The cis-bis(decanoate)tin phthalocyanine/DPPC film at the air/water interface

► Films of a tin phthalocyanine and DPPC at the water/air interface were observed. ► Compression isotherms of tin phthalocyanine/DPPC films were obtained. ► Films present phase separation domains enriched in tin phthalocyanine. ► Phase separation domains present optical anisotropy and molecular order. ► A model for a pure tin phthalocyanine film was developed at the air/water interface.