High-Pressure Electrical Transport Behavior in WO₃

Abstract

The high-pressure electrical transport behavior of microcrystalline tungsten trioxides (WO3) was investigated by direct current electrical resistivity measurement and alternate current impedance spectrum techniques in a diamond anvil cell up to 35.5 GPa. Discontinuous changes of electrical resistivity occurred during the pressure induced structure phase transitions at 1.8, 21.2, and 30.4 GPa. The irreversible resistivity reveals that the structure phase transition is not reversible. In addition, the abnormal changes of bulk resistance and transport activation energy at about 3 and 10 GPa are related to the isostructural phase transition reported by previous Raman study. The temperature induced resistivity change indicates that WO3 is a semiconductor from ambient pressure to 25.3 GPa.

Chiral Amines from Transition‐Metal‐Mediated Hydrogenation and Transfer Hydrogenation

“…Thus far, this ligand has been supported on dendrimers [181,182], polystyrenes [183], silica gel [184], mesoporous siliceous foam [185], and mesoporous siliceous foam modified with magnetic particles [186]. The resulting modified ligands have been used in combination with ruthenium, rhodium, and iridium to catalyze the asymmetric transfer of imines and, more commonly, ketones.…”

“…They also performed a control experiment in which they used a physical mixture of siliceous mesoporous foam, [RuCl 2 (p-cymene)] 2 , and 26 as the catalyst; this catalyst was active and selective in the first transfer hydrogenation run, but could not be reused. Li Huang and Yings approach by grafting magnetic c-Fe 2 O 3 onto spherical siliceous mesoporous foam particles before attaching the ligand [186]. This design feature was intended to make the catalyst magnetic and therefore easier to recover.…”

Interference by metabolites and the corresponding troubleshooting during the LC–MS/MS bioanalysis of G004, a bromine-containing hypoglycemic agent

“…The pharmacological study favors G004 as a promising novel hypoglycemic agent. It aims at reducing vascular complications as well as controlling glucose excursion for type II diabetes [9][10][11][12][13][14].…”

Immobilization of a Modified Tethered Rhodium(III)‐p‐Toluenesulfonyl‐1,2‐diphenylethylenediamine Catalyst on Soluble and Solid Polymeric Supports and Successful Application to Asymmetric Transfer Hydrogenation of Ketones

“…[23] Although first recycling results were poor, this approach was successfully followed by other groups. [24][25][26] Solid organic and inorganic supports, to which TsDPEN or derivatives were covalently bound, have also widely been used, [27][28][29][30][31][32] and some attempts have been made to use soluble supported [33,34] as well as micellar-embedded TsDPEN-based catalysts. [35,36] Here we report the modification and covalent binding of a tethered RhA C H T U N G T R E N N U N G (III)-TsDPEN complex to both soluble hyperbranched polymers and solid polymeric chips as supports.…”