Tetrakis-4-(2,4-di-amylphenoxy) phthalocyaninato-polysiloxane (R4PcPS) was derived from the correspondingly substituted phthalocyaninatosilicon hydroxide (R4PcSi(OH)(2)). The photoluminescence and excitation spectra of R4PcPS and P4PcSi(OH)(2) solutions in chloroform were shown. The absorption spectra of R4PcPS Langmuir-Blodgett films, before and after adsorbing I,, were compared. The infrared absorption spectra of an asymmetrically substituted copper [tri-4-(2,4-di-amylenoxy)-mono-4-( 2-methoxyethoxy)] phthalocyanine (AsyCuPc) Langmuir-Blodgett films, before and after adsorbing NH3, were studied.