Abstract:
In this research work, the acid dissociation constants of 4-(4-nitrophenylazo)
resorcinol = L1 and the formation constant of the metal chelates formed by
this ligand with Co(II), Cu(II), and Zn (II) have been determined
Potentiometrically at 288K in 75% ethanol-water mixture at 0.1M KNO3
ionic strength against 0.1 M KOH. The stability constants of metal complexes
were detected at different temperatures.
The thermodynamics parameters such as ΔG, ΔH and ΔS of binary
complexes were determined using the Vant-Hoff equations to measure the
effect of temperature on the stability of 4-(4-nitrophenylazo) resorcinol
complexes with metal ion. The influence of solvents on the free ligand and
their metal complexes have been determined and discussed
