A Novel 3D Na(I) Coordination Polymer Constructed by 3,5-Bis(4'-Carboxy-Phenyl)-1,2,4-Triazole: Synthesis,Crystal Structure,and Photocatalytic Property

Crystallography Reports - A novel 3D metal coordination polymer, {[Na4(µ2-H2O)(DMF)2(BCT)2]?DMF}n (I) (DMF = N,N-dimethylformamide, H2BCT =...     

Synthesis,Crystal Structure,and Biological Activity of Two Complexes based on 5-hydroxy-4′-methoxyisoflavone-3′-sulfonate

Russian Journal of Coordination Chemistry - Two metal complexes [Mn(H2O)6(C16H11O7S)2] · 2H2O (I) and Al(H2O)3(C16H11O7S) · 2H2O (II) were synthesized by reaction of the sodium...     

Systematic investigation of sequence and structural motifs that recognize ATP

Interaction between ATP, a multifunctional and ubiquitous nucleotide, and proteins initializes phosphorylation, polypeptide synthesis and ATP hydrolysis which supplies energy for metabolism. However, current knowledge concerning the mechanisms through which ATP is recognized by proteins is incomplete, scattered, and inaccurate. We systemically investigate sequence and structural motifs of proteins that recognize ATP. We identified three novel motifs and refined the known p-loop and class II aminoacyl-tRNA synthetase motifs. The five motifs define five distinct ATP–protein interaction modes which concern over 5% of known protein structures. We demonstrate that although these motifs share a common GXG tripeptide they recognize ATP through different functional groups. The p-loop motif recognizes ATP through phosphates, class II aminoacyl-tRNA synthetase motif targets adenosine and the other three motifs recognize both phosphates and adenosine. We show that some motifs are shared by different enzyme types. Statistical tests demonstrate that the five sequence motifs are significantly associated with the nucleotide binding proteins. Large-scale test on PDB reveals that about 98% of proteins that include one of the structural motifs are confirmed to bind ATP.     

Research progress on electrolytes for fast-charging lithium-ion batteries

Fast-charging is considered to be a key factor in the successful expansion and use of electric vehicles.Current lithium-ion batteries(LIBs) exhibit high energy density, enabling them to be used in electric vehicles(EVs) over long distances, but they take too long to charge. In addition to modifying the electrode and battery structure, the composition of the electrolyte also affects the fast-charging capability of LIBs. This review provides a comprehensive and in-depth overview of the research pr...     

A Chinese Lantern-like 2D Cu(Ⅱ) Coordination Polymer Constructed by Bis-imidazole and Dicarboxylate Co-ligands: Synthesis,Crystal Structure and Photocatalytic Activity

A new Cu(II) coordination polymer, {[Cu(1,3-BIP)(TFBDC)]·DMF}n(1,1,3-BIP is a 1,3-bis(imidazole)propane, and H2TFBDC is 2,3,5,6-tetrafluoroterephthalic acid) was prepared under solvothermal conditions and characterized by single-crystal and powder X-ray diffraction, IR spectra, thermogravimetric analyses and elemental analyses. The single-crystal X-ray diffraction reveals that metal coordination polymer 1(MCP 1) shows a two-dimensional sheet layer structure, which is further reinforced through strong intermolecular hydrogen bonding to form a 3 D supramolecular framework. Furthermore, the photocatalytic experiment result indicates the degradation ratios of methyl orange(MO) reach 83.4% within 180 minutes when MCP 1 acts as catalyst.     

关于N（2，2，0）代数的中间幂等元

为了深入研究N（2,2,0）代数的代数结构,在N（2,2,0）代数中建立了中间幂等元的概念,讨论了它的基本性质,给出了中间幂等元关联的集合坞是（S,＊,△,0）的子代数的一个条件．证明了当U（2,2,0）代数中包含一个右零半群时,Mg是幂等元集E（S）的子集．并利用坞定义了一个等价关系．     

Fe离子注入ZnO生成超顺磁纳米颗粒

过渡族元素掺杂ZnO生成稀磁半导体, 成为近期国际材料科学研究的热点. 在本文中, 研究Fe离子注入ZnO单晶的结构和磁性变化, 目标是建立磁性和结构的对应关系, 澄清铁磁性的来源. 采用卢瑟福背散射/沟道技术 (RBS/Channelling)、同步辐射X射线衍射 (SR-XRD)和超导量子干涉仪 (SQUID), 研究注入温度和退火对样品的晶格损伤、结构及磁性的影响. 研究表明: 样品注入区损伤随注入温度升高而降低; 低温253 K注入样品中, SR-XRD未检测到新相, Fe离子分布于Zn位, ZnO (0002) 峰右侧肩峰可能属于Zn_1-xFe_xO, 5 K下测试样品不具有铁磁性; 623 K注入和823 K真空退火 (253 K注入) 样品中形成α和γ相金属Fe, 5 K下样品具有明显的剩磁和矫顽力, 零场冷却和场冷却 (ZFC/FC) 曲线和300 K下的磁滞回线显示纳米Fe颗粒具有超顺磁性. Fe离子注入ZnO的磁性源于第二相α-Fe和γ-Fe. 关键词： 离子注入 ZnO 同步辐射X射线衍射 超顺磁性     

Biomimetic transformation of gentiopicroside to erythrocentaurin

Biomimetic transformation of gentiopicroside was carried out byβ-glucosidase at pH 7.0 for 3 days at 37℃.Two products, etythrocentaurin and 5,6-dihydro-5-formyl-6-methyl-1H,3H-pyrano[3,4-c]pyran-1-one were isolated and identified by ~1H NMR, ~(13)C NMR,UV,IR,MS and elemental analyse.The possible mechanisms were discussed.