  
Emanuel Makrlík ◽  
Petr Vaňura
Keyword(s):  
Solvent Extraction ◽  
Stability Constants ◽  
Calcium Ionophore ◽  
Extraction And Stability Constants ◽  
Hydrogen Dicarbollylcobaltate ◽  
Cationic Complex ◽  
Complex Species ◽  
Equilibrium Data ◽  
Extraction Agent ◽  
Europium And Americium

The solvent extraction of microamounts of Eu3+ and Am3+ from water into nitrobenzene by means of a mixture of hydrogen dicarbollylcobaltate (H+B-) and calcium ionophore I (marked as the ligand L) was investigated. The equilibrium data have been explained assuming that the species HL+, HL2 +,ML2 3+ and ML3 3+ (M3+: Eu3+ or Am3+) are extracted into the organic phase. The extraction and stability constants of the cationic complex species in nitrobenzene saturated with water have been determined and discussed. It was proven experimentally that the ligand L could be considered as a very strong receptor for Eu3+ and Am3+.

Extraction of 133Ba with Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the Presence of Dibenzo-18-crown-6

1998 ◽  
Vol 63 (3) ◽  
pp. 338-346 ◽  
Author(s):  
Petr Vaňura ◽  
Emanuel Makrlík
Keyword(s):  
Stability Constants ◽  
Extraction And Stability Constants ◽  
Nitrobenzene Solution ◽  
Nitrobenzene Phase ◽  
Equilibrium Data

Extraction of barium with the nitrobenzene solution of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the presence of dibenzo-18-crown-6 (DB18C6, L) has been investigated. The equilibrium data and typical maxima in the dependences of the Ba distribution ratios on the analytical concentration of DB18C6 in the system can be explained assuming that the species Ba2+, BaL2+, BaL22+, BaHL3+ and BaHL23+ to be extracted into the nitrobenzene phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

The Effect of Aromatic Amines on the Catalyzed Decarboxylation of 3-Oxo-glutaric Acid

1972 ◽  
Vol 50 (22) ◽  
pp. 3573-3586 ◽  
Author(s):  
K. N. Leong ◽  
M. W. Lister
Keyword(s):  
Ionic Strength ◽  
Stability Constants ◽  
Rate Constants ◽  
Aromatic Amines ◽  
Copper Complexes ◽  
Glutaric Acid ◽  
Equilibrium Constants ◽  
Nickel Compound ◽  
Ph Measurements ◽  
Cobalt Nickel

Equilibrium constants have been measured for the formation of MA species, where M is divalent manganese, cobalt, nickel, or zinc, and A2− is the 3-oxo-glutarate ion. Equilibrium constants have also been measured for the reactions [Formula: see text], where B is 2,2′-bipyridyl or 1,10-phenanthroline. These constants were obtained by pH measurements at 25 °C and an ionic strength of 0.60. The results are compared with those for similar systems, especially as regards the tendency to form ternary mixed complexes of the type MAB.The rates of decarboxylation of the various MA and MAB species have been measured. The resulting rate constants follow the Irving–Williams order for stability constants, except that in both MAB species the cobalt compound decomposed slightly faster than the nickel compound. The aromatic base, which had been found earlier to have very little effect in copper complexes, increased the rate constants appreciably with other metals, especially with manganese and zinc. Usually 1,10-phenanthroline has a larger effect than 2,2′-bipyridyl. Some possible explanations of the results are considered.

Measurement of Complexing Materials Excreted from Algae and Their Ability to Ameliorate Copper Toxicity

1979 ◽  
Vol 36 (8) ◽  
pp. 901-905 ◽  
Author(s):  
C. M. G. Van den Berg ◽  
P. T. S. Wong ◽  
Y. K. Chau
Keyword(s):  
Stability Constants ◽  
Copper Complexes ◽  
Copper Toxicity ◽  
Copper Ion ◽  
Ion Concentration ◽  
Conditional Stability ◽  
Exchange Method ◽  
Ionic Copper ◽  
Conditional Stability Constants ◽  
Algal Exudates

The complexing capacities of three algal exudates and the conditional stability constants of their copper complexes have been determined by an ion exchange method. Their ability to ameliorate copper toxicity towards the primary production of Chlorella vulgaris is related to the conditional stability constants, which regulate the ionic copper concentration. Anabaena cylindrica, Navicula pelliculosa, and Scenedesmus quadricauda excreted 6.73, 2.86, and 0.66 μmol/L of complexing ligands, respectively, with conditional stability constants of 107.7, 108.1, and 108.6, respectively, for their corresponding copper complexes. When these constants were applied in calculations, a free copper ion concentration of 10−10.3 mol/L was found in each exudate. Key words: algal exudates, free copper ion concentration, complexing capacity, copper ion toxicity, primary productivity

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