Electrochemical and chemical synthesis and structure of adducts (CH3OH and H2O) of metal chelates of N,N,O tridentate pyrazole-containing Schiff base

Chemical and electrochemical synthesis of a series of cobalt(II), nickel(II), copper(II), and zinc(II) complexes of tridentate Schiff base (H₂L), a product of condensation of N-(2-aminophenyl)-4-methylbenzenesulfonamide (2-tosylaminoaniline) with 1-phenyl-3-methyl-4-formylpyrazol-5-ol was accomplished. The structure and composition of metal-chelates were established by the C, H, N elemental analysis, IR, 1H NMR, EXAFS spectroscopy and magnetochemical data. The structures of all complexes were confirmed by of X-ray crystallography.     

Bis[2-(4′-Bromopyrazolyl-1′)-3-Tosylaminopyridinato]zinc(II): Synthesis,structure, and luminescence properties

2-(4′-Bromopyrazolyl-1′)-3-tosylaminopyridine (HL³) and its complex ZnL₂ (I) are synthesized, and their structures are studied by IR, UV, and ¹H NMR spectroscopy. The molecular structure of complex ZnL₂ is determined by X-ray diffraction analysis. The atomic structure of ZnL₂ is confirmed by the optimization of the molecular geometry using quantum-chemical calculations in the density functional theory approximation. The experimental bands in the absorption spectrum of complex I are interpreted on the basis of the calculations, and its photoluminescence properties are studied.     

VO2热致变色薄膜的结构和光电特性研究

用磁控溅射方法制备了VO₂热致变色薄膜.用X射线衍射、X射线光电子谱和原子力显微镜对薄膜的宏观及微观结构进行了分析，表明VO₂薄膜纯度高、相结构单一、结晶度好.薄膜的光透过率在2000nm处相变前后改变了42%，高/低温电阻率变化达到三个数量级以上.薄膜的光透过谱和相变过程中电学性质变化的研究与结构分析结果相一致. 关键词：     

分光光度法测定鱼翅中锗

本文用分光光度法测定鱼翅中的总锗量。结果表明 ,鱼翅中的总锗含量为 18.2 5— 2 2 .75 μg·g-1;回收率为 85 .8%— 93.2 %。     

THE DYNAMICS OF AN ANIMAL—VEGETATION SYSTEM: SHEEP FARMING

The paper studies the economy and ecology of sheep farming at the farm level in a Nordic context, with a crucial distinction between the outdoors grazing season and the winter indoors feeding season, and where climate conditions fix the length of the grazing season. Two different categories of animals, ewes (adult females) and lambs, and one plant species are included in our ecological model. The farmer is assumed to maximize present‐value profit where the revenue is made up income from meat and wool production. We find that livestock cycles may represent an optimal management policy. We also show that in a possible steady state with a constant number of animals and constant vegetation quantity, slaughtering either only lambs or only ewes is optimal.     

Zinc(II) and cadmium(II) <Emphasis Type="Italic">N</Emphasis>,<Emphasis Type="Italic">N</Emphasis>'-Bis(2-<Emphasis Type="Italic">N</Emphasis>-Tosylaminobenzylidene) diaminodipropyliminates: Syntheses,structures, and photoluminescence properties

Chemical and electrochemical syntheses of the zinc(II) and cadmium(II) complexes with the tetradentate Schiff base (H₂L), the condensation product of 2-N-tosylaminobenzaldehyde with diaminodipropylamine, are carried out. The structures, compositions, and properties of the synthesized metal complexes are studied by elemental analyses, IR spectroscopy, ¹H NMR, UV spectroscopy, X-ray absorption spectroscopy, and quantum-chemical calculations. The structure of the cadmium(II) complex is determined by X-ray diffraction analysis (CIF file CCDC no. 1446393). The cadmium(II) and zinc(II) complexes exhibit luminescence in a CH₂Cl₂ solution in the blue spectral range (λ_PL = 425–428 nm) with the photoluminescence quantum yields ? = 0.20 and 0.75, respectively.     

Synthesis and structure of 3-{[aryl (hetaryl)amino]methylene}chromane-2,4-diones and their metal complexes

3-{[Aryl(hetaryl)amino]methylene}chromane-2,4-diones (HL) were synthesized and used for chemical and electrochemical synthesis of Cu(II), Ni(II), and Co(II) complexes of the general formula ML2, as well as the ZnLOOCCH3 complex. The structure of the complexes was studied by IR, ¹Н NMR, and X-ray absorption spectroscopy. Density functional theory (DFT) calculations showed that the energetically most favored form of compounds HL is an aminoketone tautomeric form. The crystal structure of the solvate of bis-{3-[(4-methylanilinato)methylene]chromane-2,4-dionato}copper(II) with two DMF molecules was determined by X-ray diffraction analysis.     

利用一个通用的方法全合成Fuscinarin和Fuscins

通过一个共同的中间体6,首次全合成了fuscinarin (1)和全合成了fuscins,它们都是戊烯酮(pentaketide)的代谢物,在亲近闪烁检测(scintillation proximity assay)中显示具有抗CCR5的活性。这一合成主要是利用微波辅助的 ortho-Claisen/Cope 重排的串联反应更合成中间体10。     

Coordination motifs in modern supramolecular chemistry

In this paper we describe the contribution of coordination chemistry to the creation and development of supramolecular chemistry. Both discrete- and infinite buildups are examined. The first group comprises metal-containing host molecules and organic acceptors for metal cations; the second includes coordination polymers, ionic -and liquid crystals. Their potential- and practical applications are briefly explained.