SYNTHESIS OF LOW-BAND-GAP POLYMERS - A CHALLENGE FOR ORGANIC CHEMISTS

Stable intrinsic semiconductors, which exhibit conductivities of 0.1 S /cm without any doping process can be easily prepared by using our ''s hish-kebab'' approach. Hereby stacked transition metal macrocycles [Ma cM(L)](n). with M e.g. Fe, Ru, Os and Mac = phthalocyanine (Pc) or 2,3 -naphthalocyanine (2,3-Nc) are used. The bridging ligands (L) are spec ial heteroaromatic systems, e.g. s-tetrazine (tz), substituted tetrazi nes, triazine (tri), substituted triazines, but also special organic d initriles, e.g. tetrafluoroterephthalic acid dinitrile, fumarodinitril e, dicyanoacetylene, and dicyane. We report about the preparation and the characterization of the corresponding transition metal complexes [ MacM(L)](n). The intrinsic conductivities of all these compounds are a result of the low oxidation potential of the bridging ligands and due to the low lying LUMO in the corresponding bridged systems [MacM(L)]( n). The electrical and physical properties, especially the UV- and Mos sbauer spectra (for the corresponding iron compounds) for the bridged macrocyclic metal complexes are discussed in respect to the intrinsic semiconducting properties of these compounds.