STRUCTURE AND OPTICAL-PROPERTIES OF POLYCARBONATE FILMS WITH MICROCRYSTALLITES OF BEDT-TTF POLYIODIDES

The morphology, structure and optical properties of thin layers of cry stalline bis(ethylenedithio) tetrathiafulvalene (BEDT-TTF or ET) polyi odides formed within the surface layer of polycarbonate film were inve stigated. The samples: were obtained by exposing the polymer films con taining 2 wt.% of molecularly dispersed ET to vapors of I-2/CH2Cl2 sol utions of different IL concentration. X-ray diffraction, scanning elec tron microscopy (SEM) and atomic force microscopy (AFM) show that, dep ending on the preparation conditions, ET polyiodides form plate-like c rystals, Hakes and some less organized layer covering microcrystallite s. In all cases only (00/) reflexes attributed to the alpha-ET2I3 phas e were registered in the X-ray diffraction (XRD) experiments. Reaction of iodine with already formed crystals leads to new morphological str uctures. Using saturated iodine solutions the nonconducting polyiodide s are formed which, under ambient conditions, undergo transformation i nto a stable conducting salt. (C) 1998 Elsevier Science S.A. All right s reserved.