chemistry

摘要： A surge of interest has been brought to all-solid-state batteries(ASSBs)as they show great prospects for enabling higher energy density and improved safety compared to conventional liquid batteries.Na Super Ionic CONductors(NaSICONs)proposed by Goodenough and Hong in 1976 are the most promising materials class for Nabased ASSBs owing to their excellent ion conductivity(>1mS cm−1),high thermal and chemical/electrochemical stability,as well as good chemical/electrochemical compatibility with electrode materials.The major challenge facing NaSICONtype electrolytes is the generally high interfacial resistance and thus sluggish charge transfer kinetics across the NaSICON/cathode interface.Great endeavors in the past few years have led to progress in the improvement of the ion-conducting property,and a dramatic decrease in the NaSICON/electrode interface resistance.Excellent cycling performance and rate capability have been achieved through interface engineering.In this review article,we summarize the state-of-theart findings for various derivatives of NaSICON structured solid electrolytes,with the aim of providing a deeper understanding of the underlying mechanism for the improvement of ion conductivity,and the intrinsic reasons for the enhanced interface charge transfer kinetics.These strategies can be readily extended to other solid electrolytes.We hope this review will inspire more work on NaSICONtype solid electrolytes and solid-state batteries.

摘要： 1.Requirement for Articles The journal mainhy publishee original rsearch papers.research notes.ltter and reports about Weather 8nd elimate analysis,agri-eulture and eeology meteorelogy.pollution meteorology.stmospharie physies and atmespharis chemistry.witer fasourees and en-vironment.soil enviroement.disaster prevention and Fnduetion。and ether relatad tields These artidles ean felar to basie theery.a.plled research and high tech,ote.A manuscript must offer ditilld document and ellable dnta.The Innovative ldaa should be da-soribed concisaly and darfinitoly.

摘要： Iron formations are valuable archives of sedimentary conditions and post-depositional events.However,geochemical proxies commonly used to determine genetic characteristics can be variably modified during metamorphism and deformation,hampering their use as records of regional geological events.This work focuses on strongly reworked magnetite-quartz-rich rocks from the São Josédo Campestre Massif,one of the oldest fragments of preserved crust in South America.The genetic classification of these magnetite-quartz-rich rocks is not straightforward because primary assemblages and textures were variably modified by granulite facies metamorphism during a regional Paleoproterozoic migmatization event.To address genetic ambiguities,we analyzed their magnetite and pyroxene chemistry,wholerock geochemistry,and Sm-Nd isotopes.Magnetite chemistry indicates that pyroxene-poor iron formations(Type B)are low in trace elements such as Ti,Al,V,and Mn,suggesting a chemical similarity to iron formations elsewhere.In contrast,magnetites from pyroxene-enriched Type A iron formations are rich in trace elements and more akin to magnetite crystallized from higher temperature systems,such as skarn and IOCG.The^(147)Sm/^(144)Nd of these rocks show substantial variation even at the outcrop scale,indicating a locally-controlled,highly heterogeneous mixture of Archean,Paleoproterozoic,and Neoproterozoic sources.Therefore,our geochemical tools point out to heterogenous signatures of these magnetitequartz rocks and proxies compatible with both low and high-temperature conditions and age of deposition spanning sources from the Archean to the Neoproterozoic.We interpret that the studied São Josédo Campestre magnetite-quartz rocks represent Archean iron formations with original magnetite chemistry and isotopic signatures variably modified by metamorphism and by at least one deformation-related hydrothermal event.These results contrast with similar examples from China and Greenland where iron formations either preserved the magnetite chemistry or the primary isotopic signatures.Our study indicates that metamorphism can selectively affect chemical proxies used to study iron formations and undermine the genetic classification of iron ores.Thus,these proxies should be carefully applied in the interpretation of syn-depositional environments of polydeformed belts.

摘要： Professor Xiuwen Han is the founder and pioneer of Nuclear Magnetic Resonance(NMR)spectroscopy in Dalian Institute of Chemical Physics,the Chinese Academy of Sciences(DICP,CAS).She has long consistently been engaged in the field of NMR spectroscopy,structural chemistry,and catalytic chemistry,and has made fruitful achievements in the structural analysis of organic compounds,natural products,biomolecules,homogeneous and heterogeneous catalysts.

摘要： Chemical fertilizer industry is of great importance to agricultural developments.Urea(CO(NH2)2),which was firstly discovered by Hilaire Rouelle in 1773,is the most widely used chemical fertilizers in the world[1].Up to now,urea still represents the solid nitrogen fertilizer with the highest nitrogen content.The synthesis of urea is therefore closely related to the fertilizer production and very important in the synthetic chemistry.The modern ammonia synthesis industry has laid a foundation for the large-scale artificial synthesis of urea.However,in this route,urea is typically synthesized from the Ostwald post-process of ammonia.

摘要： ABOUT THIS JOURNAL Launched in 1988,the Chinese Journal of Chemical Physics(CJCP)is devoted to reporting new and original experimental and theoretical research on interdisciplinary careas,with chemistry and physics groundwork of interest to researchers,faculty and students domestic and abroad in the fields of chemistry,physics,material and biological sciences and their interdisciplinary areas.

摘要： An efficient method for the conjugate addition of indoles to a variety of chalcones using BiBr3 in ethanol (190 proof) is reported. Products are isolated by a simple procedure that avoids an aqueous work up and extensive chromatography, thus minimizing waste. Bismuth (III) compounds are especially attractive from a green chemistry perspective because they are remarkably nontoxic, non-corrosive and relatively inexpensive.

摘要： This study involved the assessment of the MNI2SX/Def2TZVP/H2O model chemistry to enhance the understanding of the structural composition of the marine peptide Hemiasterlin and its derivatives A and B used in cancer treatment. The Conceptual Density Functional theory was used in the calculation of molecular properties of the system chemical descriptors during the study. Integration of the active molecular regions into their respective Fukui functions was used in the selection of electrophilic and nucleophilic attacks. Additionally, the proposed correlation between global hardness and the pKa was used as the basis of deriving accurate predictions for the pKa values while a homology technique was used in the prediction of bioactivity and bioavailability scores of the peptides under investigation.

摘要： 本发明涉及环糊精键合固定相的制备，具体的说是一种采用clickchemistry反应制备键合型环糊精固定相的方法，该制备方法包括两个步骤：首先通过硅烷偶联剂在硅胶表面引入叠氮基或者炔基制备叠氮基硅胶衍生物或炔基硅胶衍生物，然后通过叠氮基与炔基的1，3－环加成反应，即click chemistry，在水溶液中20～80°C的条件下反应24～72小时，将修饰了炔基或叠氮基的环糊精键合到硅胶表面。本发明所提供的键合反应选择性高，能很好的保持环糊精的结构，制备方法简便，适用范围广，所制备的环糊精键合固定相表面键合量较高，适合用作高效液相色谱分离材料，特别适用于在亲水液相色谱模式下分离强极性化合物。