Design and synthesis of ligustrazine derivatives as potential anti-Alzheimer's agents.

A novel series of ligustrazine derivatives was designed, synthesized, and evaluated as acetylcholinesterase (AChE) and butylcholinesterase (BuChE) inhibitors for the treatment of Alzheimer's disease (AD). studies displayed that some of the synthesized compounds revealed promising AChE and BuChE inhibitory effects. Particularly, compounds and , indicated highly AChE inhibitory activity with IC values of 1.

Chiral Cyclopropenimine-catalyzed Asymmetric Michael Addition of Bulky Glycine Imine to α,β-Unsaturated Isoxazoles.

A highly efficient asymmetric Michael addition of bulky glycine imine to α,β-unsaturated isoxazoles has been achieved by using 5 mol% of chiral cyclopropenimine as a chiral organo-superbase catalyst under mild conditions. Michael adducts were obtained in excellent yields (up to 97%) and stereoselectivities (up to >99 : 1 dr and 98% ee). A significant solvent effect was found in these chiral organosuperbase catalyzed asymmetric Michael reactions.

Capacity degradation of LiTiO during long-term cycling in terms of composition and structure.

Capacity fading of LiTiO (LTO) is inevitable during cycling; hence it is of great significance to clarify the factors causing the capacity degradation so as to take some measures to prolong the lifespan of LTO. Despite the investigation on the capacity fading mechanism within finite charge/discharge cycles, the fading mechanism during long-term cycling is still absent. Here, LTO half-cells underwent more than 700 lithiation/delithiation cycles at a current rate of 0.

Co-Modification of commercial TiO anode by combining a solid electrolyte with pitch-derived carbon to boost cyclability and rate capabilities.

The bad electrochemical performance circumscribes the application of commercial TiO (c-TiO) anodes in Li-ion batteries. Carbon coating could ameliorate the electronic conductivity of TiO, but the ionic conductivity is still inferior. Herein, a co-modification method was proposed by combining the solid electrolyte of lithium magnesium silicate (LMS) with pitch-derived carbon to concurrently meliorate the electronic and ionic conductivities of c-TiO.

A uniform few-layered carbon coating derived from self-assembled carboxylate monolayers capable of promoting the rate properties and durability of commercial TiO.

The poor cyclability and rate property of commercial TiO (c-TiO) hinder its utilization in lithium-ion batteries (LIBs). Coating carbon is one of the ways to ameliorate the electrochemical performance. However, how to effectively form a uniform thin carbon coating is still a challenge.

Facile Synthesis of Highly Graphitized Carbon via Reaction of CaC with Sulfur and Its Application for Lithium/Sodium-Ion Batteries.

In the present work, we report, for the first time, a novel one-step approach to prepare highly graphitized carbon (HGC) material by selectively etching calcium from calcium carbide (CaC) using a sulfur-based thermo-chemical etching technique. Comprehensive analysis using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and N adsorption-desorption isotherms reveals a highly graphitized mesoporous structure for the CaC-derived carbon with a specific surface area of 159.5 m g.

Combined Modification of Dual-Phase LiTiO-TiO by Lithium Zirconates to Optimize Rate Capabilities and Cyclability.

The low electrical conductivity and ordinary lithium-ion transfer capability of LiTiO restrict its application to some degree. In this work, dual-phase LiTiO-TiO (LTOT) was modified by composite zirconates of LiZrO, LiZrO (LZO) to boost the rate capabilities and cyclability. When the homogeneous mixture of LiNO, Zr(NO)·5HO and LTOT was roasted at 700 °C for 5 h, the obtained composite achieved a superior reversible capacity of 183.

Uniform Surface Modification of LiZnTiO by Liquated NaMoO To Boost Electrochemical Performance.

Poor ionic and electronic conductivities are the key issues to affect the electrochemical performance of LiZnTiO (LZTO). In view of the water solubility, low melting point, good electrical conductivity, and wettability to LZTO, NaMoO (NMO) was first selected to modify LZTO via simply mixing LZTO in NMO water solution followed by calcining the dried mixture at 750 °C for 5 h. The electrochemical performance of LZTO could be enhanced by adjusting the content of NMO, and the modified LZTO with 2 wt % NMO exhibited the most excellent rate capabilities (achieving lithiation capacities of 225.

Ionic Conductor of LiSiO as an Effective Dual-Functional Modifier To Optimize the Electrochemical Performance of LiTiO for High-Performance Li-Ion Batteries.

Ionic conductor of LiSiO (LSO) was used as an effective modifier to fabricate surface-modified LiTiO (LTO) via simply mixing followed by sintering at 750 °C in air. The electrochemical performance of LTO was enhanced by merely adjusting the mass ratio of LTO/LSO, and the LTO/LSO composite with 0.51 wt % LSO exhibited outstanding rate capabilities (achieving reversible capacities of 163.

Simple preparation of carbon nanofibers with graphene layers perpendicular to the length direction and the excellent li-ion storage performance.

Sulfur-containing carbon nanofibers with the graphene layers approximately vertical to the fiber axis were prepared by a simple reaction between thiophene and sulfur at 550 °C in stainless steel autoclaves without using any templates. The formation mechanism was discussed briefly, and the potential application as anode material for lithium-ion batteries was tentatively investigated. The carbon nanofibers exhibit a stable reversible capacity of 676.

Carbon-coated Fe-Mn-O composites as promising anode materials for lithium-ion batteries.

Fe-Mn-O composite oxides with various Fe/Mn molar ratios were prepared by a simple coprecipitation method followed by calcining at 600 °C, and carbon-coated oxides were obtained by pyrolyzing pyrrole at 550 °C. The cycling and rate performance of the oxides as anode materials are greatly associated with the Fe/Mn molar ratio. The carbon-coated oxides with a molar ratio of 2:1 exhibit a stable reversible capacity of 651.

Enhanced electrochemical performance of FeWO4 by coating nitrogen-doped carbon.

FeWO4 (FWO) nanocrystals were prepared at 180 °C by a simple hydrothermal method, and carbon-coated FWO (FWO/C) was obtained at 550 °C using pyrrole as a carbon source. The FWO/C obtained from the product hydrothermally treated for 5 h exhibits reversible capacities of 771.6, 743.

Property changes of powdery polyacrylonitrile synthesized by aqueous suspension polymerization during heat-treatment process under air atmosphere.

High molecular weight powdery polyacrylonitrile (PAN) polymers were prepared by aqueous suspension polymerization employing itaconic acid (IA) as comonomer and alpha,alpha(')-azobisisobutyronitrile (AIBN) as initiator at 60 degrees C. PAN polymers obtained with different monomer ratios were characterized by EA, DSC, FTIR and XRD. It is investigated that the oxygen element content in PAN polymers increased with the increase of required IA amounts in the feed and heat-treatment temperatures.

Low temperature induced synthesis of TiN nanocrystals.

TiN nanocrystals were successfully prepared through the direct reaction between TiCl(4) and NaNH(2) induced at 300 degrees C. The yield based on Ti is approximately 80%. X-ray powder diffraction indicated that the product was cubic TiN with a lattice constant of a = 4.