Anisotropy of dye films deposited onto oriented PTFE sublayers

Films of various squarilium (Sq) derivatives were deposited using thermal evaporation (TE), laser beam evaporation (LBE) and plasma treatment in vacuum. A row of indolenine derivatives of Sq with various side and end groups was studied. Films had different band positions in absorption spectra that dependent on Sq structure. One absorption band in a solution was split into two peaks for the film. Dyes were deposited onto oriented polytetrafluoroethylene (PTFE) sublayers. Aligned PTFE sublayers were prepared by friction-transfer method and evaporation with consequent rubbing by a cloth. Two Sq compounds revealed oriented growth on PTFE sublayer. Thickness - dependent change in the relative intensity of shorter and longer wavelength peaks was found. Some other vacuum-deposited polymers revealed the ability to orient Sq dye after rubbing.