ChemInform Abstract: FORMATION CONSTANTS OF BIVALENT METAL ION COMPLEXES WITH DIPHENYL VIOLURIC ACID AND ITS HIGHER ANALOGS

1978 ◽  
Vol 9 (47) ◽  
Author(s):  
P. MATHUR ◽  
D. P. GOEL ◽  
R. P. SINGH
Keyword(s):  
Metal Ion ◽  
Formation Constants ◽  
Bivalent Metal ◽  
Metal Ion Complexes ◽  
Violuric Acid

scholarly journals Formation Constants of some Bivalent Metal Ion Chelates of N(2-hydroxy-1-naphthalidene) Anthranilic Acid (Schiff Base)

1971 ◽  
Vol 26 (9) ◽  
pp. 867-869 ◽  
Author(s):  
R. K. Mehta ◽  
V. C. Singhi ◽  
R. K. Gupta
Keyword(s):  
Schiff Base ◽  
Anthranilic Acid ◽  
Metal Ion ◽  
Formation Constants ◽  
Metal Chelates ◽  
Protonation Constants ◽  
Bivalent Metal ◽  
Transitional Metal

Protonation constants (log K1H and log K2H) of the Schiff base derived from 2-hydroxy-1-naphthaldehyde and anthranilic acid and, the formation constants of certain bivalent metal ion chelates have been determined potentiometrically in 50 per cent (vol./vol.) dioxan solutions (μ= 0.1 м NaClO4). The stabilities of these metal chelates are in the order, UO2 > Cu > Ni > Co > Zn > Cd, in which the sequence of those of first transitional metal ion chelates are in agreement with Irving and Williams order.

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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