Abstract: The film forming properties of 5,10,15,20-tetra-(4-N,N,N-dimethylhexadecyl aminophenyl) porphyrin (TDMC₁₆ PP) on the air/water interface was studied. Multilayers of amphiphilic porphyrin were built up on the glass and quartz substrate. The structure of LB films was characterized by UV-Vis absorption spectra, polarized UV Vis absorption spectra, fluorescence spectra, and low-angle X ray diffraction (LAXD). The experimental results indicated that TDMC₁₆ PP has good film forming performance, TDMC₁₆ PP LB films have good stability, homogeneity, and periodicity, the long alkyl chains are not straight and the porphyrin macroring in LB films lay on the substrate with a tilted angle 42.5°.

Key words: amphiphilic porphyrin, LB films