(TMTSF)(2)X materials and structural implications for low-dimensional polymeric and disordered molecular semiconductors

The structural characteristics and the relation to the electronic propertie s of three types of molecular materials are discussed. In TMTSF2X salts a t riclinic unit cell it suggested to be important in avoiding a 2k(F) Peierls distortion. In polythiophenes appropriate ordering of microcrystallites en hances the carrier mobility, and in pro chiral molecules the molecular char acteristics give rise to a modulated polar structure.