Spin dynamics studies in polyalkylthiophenes and polystyrene polythiopbene copolymers

Summary form only given. The aim of our studies is to evaluate the role of structural and morphological parameters on the dynamics of polarons in polythiophenes, at the microscopic scale. Parameters like inter-chain distances and stereoregularity of alkyl substituted polythiophenes are considered, as well as the case of crystalline polythiophene micellas embeded in a polystyrene matrix. Proton spin lattice relaxation time has been measured as a function of frequency in poly(dimethyl-tetrathiophene), poly(hexyl d/sub 13-/ thiophene) and polystyrene(deuterated)-polythiophene diblock copolymer. All the compounds were prepared using FeC1/sub 3/ as the polymerizing agent of thiophenic units, then carefully dedoped and redoped with BF/sub 4/sup -// counterions to avoid spurious relaxation coming from extrinsic paramagnetic species. The data will be analyzed in the framework of quasi 1-D polaron diffusion, thus leading to the determination of intra- and inter-chain diffusion coefficients. The results will be then compared with previous ones obtained in poly(bithiophene) and poly(methyl-thiophene).