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
