Abstract: Holmium (III) complexes with three aminopyridine derivatives as ligands have been investigated for intensity parameters in alcoholic and micellar medium. Triton X-100 surfactant used for micellar medium. The Electronic spectra were recorded in ultraviolet-visible range. The maximum value of oscillator strength in alcoholic medium was 91.88, while the maximum value in micellar medium was 0.9519 for Holmium complex with N2P4HB.

Keywords: Physicochemical Parameters, micellar medium, ultraviolet-visible range.