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Hydrogen‐Bonding Induced Cooperative Effect on the Energy Transfer in Helical Polynorbornenes Appended with Porphyrin‐Containing Amidic Alanine Linkers |
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| Authors: | Zhi‐Chang Liu Dr Chih‐Hsien Chen Dr Hsian‐Wen Wang Yen‐Chin Huang Ming‐Jui Kao Tsong‐Shin Lim Prof Tien‐Yau Luh Prof |
| Institution: | 1. Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032 (China);2. Department of Chemistry, National Taiwan University, Taipei, 106 (Taiwan), Fax: (+886)?2‐2364‐4971;3. Department of Physics, Tung Hai University, Taichung, 407 (Taiwan) |
| Abstract: | Polynorbornenes appended with porphyrins containing a range of different linkers are synthesized. The use of bisamidic chiral alanine linkers between the pending porphyrins and the polymeric backbone has been shown to bring the adjacent porphyrin chromophores to more suitable orientation for exciton coupling owing to hydrogen bonding between the adjacent linkers. The hydrogen bonding between the adjacent pendants in these polymers may induce a cooperative effect and therefore render single‐handed helical structures for these polymers. Such a cooperative effect is reflected in the enhancement of FRET efficiencies between zinc–porphyrin and free base porphyrin in random copolymers. |
| Keywords: | energy transfer helical structures hydrogen bonds porphyrinoids ring‐opening polymerization |