Potentiometric determination of the formation constants of 2-mercapto-3-phenylpropenoate with zinc(II), nickel(II) and hydrogen ions

1987 ◽  
Vol 84 ◽  
pp. 93-98 ◽  
Author(s):  
M Filella ◽  
N Garriga ◽  
A Izquierdo
Keyword(s):  
Formation Constants ◽  
Potentiometric Determination ◽  
Hydrogen Ions

Potentiometric Determination of Stability Constants of Trivalent Metal Ion Complexes with Di-p-tolyl-thiovioluric Acid

1976 ◽  
Vol 31 (8) ◽  
pp. 1096-1098 ◽  
Author(s):  
Pavan Mathur ◽  
D. P. Goel ◽  
R. P. Singh
Keyword(s):  
Stability Constants ◽  
Atomic Number ◽  
Metal Ion ◽  
Formation Constants ◽  
Potentiometric Determination ◽  
Trivalent Metal ◽  
Ionic Radii ◽  
Metal Ion Complexes

The consecutive formation constants of 1:1, 2:1, 3:1 chelate species formed by the interaction of di-p-tolyl-thiovioluric acid (D-p-TOTVA) with the tripositive lanthanons and yttrium cations were determined potentiometrically at 0.1 µ (NaClO4) at 30± 1°C, in 75% aqueous dioxan.The 1:1 formation constants (log K1) for the complexes increase with the increase in the atomic number of the lanthanon (3), with a break at gadolinium.The results indicate that the ligand bonds bidentately to heavier lanthanons (smaller ionic radii). However, definite dentate character of bonding to lighter (larger ionic radii) lanthanons could not be established.

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