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排序方式: 共有623条查询结果,搜索用时 62 毫秒
621.
Dr. Denis Leshchev Dr. Andrew J. S. Valentine Dr. Pyosang Kim Dr. Alexis W. Mills Dr. Subhangi Roy Dr. Arnab Chakraborty Dr. Elisa Biasin Prof. Kristoffer Haldrup Dr. Darren J. Hsu Dr. Matthew S. Kirschner Dr. Dolev Rimmerman Dr. Matthieu Chollet Dr. J. Michael Glownia Dr. Tim B. van Driel Prof. Felix N. Castellano Prof. Xiaosong Li Prof. Lin X. Chen 《Angewandte Chemie (International ed. in English)》2023,62(28):e202304615
Photoexcited molecular trajectories on potential energy surfaces (PESs) prior to thermalization are intimately connected to the photochemical reaction outcome. The excited-state trajectories of a diplatinum complex featuring photo-activated metal–metal σ-bond formation and associated Pt−Pt stretching motions were detected in real time using femtosecond wide-angle X-ray solution scattering. The observed motions correspond well with coherent vibrational wavepacket motions detected by femtosecond optical transient absorption. Two key coordinates for intersystem crossing have been identified, the Pt−Pt bond length and the orientation of the ligands coordinated with the platinum centers, along which the excited-state trajectories can be projected onto the calculated PESs of the excited states. This investigation has gleaned novel insight into electronic transitions occurring on the time scales of vibrational motions measured in real time, revealing ultrafast nonadiabatic or non-equilibrium processes along excited-state trajectories involving multiple excited-state PESs. 相似文献
622.
Organic Excitonic State Management by Surface Metallic Coupling of Inorganic Lanthanide Nanocrystals
Wenxing Zhang Shan Wang Wenpeng Ye Yiyuan Zhu Cheng-Ao Li He Wang Chaomin Dong Dr. Huili Ma Prof. Mi Yan Prof. Zhongfu An Prof. Wei Huang Prof. Renren Deng 《Angewandte Chemie (International ed. in English)》2023,62(52):e202312151
The ability to harness charges and spins for control of organic excitonic states is critical in developing high-performance organic luminophores and optoelectronic devices. Here we report a facile strategy to efficiently manipulate the electronic energy states of various organic phosphors by coupling them with inorganic lanthanide nanocrystals. We show that the metallic atoms exposed on the nanocrystal surface can introduce strong coupling effects to 9-(4-ethoxy-6-phenyl-1,3,5-triazin-2-yl)-9H-carbazole (OCzT) and some organic chromophores with carbazole functional groups when the organics are approaching the nanocrystals. This unconventional organic–inorganic hybridization enables a nearly 100 % conversion of the singlet excitation to fast charge transfer luminescence that does not exist in pristine organics, which broadens the utility of organic phosphors in hybrid systems. 相似文献
623.
Prof. Dr. Shi-Chao Qi Yong-Lan Liu Xiao-Jie Lu Yun-Jie Zhao Jia-Xin Li Prof. Dr. Xiao-Qin Liu Prof. Dr. Lin-Bing Sun 《Angewandte Chemie (International ed. in English)》2023,62(27):e202304367
The photo-responsive adsorption has emerged as a vibrant area, but its current methodology is limited by the well-defined photochromic units and their molecular deformation driven by photo-stimuli. Herein, a methodology of nondeforming photo-responsiveness is successfully exploited. With the exploiting agent of Cu-TCPP framework assembled on the graphite and strongly interacted with it, the sorbent generates two kinds of adsorption sites, over which the electron density distribution of the graphite layer can be modulated at the c-axis direction, which can further evolve due to photo-stimulated excited states. The excited states are stable enough to meet the timescale of microscopic adsorption equilibrium. Independent of the ultra-low specific surface area of the sorbent (20 m2 g−1), the CO adsorption capability can be improved from 0.50 mmol g−1 at the ground state to 1.24 mmol g−1 (0 °C, 1 bar) with the visible light radiation, rather than the photothermal desorption. 相似文献