SYNTHESIS AND INVESTIGATION OF 4-METHYL-6-TERT-BUTYLTHIOFLAVILIUM DERIVATIVE POLYMETHYNE DYES AND POLYMER-FILMS ON THEIR BASIS

New polymethine dyes, 4-methyl-6-tert-butylthioflavilium derivatives, as a basis for optical recording media have been synthesized and their electronic absorption spectra in solutions and in PMMA polymer film h ave been studied. Increased concentration of the dye in PMMA matrix ha s been shown to lead after drying up of the film to dye aggregation. T he aggregates of non-symmetric dyes show the hypsochromic shift as com pared to the acetonitrile solution of the dyes (DELTAlambda(max) appro ximately 110 nm). The symmetric dye aggregation leads to the batochrom ic shift in the spectrum (DELTAlambda(max) approximately 175 nm). The relative photostability of these dye films has been determinated on ir radiation with the xenone-lamp (500 000 lx).