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排序方式: 共有433条查询结果,搜索用时 15 毫秒
431.
Keisuke Santo Kentaro Uchida Dr. Keisuke Fujimoto Dr. Toshiyasu Inuzuka Prof. Dr. Kazutaka Hirakawa Dr. Tetsuya Sengoku Prof. Dr. Masaki Takahashi 《European journal of organic chemistry》2023,26(9):e202201479
Newly designed fluorophore systems with feather-like structures were constructed by connecting bisanthracene building units via a concise reaction sequence of bromination, etherification, and desilylation. Spectroscopic characterizations revealed that all of the fluorophore systems achieved high light absorptivity and high emission efficiency by preventing closely spaced anthracene chromophores from mutual interactions to reduce concomitant energy loss by fluorescence quenching. The application of fluorophore systems for the preparation of light-harvesting dyad materials has successfully demonstrated their potential utility as versatile photofunctional tools. 相似文献
432.
Hisayasu Ishibashi Dr. Manuel Rondelli Hiroki Shudo Prof. Dr. Takehisa Maekawa Prof. Dr. Hideto Ito Prof. Dr. Kiichi Mizukami Prof. Dr. Nobuo Kimizuka Prof. Dr. Akiko Yagi Prof. Dr. Kenichiro Itami 《Angewandte Chemie (International ed. in English)》2023,62(44):e202310613
The active metal template (AMT) strategy is a powerful tool for the formation of mechanically interlocked molecules (MIMs) such as rotaxanes and catenanes, allowing the synthesis of a variety of MIMs, including π-conjugated and multicomponent macrocycles. Cycloparaphenylene (CPP) is an emerging molecule characterized by its cyclic π-conjugated structure and unique properties. Therefore, diverse modifications of CPPs are necessary for its wide application. However, most CPP modifications require early stage functionalization and the direct modification of CPPs is very limited. Herein, we report the synthesis of a catenane consisting of [9]CPP and a 2,2′-bipyridine macrocycle as a new CPP analogue that contains a reliable synthetic scaffold enabling diverse and concise post-modification. Following the AMT strategy, the [9]CPP-bipyridine catenane was successfully synthesized through Ni-mediated aryl-aryl coupling. Catalytic C−H borylation/cross-coupling and metal complexation of the bipyridine macrocycle moiety, an effective post-functionalization method, were also demonstrated with the [9]CPP-bipyridine catenane. Single-crystal X-ray structural analysis revealed that the [9]CPP-bipyridine catenane forms a tridentated complex with an Ag ion inside the CPP ring. This interaction significantly enhances the phosphorescence lifetime through improved intermolecular interactions. 相似文献
433.
Jinhua Chen Shin Hasegawa Hitoshi Ohashi Yasunari Maekawa Masaru Yoshida Ryoichi Katakai Norio Tsubokawa 《Macromolecular rapid communications》2002,23(2):141-144
The impedance effect on the ion transport of lithium chloride through temperature‐ and pH‐sensitive gel membranes was investigated. Both conductance and loss tangent show a relatively high value at temperatures near the lower critical solution temperature (14°C), followed by an abrupt drop with a further rise in temperature. The Figure shows an example of changes in absolute complex conductance (Y ), real conductance (G ), and imaginary conductance (B) for a poly(acryloyl‐L ‐proline methyl ester) gel membrane. 相似文献