ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 32, Number 5
JKCSEZ 32(5)
October 20, 1988 

The complex formation of p-aminoazobenzene and its derivatives with Fe(Ⅲ) and Mn(Ⅱ) has been studied by UV and IR spectroscopy and conductometry. The effects of solvents, donor basicity, and other factors on the formation of these complexes have been examined. The vatio of metal to ligand for the complexes formed is 1 : 1, both in the solid state and in solution. The stability constants of Fe(Ⅲ)-donor and Mn(Ⅱ)-donor complexes are in the range of 102∼104 and 0.1∼1, respectively. The absorptivities are ~104 and ∼103 l/mol·cm respectively. Thermodynamic properties such as ΔH。, ΔG。 and ΔS。 are calculated from their stability constants utilizing Van't Hoff equation.