Cobalt(II) Schiff Base/Large Mesoporous Carbon Composite Film Modified Electrode as Electrochemical Biosensor for Hydrogen Peroxide and Glucose

A simple method was developed to prepare a cobalt(II) Schiff base (Co(salen))/large mesoporous carbon (LMC) composite film. The structure and electrocatalytic performance of the Co(salen)/LMC film were investigated by scanning electron microscopy (SEM) and cyclic voltammetry (CV). The Co(salen)/LMC film exhibits high electrocatalytic activity toward H₂O₂, such as low detection limit (8.5×10^?7 M) and wide linear concentration range (2.0×10^?6–8.9×10^?3 M). Furthermore, glucose oxidase (GOD) was self‐assembled on the surface of the Co(salen)/LMC film modified electrode. Determination of glucose in human blood serum with satisfying result was investigated by the resulting biosensor.     

Preparation and characterization of SO4 2−/Fe2O3–TiO2–Nd2O3 catalyst

This paper reports on the preparation of SO₄ ^2?/Fe₂O₃–TiO₂–Nd₂O₃ (SFTN) by combustion method. The effect of Nd content on catalytic activity was investigated. The prepared materials doped and undoped by Nd were compared by means of TG-DTG, XRD, FT-IR, NH₃-TPD and TEM techniques. Results indicated that the introduction of Nd improved the catalytic activities of the catalysts. Catalytic activity of SFTN was the highest with 98.3 % menthol conversion when Nd content was at 2 wt%. The introduction of Nd stabilized the coordination bond between the sulfate irons and the metallic oxides, helping in the formation of solid acid sites, enhancing the dispersion of catalyst particles, and inhibiting the growth of catalyst particles under heating.     

A DFT study on NLO response of push-pull hybrid porphyrin-polyoxometalate complexes

Density functional theory (DFT) calculations were carried out to investigate the second-order nonlinear optical (NLO) properties of a series of proposed porphyrin-polyoxometalate-based complexes related to [5-(3,5-dimethyl-4-hexamolybdate amino-phenyl-ethynyl)-15-(4-nitrophenyl-ethynyl)porphinato]zinc(II) which have donor-π conjugated bridge-acceptor (D-π-A) configurations. Our calculations show that these species possess considerably large molecular total second-order polarizability (β₀), ～2000 × 10^?30 esu. Furthermore, it can be seen that {W₆O₁₈} exhibits stronger electron-donating ability than {Mo₆O₁₈}. And two-dimensional (2D) system with A-π-D-π-A structure might be a promising candidate for NLO materials based on the large β₀ (4583.5 × 10^?30 esu) and in-plane nonlinear anisotropy.     

Bis-pyrene carbocations for chromogenic and fluorogenic dual-detection of fluoride anion in situ

We have designed and synthesized a new carbocation precursor (carbinol) based on bis-pyrene derivative. The carbinol can be transformed to stable carbocations with quenched fluorescence and long wavelength absorption. The stable carbocations can be further used as fluoride anion detection in acidic environment, which show both chromogenic and fluorogenic responses in the presence of fluoride anion. UV–vis and fluorescence spectroscopy were utilized to monitor the changes during detection process. The responsive mechanism was studied by quantum chemical calculations and the results indicate that the carbocation mediated formation of C–F covalent bond leads to this dual responsive phenomenon. The bis-pyrene carbocations and corresponding F adduct was confirmed MALDI-TOF mass spectrum. The successful elucidation of this new mechanism opens a new avenue for carbocation-based sensor or biological labeling in the future.     

以缺电子炔烃为原料经1,3-偶极环加成反应合成3-芳基中氮茚的新方法

报道了一种简便有效地合成3-芳基中氮茚的方法.反应需要的吡啶鎓盐可以用吡啶和苄卤很容易制得,然后以1,4-二氧六环为溶剂,在碳酸铯存在的条件下与缺电子炔烃经1,3-偶极环加成和芳构化反应即可得到3-芳基中氮茚,产率34%~81%.该方法具有原料易得、操作简便、反应条件温和、选择性好等优点.     

酸度调控的3,3-二乙硫基丙烯酸酯的吲哚化反应

探讨了酸度调控的3,3-二乙硫基丙烯酸酯的吲哚化反应,选择性地合成3,3-二吲哚基丙烯酸酯和3-吲哚基-3-氧代丙酸酯.研究表明,3,3-二乙硫基丙烯酸酯与吲哚反应时,在稀酸条件下,高产率生成3,3-二吲哚基丙烯酸酯,而在浓酸条件下,生成的3-吲哚基-3-乙硫基丙烯酸酯不稳定,在后处理和柱层析分离时易水解,高产率得到3-吲哚基-3-氧代丙酸酯.     

The dynamics of the stochastic multi-molecule biochemical reaction model

The paper introduces the dynamics of a stochastic multi-molecule biochemical reaction model.First, we show that there is a unique positive solution of the stochastic model. Furthermore, we deduce the conditions when the reaction will end and when the reaction being proceed. At last, we derive that the solution of (1.5) oscillates around the endemic proportion equilibrium $P^*(x^*,y^*)$ , and the intensity of fluctuation is proportional to white noise. The key to the analysis in this paper is choosing appropriate Lyapunov function. The outcomes are illustrated by computer simulations throughout this paper.     

三环己基锡取代间苯二甲酸酯的合成、表征及热稳定性分析

以三环己基氢氧化锡为原料,与取代的间苯二甲酸反应,得到了含有萘二甲酰亚胺结构的有机锡羧酸酯,化合物经元素分析、红外光谱及核磁共振波谱表征确认。晶体结构由X-射线单晶衍射法测定,它属于三斜晶系,空间群为P-1,晶胞参数:a=11.7829(7),b=12.9965(8),c=19.2944(12),α=92.6570(10)°,β=99.7970(10)°,γ=115.5100(10)°,V=2603.9(3)3,Z=2,Dc=1.397mg/m3,R1=0.0362,wR2=0.0761。热重分析表明化合物具有良好的热稳定性。     

Cohomology and Deformations of 3-Dimensional Heisenberg Hom-Lie Superalgebras

Czechoslovak Mathematical Journal - We study Hom-Lie superalgebras of Heisenberg type. For 3-dimensional Heisenberg Hom-Lie superalgebras we describe their Hom-Lie super structures, compute the...