LANGMUIR-BLODGETT-FILM FORMATION AND SPECTROSCOPIC CHARACTERIZATION OF SULFONATED DERIVATIVES OF ZINC PHTHALOCYANINE

Langmuir film formation characteristics of two sulphonated derivatives of zinc phthalocyanine, zinc 11,18,25-tri(tert-butyl)-4-sulphophthalo cyaine (Na[ZnPc(t)SO(3)]) and zinc dodecafluoro-4-sulphophthalocyanine (Na[ZnPcF(12)SO(3)]), were studied, The surface pressure-area isother m of Na[ZnPc(t)SO(3)] showed distinct gaseous, liquid and solid phases , whereas that corresponding to Na[ZnPcF(12)SO(3)] followed the trend of other phthalocyanine derivatives that lack amphiphilic character, T he floating films were transferred to several substrates, The starting materials and the Langmuir-Blodgett films were characterized using ul traviolet-visible, Fourier transform infrared, Raman, resonant Raman a nd surface-enhanced resonant Raman spectroscopy, A relationship betwee n the molecular organization in the films and the nature of the substi tuents is inferred from the spectroscopic data.