From reticulate doped to nanostructural polymeric systems

Preparation of very small or nanoscopic crystallites applying wet techniques and their properties are discussed. It is shown that controlled evaporation of the solvent from the solution containing low molecular weight CT complexes and polymers leads to formation of continuous networks of microcrystallites, which are responsible for the magnetic, optical and particularly electrical properties of the obtained systems (isotropic, surface or anisotropic conductivity). Using a variation of this method one can obtain very small crystals of CT complex salts or other substances showing nonlinear optical properties. Application of the so-called “droplet technique” results in formation of the emulsion of the crystallizable compounds. The crystallization in small droplets leads to very small crystals which show, because of their nanoscopic size, different properties than bigger single crystals of these compounds.