Publications by authors named "Asuka Konomi"
Article Synopsis
- Dimolybdenum complexes using a specific pincer ligand, designed through density functional theory (DFT) calculations, were developed to study the process of breaking down nitrogen bonds.
- These complexes efficiently catalyze the formation of ammonia from dinitrogen when paired with samarium diiodide as a reducing agent and water as a source of protons.
- The reactions occur successfully under normal ambient conditions, highlighting the effectiveness of the new dimolybdenum complexes in ammonia synthesis.
Article Synopsis
- - Researchers combined samarium(II) diiodide (SmI) with water to create a new method for selectively reducing organic and inorganic compounds, but the specific structure of the reactive Sm-water complex wasn't previously documented.
- - Using high-energy X-ray absorption spectroscopy, the study analyzed the Sm-water complex in a tetrahydrofuran (THF) and water mixture, revealing that adding at least eight equivalents of water leads to the breaking of Sm-I bonds.
- - The findings also included insights from UV/visible absorption spectra and simulations that explained how the addition of water affects electron transitions, helping to clarify how the Sm-water complex reacts and selects specific compounds for reduction.
The synthesis of ammonia from atmospheric dinitrogen, nitrogen fixation, is one of the essential reactions for human beings. Because the current industrial nitrogen fixation depends on dihydrogen produced from fossil fuels as raw material, the development of a nitrogen fixation reaction that relies on the energy provided by renewable energy, such as visible light, is an important research goal from the viewpoint of sustainable chemistry. Herein, we establish an iridium- and molybdenum-catalysed process for synthesizing ammonia from dinitrogen under ambient reaction conditions and visible light irradiation.
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- - A new set of cobalt(I)-dinitrogen complexes has been created using specific anionic 4-substituted benzene-based pincer ligands.
- - These complexes have been thoroughly characterized to understand their properties and effectiveness.
- - They act as highly efficient catalysts for producing silylamine from dinitrogen, achieving up to 371 equivalents of silylamine per cobalt atom under normal reaction conditions.
Molybdenum complexes bearing an anionic pyrrole-based PNP-type pincer ligand have been prepared and have been found to work as catalysts for the conversion of N2 into NH3 under ambient conditions.
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- - Researchers developed rhodium complexes using a specific type of pincer ligand, which is based on pyrrole and has an anionic charge.
- - These complexes are effective catalysts for turning molecular dinitrogen into tris(trimethylsilyl)amine, a useful chemical, under mild conditions.
- - This work marks the first successful instance of using rhodium catalysts for dinitrogen reduction while maintaining mild reaction conditions.
The relaxation dynamics of polyisoprene (PI) and nitrile butadiene rubber (NBR) chains at the SiO interface were directly probed as a function of distance from the SiO surface using time-resolved evanescent wave-induced fluorescence anisotropy, dielectric relaxation spectroscopy, and sum-frequency generation spectroscopy. We found the presence of the dynamics gradient of chains in the interfacial region with the SiO surface and tried to assign it to the two kinds of adsorbed chains, namely, loosely and strongly adsorbed, at the interface. The segmental relaxation of chains in the strongly adsorbed layer at the interface could be slower than that of bulk chains by more than 10 orders.
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