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[摘要]：An achiral and chiral poly(dithieno[3,2-b:2',3'-d]pyrrole) (PDTP), substituted with a gallic acid-derived moiety, was prepared by a Stille coupling, and the supramolecular behavior in solution was studied. In a good solvent (THE), the polymers are present as unordered, highly conjugated, rigid-rod-like strands. Upon addition of a nonsolvent (hexane) or in toluene, the polymer strands adopt a helical conformation in contrast to previously reported alkyl-substituted PDTPs, which aggregate by decreasing the solvent quality. The folding and unfolding process was investigated by probing the UV-vis and CD intensifies at different wavelengths and temperatures. On the basis of these experiments, it could be concluded that the helical folding and unfolding is a single-step process. The PDTP could also be oxidized and rereduced, and thus, in principle, a molecular solenoid can be obtained. |
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