A SPECTRAL STUDY OF AGGREGATES OF CHRYSENE IN AN ETHANOL-WATER MIXTURE AND IN LANGMUIR-BLODGETT-FILMS

Mono- and multilayers of chrysene mixed with stearic acid have been in corporated into Langmuir-Blodgett (LB) films. This is itself of intere st due to the nonamphiphilic nature of chrysene. Repulsive interaction between chrysene and the fatty acid have been observed. Absorption sp ectra of chrysene films have been compared with that of solution. A st riking similarity between emission spectra of chrysene in LB film and in an ethanol-water mixture has been observed and compared with chryse ne microcrystal emission spectra. The repulsive interaction along with the spectroscopic studies have been discussed in the framework of agg regates or two-dimensional crystals of chrysene in LB films. :The poss ibility of any structural phase transition has been ruled out from the excitation spectra.