Publications by authors named "D Hashizume"
Amide hydrogenation is an important process for producing amines, with the development of efficient heterogeneous catalysts relying on the creation of bimetallic active sites where the two components interact synergistically. In this study, we develop a method for preparing catalysts using ligand-functionalized organometallic polyoxometalates by synthesizing a Rh-Mo organometallic polyoxometalate, [(RhCp)MoO] (Cp = C(CH)(COOCH)), with Rh-O-Mo interfacial structures and ethoxycarbonyl-functionalized ligands as a catalyst precursor. The activity of supported Rh-Mo catalysts for amide hydrogenation depend on the precursor used, with [(RhCp)MoO] showing the highest activity, followed by [(RhCp*)MoO] (Cp* = C(CH)), and then RhCl combined with (NH)[MoO]·4HO.
View Article and Find Full Text PDFElectrocatalysts which can operate for several years are required to produce hydrogen and commodity chemicals in an environmentally friendly manner. However, designing materials with long operational lifetimes is challenging, due to the lack of a conceptual framework to predict catalytic lifetimes quantitatively. Here, we report a microkinetic equation which quantifies the lifetime of an electrocatalyst undergoing dissolution.
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- Cells extract energy using ionic gradients and this principle is now applied in generating osmotic power from salinity gradients found at ocean-river interfaces.
- The research shows that natural hydrothermal vent precipitates can convert ionic gradients into electrochemical energy by selectively transporting ions like Na, K, H, and Cl, thanks to their special nanoscale structure.
- The study highlights that confined nanopores in mineral structures change their surface charge based on ion adsorption, enabling these minerals to act as both cation and anion selective membranes, which allows for the generation of osmotic energy from geologic flow and concentration gradients.
Article Synopsis
- The study visualizes the electron-density distribution in the 1,2-digermacyclobutadiene ring, highlighting its unique electron behavior.
- The GeC ring exhibits a strong Möbius 4π-electron aromatic character, which is distinct from the antiaromatic nature of the all-carbon cyclobutadiene.
- This research suggests that the presence of germanium alters the electronic properties significantly compared to the carbon-only structure.
Article Synopsis
- A new compound called bromocyclotrisilene has been synthesized, known for its strong air stability and unique structure, through reactions involving 1,2-dibromodisilene.
- The compound features a slightly bent planar structure and retains a reactive Si-Br bond, particularly under reducing conditions.
- Further reactions with lithium metal result in the creation of stable silicon homologues of cyclopropyl radicals, demonstrating intriguing properties of three-membered silicon rings in organic chemistry.