STRUCTURAL STUDY OF SPIN-COATED AND LB FILMS OF MONOMERIC AND OLIGOMERIC PHTHALOCYANINES

The Langmuir monolayer and Langmuir-Blodgett (LB) deposition behaviour of asymmetrically substituted 1,4-bis(6-hydroxyhexyl)-8,11,15,18,22,25-hexa-octylphthalocyanine (1) and a phthalocyanine dimer (2) and trimer (3) have been investigated. The materials were also deposited onto glass by the spin coating (SC) technique. The spin coated films were exceptionally smooth, even and free from crystallites. X-ray reflectivity measurements reveal varying degrees of order. Unpolarized UV-visible absorption spectra of the films deposited by the two techniques were closely similar. The LB technique has the advantage of introducing some degree of anisotropic ordering of the molecules within the films of the monomer and dimer whereas the SC method has the advantage of convenience.