排序方式: 共有4条查询结果,搜索用时 15 毫秒
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Hyeona Kang Prof. Dr. Jaeheung Cho Dr. Kyung‐Bin Cho Takashi Nomura Prof. Dr. Takashi Ogura Prof. Dr. Wonwoo Nam 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(42):14119-14125
Mononuclear MnIII–peroxo and dinuclear bis(μ‐oxo)MnIII2 complexes that bear a common macrocyclic ligand were synthesized by controlling the concentration of the starting MnII complex in the reaction of H2O2 (i.e., a MnIII–peroxo complex at a low concentration (≤1 mM ) and a bis(μ‐oxo)MnIII2 complex at a high concentration (≥30 mM )). These intermediates were successfully characterized by various physicochemical methods such as UV–visible spectroscopy, ESI‐MS, resonance Raman, and X‐ray analysis. The structural and spectroscopic characterization combined with density functional theory (DFT) calculations demonstrated unambiguously that the peroxo ligand is bound in a side‐on fashion in the MnIII–peroxo complex and the Mn2O2 diamond core is in the bis(μ‐oxo)MnIII2 complex. The reactivity of these intermediates was investigated in electrophilic and nucleophilic reactions, in which only the MnIII–peroxo complex showed a nucleophilic reactivity in the deformylation of aldehydes. 相似文献
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Shin Yeon-Kyung Kim Min-Cheol Moon Sang-Hyun Kim Eun-Soo Lee Ji-Eun Choi Sojeong Kim Hyeona Park Kyung-Won 《Journal of Solid State Electrochemistry》2019,23(2):475-484
Journal of Solid State Electrochemistry - Since Li+ ions can transport through porous channels in the separator containing liquid electrolyte, the electrochemical and structural properties of the... 相似文献
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Hyeona Kim Daaye Kim Young-Kwon Park Jong-Ki Jeon 《Research on Chemical Intermediates》2018,44(6):3823-3833
In this study, the oligomerization of a butene mixture composed of 1-butene, cis-2-butene and trans-2-butene over several types of zeolites in a fixed-bed catalytic reactor at an elevated pressure was studied to produce hydrocarbons in the jet fuel range (C8–C16). Three types of zeolites, HZSM-5, Hβ and HY, were compared to evaluate the performance during the synthesis of jet fuel via the oligomerization of the aforementioned butene mixture. Compared to HY and Hβ, HZSM-5 showed a very stable butene conversion rate with high selectivity to jet-fuel-range hydrocarbon, which could be attributed to high resistance to coke resulting from the pore structure. HZSM-5 (50) shows the best quantitative conversion performance and yield for jet fuel for a time-on-stream of up to 6 h. It was also noted that the branched-to-linear hydrocarbon ratio reached 8.7 over the HZSM-5 (50) catalyst, which is beneficial to improve the cold properties of jet fuel. The present study reveals that HZSM-5 (50) is a potential catalyst for jet fuel synthesis through the oligomerization of butene mixture, exhibiting high stability and a high yield. 相似文献
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Hyunmin Jeong Soojoon Lee Yonghae Lee Hyeona Lim 《International Journal of Theoretical Physics》2014,53(3):807-814
We consider the Peres-Wootters measurement for three nonorthogonal states, |0〉, cosθ|0〉+sinθ|1〉, and cosθ|0〉?sinθ|1〉 (0<θ<π/2). We calculate probabilities to obtain the correct outcomes by the method and compare them to probabilities by the general orthogonal measurements. We show that θ=π/3 if and only if the Peres-Wootters measurement is optimal. We also present numerically that the optimal orthogonal measurement is better than the Peres-Wootters measurement for several cases when θ≠π/3. 相似文献
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