排序方式: 共有51条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(47):15109-15113
We report the three‐dimensional structure of cyclolavandulyl diphosphate (CLPP) synthase (CLDS), which consecutively catalyzes the condensation of two molecules of dimethylallyl diphosphate (DMAPP) followed by cyclization to form a cyclic monoterpene, CLPP. The structures of apo‐CLDS and CLDS in complex with Tris, pyrophosphate, and Mg2+ ion were refined at 2.00 Å resolution and 1.73 Å resolution, respectively. CLDS adopts a typical fold for cis‐prenyl synthases and forms a homo‐dimeric structure. An in vitro reaction using a regiospecifically 2H‐substituted DMAPP substrate revealed the intramolecular proton transfer mechanism of the CLDS reaction. The CLDS structure and structure‐based mutagenesis provide mechanistic insights into this unprecedented terpene synthase. The combination of structural and mechanistic insights advances the knowledge of intricate terpene synthase‐catalyzed reactions. 相似文献
6.
7.
8.
Changhong Wang Hongchao Yang Yejun Zhang Qiangbin Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(18):6160-6164
Tuning the crystal phase of metal alloy nanomaterials has been proved a significant way to alter their catalytic properties based on crystal structure and electronic property. Herein, we successfully developed a simple strategy to controllably synthesize a rare crystal structure of hexagonal close‐packed (hcp) NiFe nanoparticle (NP) encapsulated in a N‐doped carbon (NC) shell (hcp‐NiFe@NC). Then, we systemically investigated the oxygen evolution reaction (OER) performance of the samples under alkaline conditions, in which the hcp‐NiFe@NC exhibits superior OER activity compared to the conventional face‐centered cubic (fcc) NiFe encapsulated in a N‐doped carbon shell (fcc‐NiFe@NC). At the current densities of 10 and 100 mA cm?2, the hcp‐NiFe@NC with Fe/Ni ratio of ≈5.4 % only needs ultralow overpotentials of 226 mV and 263 mV versus reversible hydrogen electrode in 1.0 m KOH electrolyte, respectively, which were extremely lower than those of fcc‐NiFe@NC and most of other reported NiFe‐based electrocatalysts. We proposed that hcp‐NiFe possesses favorable electronic property to expedite the reaction on the NC surface, resulting higher catalytic activity for OER. This research provides a new insight to design more efficient electrocatalysts by considering the crystal phase correlated electronic property. 相似文献
9.
10.
Xuexiang Li Yongtao Zhu Jiafeng Shao Baolin Wang Shangxi Zhang Yongliang Shao Xiaojie Jin Xiaojun Yao Ran Fang Xiangfeng Shao 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2014,126(2):545-548
Trichalcogenasumanenes were synthesized on a multigram scale through a two‐step approach that takes advantage of non‐pyrolytic cyclization and solventless ring contraction. Solid‐state structure and photophysical investigations demonstrate that these compounds are promising candidates for electronic materials. 相似文献