Formation of Metal‐Assisted Stable Double Helices in Dimers of Cyclic Bis‐Tetrapyrroles that Exhibit Spring‐Like Motion |
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| Authors: | Takashi Hashimoto Takuma Nishimura Jong Min Lim Prof?Dr Dongho Kim Prof?Dr Hiromitsu Maeda |
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| Institution: | 1. College of Pharmaceutical Sciences, Institute of Science and Engineering, Ritsumeikan University, Kusatsu 525‐8577 (Japan), Fax: (+81)?77‐561‐2659;2. Department of Chemistry, Yonsei University, Seoul 120‐749 (Korea);3. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332‐0012 (Japan) |
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| Abstract: | Bidipyrrin‐bridged macrocycles, prepared from NiII‐bridged dipyrrin‐based nanorings by intramolecular oxidative biaryl coupling reactions, yielded 2+4]‐type ZnII‐assisted stable twisted‐ring dimers comprising two double helices. These 2+4]‐type metal complexes can be optically resolved by chiral HPLC and exhibit tunable electronic and optical properties as a result of spring‐like motions. The double helices behave as glue to connect two macrocycles and as the screws of hinges to form thermally responsive synchronized spring systems. |
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| Keywords: | chirality coordination compounds heterocycles macrocycles self‐assembly |
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