| Abstract
| - We have established a series of synthetic methods to synthesize alkyl-substituted fused thiophenes withdegrees of fusion from two to seven rings. These fused thiophene ring compounds have very good solubilityin common organic solvents, making possible the solution processing of these compounds for electronicapplications. The UV absorption of these fused thiophenes is blue-shifted when compared with theirhydrocarbon counterparts. The larger band gaps result in much better stability. Single-crystal X-ray resultsfor 3,6-didecanyldithieno[2,3-d:2‘,3‘-d‘]thieno[3,2-b:4,5-b‘ ‘]dithiophene (FT5) and 3,7-didecanylthieno[3,2-b]thieno[2‘,3‘:4,5]thieno[2,3-d]thiophene (FT4) demonstrate that both compounds form π-stackingstructures instead of a herringbone-type of packing motif. This more favorable π-stacked structure maylead to better material electronic properties such as mobility in devices fabricated with these compounds.
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