Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   SUMMER 2006 , Volume 16 , Number 60 (CHEMISTRY ISSUE); Page(s) 1 To 11.
 
Paper: 

INVESTIGATION OF THE EFFECT OF E AND F PARAMETERS ON THE MINIMIZED ERROR FUNCTION IN THE CALCULATION OF STABILITY CONSTANTS FOR TUNGSTEN (VI) AND MOLYBDENUM (VI) COMPLEXES WITH NITRILOTRIACETIC ACID AND GLUTAMIC ACID AT DIFFERENT IONIC STRENGTHS

 
 
Author(s):  MAJLESI K.*, ZARE KARIM
 
* CHEMISTRY DEPARTMENT, SCIENCE AND RESEARCH CAMPUS, ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

The formation constants of species formed in the systems H++W (VI) + nitrilotriacetic acid and H++ nitrilotriacetic acid have been determined in aqueous solution for pH=4-9 at 25oC and different ionic strengths ranging from (0.1 to 1.0) mol dm-3 (NaClO4), using potentiometric and spectrophotometric techniques. It was shown that tungsten (VI) forms a mononuclear 1:1 complex with NTA of the type (WO3L3-) at pH=7.5. The composition of the complex was determined by the continuous variations method.
The complexation of molybdenum (VI) with glutamic acid was investigated in aqueous solution ranging in pH from 4 to 9, using polarimetric, potentiometric and spectrophotometric techniques. The composition of the complex was determined by the continuous variations method. It was shown that molybdenum (VI) forms a mononuclear 1:1 complex with glutamic acid of the type (MoO3L2-) at pH=6.0. The dissociation constants of glutamic acid and the stability constants of the complex were determined at 25oC and at ionic strengths ranging from (0.1 to 1.0) mol dm3- sodium perchlorate.
In both complex formation reactions by introducing two new parameters, E and F, the dependence of the dissociation and stability constants on ionic strength is described by a Debye-Huckel type equation and the effect of the aforementioned parameters on the minimized error function is discussed. Finally, a comparison has been made between the patterns of ionic strength dependence for the two complexes and the results have been compared with data previously reported.

 
Keyword(s): IONIC STRENGTH, TUNGSTEN (VI), MOLYBDENUM (VI), NTA, GLUTAMIC ACID, STABILITY CONSTANT, ERROR FUNCTION
 
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