The substitution pattern of oligothienylenevinylenes (see Figure) exerts a determining effect on the packing arrangement of individual oligomers in the solid state, and thus on field-effect mobility. These two parameters are tightly correlated to the propensity of the corresponding cation radical to dimerize in solution. The analysis of the π-dimerization of conjugated cation radicals in solution could be used to screen new candidates for devices.
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