Compounds of molybdenum(VI) with aspartic acid: A spectrophotometric and potentiometric study of the formation and interconversion equilibria in aqueous solution

1990 ◽  
Vol 15 (6) ◽  
pp. 425-428 ◽  
Author(s):  
Anfonio Dom�nech ◽  
Elisa Llopis ◽  
Enrique Garcia-Espa�a ◽  
Antonio Cervilla
Keyword(s):  
Aqueous Solution ◽  
Aspartic Acid ◽  
Potentiometric Study ◽  
Equilibria In Aqueous Solution

Equilibria in aqueous solution between beryllium(II) and d,l-aspartic acid and d,l-methionine

Polyhedron ◽  
1989 ◽  
Vol 8 (16) ◽  
pp. 2017-2022 ◽  
Author(s):  
A. Mederos ◽  
E. Medina ◽  
J.J.Alvarez Colomer ◽  
F. Brito
Keyword(s):  
Aqueous Solution ◽  
Aspartic Acid ◽  
Equilibria In Aqueous Solution

Schiff base equilibria. II. Beryllium complexes of N-n-butylsalicylideneimine and the hydrolysis of the Be2+ ion

1965 ◽  
Vol 18 (5) ◽  
pp. 651 ◽  
Author(s):  
RW Green ◽  
PW Alexander
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Complex Formation ◽  
Distribution Coefficient ◽  
Dilute Aqueous Solution ◽  
The Stability ◽  
Ph Range ◽  
Hydrolysis Of ◽  
Beryllium Complexes ◽  
Equilibria In Aqueous Solution

The Schiff base, N-n-butylsalicylideneimine, extracts more than 99.8% beryllium into toluene from dilute aqueous solution. The distribution of beryllium has been studied in the pH range 5-13 and is discussed in terms of the several complex equilibria in aqueous solution. The stability constants of the complexes formed between beryllium and the Schiff base are log β1 11.1 and log β2 20.4, and the distribution coefficient of the bis complex is 550. Over most of the pH range, hydrolysis of the Be2+ ion competes with complex formation and provides a means of measuring the hydrolysis constants. They are for the reactions: Be(H2O)42+ ↔ 2H+ + Be(H2O)2(OH)2, log*β2 - 13.65; Be(H2O)42+ ↔ 3H+ + Be(H2O)(OH)3-, log*β3 -24.11.

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