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排序方式: 共有713条查询结果,搜索用时 15 毫秒
711.
Dr. Luzia S. Germann Dr. Elvio Carlino Dr. Antonietta Taurino Dr. Oxana V. Magdysyuk Prof. Dario Voinovich Dr. Robert E. Dinnebier Dr. Dejan-Krešimir Bučar Dr. Dritan Hasa 《Angewandte Chemie (International ed. in English)》2023,62(19):e202212688
Crystal engineering has exclusively focused on the development of advanced materials based on small organic molecules. We now demonstrate how the cocrystallization of a polymer yields a material with significantly enhanced thermal stability but equivalent mechanical flexibility. Isomorphous replacement of one of the cocrystal components enables the formation of solid solutions with melting points that can be readily fine-tuned over a usefully wide temperature range. The results of this study credibly extend the scope of crystal engineering and cocrystallization from small molecules to polymers. 相似文献
712.
Dr. Weixu Liu Dr. Chang He Dr. Sijie Huang Dr. Kunfeng Zhang Dr. Wei Zhu Dr. Liping Liu Dr. Zijian Zhang Dr. Enwei Zhu Prof. Yu Chen Prof. Chen Chen Prof. Yongfa Zhu 《Angewandte Chemie (International ed. in English)》2023,62(27):e202304773
Carrier transport is an equally decisive factor as carrier separation for elevating photocatalytic efficiency. However, limited by indefinite structures and low crystallinities, studies on enhancing carrier transport of organic photocatalysts are still in their infancy. Here, we develop an σ-linkage length modulation strategy to enhance carrier transport in imidazole-alkyl-perylene diimide (IMZ-alkyl-PDI, corresponding to D-σ-A) photocatalysts by controlling π–π stacking distance. Ethyl-linkage can shorten π–π stacking distance (3.19 Å) the most among IMZ-alkyl-PDIs (where alkyl=none, ethyl, and n-propyl) via minimizing steric hindrance between D and A moieties, which leads to the fastest carrier transport rates. Thereby, IMZ-ethyl-PDI exhibits remarkable enhancement in phenol degradation with 32-fold higher rates than IMZ-PDI, as well as the oxygen evolution rate (271-fold increased). In microchannel reactors, IMZ-ethyl-PDI also presents 81.5 % phenol removal with high-flux surface hydraulic loading (44.73 L m−2 h−1). Our findings provide a promising molecular design guideline for high-performance photocatalysts and elucidate crucial internal carrier transport mechanisms. 相似文献
713.
Changtong Zhu Zhenbo Yuan Zhiwei Deng Dejing Yin Yan Zhang Jingwen Zhou Yijian Rao 《Angewandte Chemie (International ed. in English)》2023,62(50):e202311762
New-to-nature biocatalysis in organic synthesis has recently emerged as a green and powerful strategy for the preparation of valuable chiral products, among which chiral oxygen-containing benzo-fused heterocycles are important structural motifs in pharmaceutical industry. However, the asymmetric synthesis of these compounds through radical-mediated methods is challenging. Herein, a novel asymmetric radical-mediated photoenzymatic synthesis strategy is developed to realize the efficient enantioselective synthesis of oxygen-containing benzo-fused heterocycles through structure-guided engineering of a flavin-dependent ‘ene’-reductase GluER. It shows that variant GluER-W100H could efficiently produce various benzoxepinones, chromanone and indanone with different benzo-fused rings in high yields with great stereoselectivities under visible light. Moreover, these results are well supported by mechanistic experiments, revealing that this photoenzymatic process involves electron donor-acceptor complex formation, single electron transfer and hydrogen atom transfer. Therefore, we provide an alternative green approach for efficient chemoenzymatic synthesis of important chiral skeletons of bioactive pharmaceuticals. 相似文献