Thanks to their remarkable features (energy band gap in the IR-Vis region, high mobilities of charge carriers, significant electroluminescence, photophysical characteristics, high processability and versatility), organic semiconducting materials are regarded as a viable alternative to inorganic semiconductors in molecular electronics - the new low cost flexible electronics [1-3]. We report here the electric transport properties in thin films of some new pyrrolo[1,2-i][1,7]-phenanthroline derivatives. The target compounds were obtained using the strategy involving cycloimmonium ylides as 1,3dipol intermediates. Thus1,7-phenanthrolinium ylides generated in situ from the corresponding monoquaternary salts in basic medium, underwent 3+2 cyclization in the presence of reactive dipolarophiles. Temperature dependences of electric conductivity of the synthesized compounds are studied. Thinfilm samples spin-coated from dichloromethane solutions onto glass substrates were used, after they were submitted to a heat treatment. The crystalline structure and surface morphology of samples have been investigated by XRD technique. The studied polycrystalline compounds show typical semiconductor behaviour. Some correlations between semiconducting parameters and molecular structure of the organic compounds have been discussed. The investigated compounds hold promise for thermistor applications.