Electronic Absorption Spectra of Copper Phthalocyanine Dye

Abstract

The electronic absorption of Cu phthalocyanine dye has been measured
at room temperature in four solvents of different polarity and from
which oscillator strength has been calculated. The measured band shift
and intensities provide evidence for the assigment of the possible electronic
transitions. The longest wavelength band which appears at 727
nm with higher intensity has been assigned as the charge transfer barid
resulting in charge transfer from the phthalocyanine ligand to the copper
central atom of the dye molecule.