Chiral cyanide-bridged 1D Fe~Ⅲ-Mn~Ⅲ heterobimetallic chains: Synthesis, structures and magnetic properties

Two couples of enantiomerically pure chiral cyano-bridged heterobimetallic one-dimensional (1D) chain complexes: [Mn((R,R)-Salphen)Fe(Tp)(CN)3]n (1) and [Mn((S,S)-Salphen)Te(Tp)(CN)3]n (2) (Salphen = N,N’-1,2-diphenylethylenebis (salicylideneiminato) dianion, Tp = tris(pyrazolyl) hydroborate), [Mn((R,R)-Salphen)Fe(Tp*)(CN)3·2H2O]n (3) and [Mn((S,S)-Salphen)Fe(Tp*)(CN)3·2H2O]n (4) (Tp* = hydridotris (3,5-dimethylpyrazol-1-yl) borate), have been successfully synthesized by the reactions of MnIII schiff-base complexes with the tricyanometalate building block, [(LTp)Fe(CN)3]- (LTp = Tp or Tp*). All complexes are made up of neutral cyano-bridged zigzag double chains with (-Fe-C≡N-Mn-N≡C-)n as the repeating unit. Circular dichroism (CD) spectra confirm the enantiomeric nature of the optically active complexes. Magnetic studies demonstrate that ferromagnetic interactions are operative in these complexes. The ferromagnetic couplings become weak in the chains with the bending of the Mn-N≡C angles.     

Synthesis of aminoalkylsilanes with oligo(ethylene oxide) unit as multifunctional electrolyte additives for lithium-ion batteries

Aminoalkylsilanes with oligo(ethylene oxide) units were designed and synthesized as multifunctional electrolyte additives for lithium-ion batteries. The chemical structures were fully characterized by nuclear magnetic resonance (NMR) spectroscopy and their thermal properties, viscosities, electrochemical windows, and ionic conductivities were systematically measured. With adding one of these compounds (1 vol. %, DSC3N1) in the baseline electrolyte 1.0 M LiPF₆ in EC: DEC (1:1, in volume), Li/LiCoO₂ half cell tests showed an improved cyclability after 100 cycles and improved rate capability at 5C rate condition. Electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopic (EDS) analysis confirmed the acid scavenging function and film forming capability of DSC3N1. These results demonstrated that the multifunctional organosilicon compounds have considerable potential as additives for use in lithium-ion batteries.     

基于双抗体夹心传感膜的信号增强方法用于致癌基因c—myc蛋白的检测

采用层层自组装方法,制备了一种基于双抗体夹心层修饰金电极的信号增强电化学生物传感器,即先通过组装L-半胱氨酸、戊二醛,固定c—Myc（9E10）单克隆抗体（C．AbI）,形成C．Ab1单抗修饰电极,可识别致癌基因c—myc蛋白;再结合上第二抗体羊抗鼠免疫球蛋白G抗体（c．Ab2）,形成C．Ab1／c—myc／C—Ab2双抗夹心修饰电极,响应信号大幅度增强,传感性能优于C—A1单抗修饰电极．通过电化学阻抗和循环伏安行为探讨了双抗夹心法信号增强的机理,其阻抗值与c．myc浓度对数在0．043-430nM范围内成良好的线性关系,线性方程可拟合为Y=10046．10＋863．33墨线性相关系数为0．9904,c—myc的最低检测限也降低至25．76pM．该传感器制备简单,选择性、重现性、稳定性和再生性好,在鼠血清样品中测得c—myc的回收率在97．4％-103．7％之间,表明该方法可用于实际肿瘤样品中c—myc的检测,在生物医学领域具有潜在的应用价值．     

Self-intersection local times and collision local times of bifractional Brownian motions

In this paper, we consider the local time and the self-intersection local time for a bifractional Brownian motion, and the collision local time for two independent bifractional Brownian motions. We mainly prove the existence and smoothness of the self-intersection local time and the collision local time, through the strong local nondeterminism of bifractional Brownian motion, L2 convergence and Chaos expansion.     

