A spectroscopic study of the interaction between copper and orthophenylenediamines

Abstract

The work reports an investigation of the interaction of Cu2+ ion with the ligand
o-Phenylenediamine (1,2-diaminobenzene). Two spectrophotometric methods namely
the continuous variations and the molar ratio were used. The continuous variations
was applied to determine whether, one complex or more is formed from the reaction
of the metal ion Cu2+ with the ligand in a given pH value.
The results which are obtained from the pervious method was affirmed by the
molar ratio method. Moreover, the effect of the experimental variables such as pH,
concentration, time and temperature upon the extent of complex formation were
studied. Also the stability constant (K) for Cu2+ complexes was calculated