核磁共振波谱检测具有方便、简单、快速、环境友好等优点,随着小型化、微型化核磁共振的发展和普及,基于NMR 方法的手性识别及ee 值的测定越来越受到化学家的青睐[1],NMR主要借助于化学位移、耦合常数、弛豫时间、NOE、扩散系数等参数来研究手性识别,它能够观测到手性分子中每一个功能基团在手性识别过程中的表现,能清晰地表明主客体相互作用的位点,并且可以预测非对映体络合物的空间构象。
Purple sweet potato not only has the nutritional components of ordinary sweet potatoes,but also contains polysaccharides and flavonoids.
Preparating the superfine powder of cordyceps militaris[1];contentting determination of adenosine,cordycepin and polysaccharide[2].Us-ing the method of HPLC[3] influence the superfine powder of cordyc
The series of mesoporious Al-KIT-1(x)with different Al amounts were successfully prepared by post-synthesis grafting method using aluminium iso-propoxid as the Al source and the pure silicon mesoporou
KIT-TMS,the silylating mesoporous molecular sieve was prepared from a pure silica KIT-1 with trimethylchlorosilane at 30℃ for 8h,and characterized by FT-IR,MAS NMR,XRD and nitrogen adsorption-desorpti
染料敏化太阳能电池(DSSCs)以生产工艺简单、制备成本低廉以及使用寿命长等优点而备受关注.截至目前为止，该类电池应用的最大障碍仍是其光电转换效率过低.DSSCs 的主要组件包括染料敏化剂、对电极、电解质和半导体四部分.其中，染料分子吸收太阳光、跃迁至激发态、产生注入电子，半导体接受电子并将其传输至外电路.
In absence of complex environment,photoelectron spectroscopy is a very sensitive probe of the evolving electronic structure along a reaction coordinate,e.g.in the investigation of photophysical and ph
LiFePO4 suffers from a lower energy density,and LiMnPO4 suffers from poor electronic and ionic conductivity.Iron-substituted LiMnPO4(LiMnxFe1-xPO4)composites can complement each others shortcomings an
In this paper,SrTiO3/TiO2 composites were synthesized by sol-gel method,and the effects of different contents of SrTiO3/TiO2 on their photoelectrocatalytic properties were studied.
近年来，由于化石燃料的燃烧导致环境问题越发严重。因此，探究新的储能设备具有重要的研究意义。目前，锂离子电池具有工作电压高，循环寿命长和比能量高等优势广泛应用在电子和混合电力设备等。金属氧(硫)化物具有高的理论比容量和储量丰富等优势广泛应用于锂离子电池的负极材料。