Preparation of organic metal nanocrystals in polymer matrix

Nanocrystals of bis(ethylenedithio)tetrathiafulvalene (ET) polyiodides in p olymer matrices were obtained using different methods of crystallisation un der limited diffusion conditions. Broadening X-ray diffraction (MID) lines and atomic force microscopy (AFM) confirm the decreasing size of the crysta ls. The positions of the W-Vis absorption maxims are practically the same; IR peaks show a small shift of the CT band as compared with microcrystallin e layers. Raman spectra and XRD show that, even above 390 K, alpha-ET2I3 is formed in contrast to beta(co)-ET2I3 phase microcrystals formed above 370 K in solution. (C) 2000 Elsevier Science S.A. All rights reserved.