Abstract: The monolayers on the water surface were studied by pressure-area isotherms, with five metalloporphyrins and metallophthalocyanines bearing differential substi-tuents. From the limiting areas together with the molecular model, probable orientation of maerocycle in the monolayer and the oriented effect of substituents upon the mac-rocycles were considered. These monolayer were transferred to the substrates by L-B method. The UV-vis spectra of the L-B films and in solution were measured. The results showed that there were aggregates in the L-B films of metallophthalocyanines while not in the L-B films were examined by polarized UV-vis absorbance. It was confirmed that orientation in L-B films inherently depends upon those molecular states spreading monolayers on the water surface. According to this result, by introducing appropriate substitutents into porphyrin or phthalocyanine ring the molecular orientation and stracking in the L-B films could be controlled.

Key words: Porphyrin, Phthalocyanine, L-B films, П-A curves, Conjugate macrocycle, Molecular orientation