排序方式: 共有115条查询结果,搜索用时 31 毫秒
111.
Wang HY Si G Cao WN Wang WG Li ZJ Wang F Tung CH Wu LZ 《Chemical communications (Cambridge, England)》2011,47(29):8406-8408
A novel molecular triad [FeFe]-H(2)ase 1, and its model complexes 2 and 3 have been successfully constructed. The multistep PET and long-lived Fe(i)Fe(0) species were found to be responsible for the better performance of triad 1 than that of 2 with 3 for light-driven H(2) evolution. 相似文献
112.
Xuanang Bian Dr. Yunxuan Zhao Prof. Geoffrey I. N. Waterhouse Yingxuan Miao Dr. Chao Zhou Prof. Li-Zhu Wu Prof. Tierui Zhang 《Angewandte Chemie (International ed. in English)》2023,62(25):e202304452
Photothermal catalysis is one of the most promising green catalytic technologies, while distinguishing the effects of hot electrons and local heating remains challenging. Herein, we reported that the actual reaction temperature of photothermal ammonia synthesis over carbon-supported Ru catalyst can be measured based on Le Chatelier′s principle, enabling the hot-electron contribution to be quantified. By excluding local heating effects, we established that the activation energy via photothermal catalysis was much lower than that of thermocatalysis (54.9 vs. 126.0 kJ mol−1), stemming from hot-electron injection lowering the energy barriers for both N2 dissociation and intermediates hydrogenation. Furthermore, hot-electron injection acted to suppress carbon support methanation, giving the catalyst outstanding operational stability over 1000 h. This work provides new insights into the hot-electron effects in ammonia synthesis, guiding the design of high-performance photothermal catalysts. 相似文献
113.
Phosphorescence quenching and flash photolysis experiments demonstrate that photoinduced intra-assembly triplet-triplet energy transfer can take place via a 2-ureido-4[1H]-pyrimidinone-bridged benzophenone-naphthalene assembly I with a rate constant of 3.0 x 106 s-1 and an efficiency of 95% in CH2Cl2. This new finding suggests that with high binding strength and directionality, the 2-ureido-4[1H]-pyrimidinone hydrogen-bonded module may serve as a new model to illustrate the fundamental principles governing the triplet-triplet energy-transfer process through hydrogen bonds. 相似文献
114.
Photooxidation of olefins under oxygen in platinum(II) complex-loaded mesoporous molecular sieves 总被引:1,自引:0,他引:1
Feng K Zhang RY Wu LZ Tu B Peng ML Zhang LP Zhao D Tung CH 《Journal of the American Chemical Society》2006,128(45):14685-14690
Cyclometalated platinum(II) complex has been successfully incorporated into the (3-aminopropyl) triethoxysilane-modified channels of ordered mesoporous silica SBA-15 that has large pore hexagonal channels. Studies on the (1)O(2) generation conclusively demonstrates that the olefins in the nano-channels of SBA-15 can be enriched 8 times higher than those in the homogeneous solution as the diffusion quantum yield of singlet oxygen ((1)O(2)) is assumed to be unit. The platinum(II) complex loaded in the channel of SBA-15 is stable, and the photosensitized oxidation occurs efficiently. No obvious degradation and leaching of photosensitizers is observed even after 10 runs. Only a simple filtration is needed for the recycled use of the expensive noble metal catalysts. This versatile system is a good example of photochemical reactions occurring in the mesoporous silica molecular sieve. SBA-15 not only provides a support for the photosensitizer, but also acts as a nano-reactor to facilitate the photooxidation. 相似文献
115.
Zhao YP Zhao CC Wu LZ Zhang LP Tung CH Pan YJ 《The Journal of organic chemistry》2006,71(5):2143-2146
A simple, highly selective, neutral, fluorescent sensor for fluoride anions is reported. It is based on 2-ureido-4[1H]-pyrimidinone quadruple hydrogen-bonded AADD supramolecular assembly, and its assembling and disassembling processes are also able to respond to external stimuli reversibly. 相似文献