Metachromasy of a water soluble pthalocyanine dye in the solutions and deposited Langmuir films

Abstract

This communication reports the metachromasy or the changes in shapes and positions of the absorption spectra of an anionic pthalocyanine dye Copper phthalocyanine- 3, 4′, 4″, 4″′- tetrasulfonic acid tetrasoduim salt abbreviated as TS-CuPc, in aqueous solutions and in LB films when electrostatically interacted with a well-known cationic surfactant cetyltrimethylammonium bromide abbreviated as CTAB. Critical Micellar Concentration of CTAB affected largely on the controlling of TS-CuPc molecular aggregates in the CTAB-‘TS-CuPc complex LB films. Spectroscopic studies of these LB films showed only monomeric absorption band.