Design and fabrication of compact 3-dB coupler in silicon-on-insulator

A novel compact 3-dB coupler is proposed and fabricated in silicon-on-insulator. The new coupler provides large output waveguide spacing of 125.0 μm with short device length of 867.0 μm and large cross-section of 6.0 × 4.0 μm. The device length can be remained essentially unchanged even when the output spacing is further enlarged to realize the complex applications in photonic integrated circuits. The fabricated device exhibits excess loss of 6.3 dB and low imbalance of 0.26 dB.     

MgH_2储氢热力学研究进展

近年来,材料和能源领域中高能量密度车载储氢材料的研究和开发吸引了世界各国科技工作者的广泛兴趣.MgH2作为一种相对廉价的固体储氢材料,其理论储氢量高达7.6 wt%,且循环吸放氢性能较好,业已成为储氢材料领域的研究热点.本文着重从热力学的角度,对MgH2储氢材料的近期研究进展,特别是其储氢热力学性能的改进,包括纳米化、复合、催化、限域以及理论计算等方面进行简要综述,旨在明确当今MgH2作为潜在可应用储氢材料的研究重点和未来发展趋势.     

<Emphasis Type="Italic">Ab initio</Emphasis> study of a Y-doped ∑31 grain boundary in alumina

The atomic structures and energetics of clean and Y-doped general grain boundary (GB) ∑31/(0001) models in α-Al₂O₃ are studied by a series of high precision ab initio calculations. A large supercell with 700 atoms and periodic boundary conditions is adopted for undoped and Y-doped GB with different substitution sites and concentrations. It is shown that Y atoms preferably segregate to the central column of the 7-member Al ring. This is explained as more favorable bond formation for Y in this position and lower GB energy. The calculated GB formation energy for the clean and Y-doped cases is respectively 3.99 and 3.67 J/m². On the average, the GB region in ∑31 has a slightly lower charge density than the bulk crystalline region. In addtition, the GB induces a long ranged asymmetric electrostatic potential distribution on each side of the grain boundary.     

Fluorescence detection techniques for protein kinase assay

Traditional methods for protein kinase (PK) assay are mainly based on use of ³²P-labeled adenosine triphosphate (ATP); applications of such methods are, however, hampered by radioactive waste and short half-life of ³²P-labeled ATP. Therefore non-radioactive methods, such as fluorescence detection techniques are good alternative. In this review, we describe the principles of four fluorescence techniques (fluorescence intensity endpoint measurement, fluorescence resonance energy transfer (FRET), fluorescence polarization (FP), and fluorescence lifetime imaging) and provide an overview of applications of these fluorescence detection techniques in protein kinase assay, underlining their relative advantages and limitations. Research trends in this field are also highlighted. Figure Schematic representation of kinase assay based on direct fluorescence polarization measurements. The fluorescent peptide, on phosphorylation by kinase, binds to a phosphospecific antibody, which leads to a high FP value     

Synthesis,structure and physical properties of the one-dimensional chain complex of tetrathiafulvalene carboxylate

A new Co(II) coordination polymer bearing TTF carboxylate group, [{Co₂(trioTTF)₂(H₂O)₆}·5H₂O]_n (1) (trioTTF = 2-(5,6,8,9,11,12,14,15-octahydro-[1,3]dithiolo[4,5-h][1,4,13,7,10]trioxadithiacyclopentadecin-2-ylidene)-1,3-dithiole-4,5-dicarboxylate), has been prepared and characterized. In the structure of 1, shorter intermolecular S····S contacts (3.565 Å) are found between the trioTTF groups from neighboring chains. The electric conductivity of 1 is poor due to the bulky crown-ether group, but it exhibits ferromagnetic interaction at low temperature.     

Approximating solutions of neutral stochastic evolution equations with jumps

In this paper, we establish existence and uniqueness of the mild solutions to a class of neutral stochastic evolution equations driven by Poisson random measures in some Hilbert space. Moreover, we adopt the Faedo-Galerkin scheme to approximate the solutions. This work was supported by the LPMC at Nankai University and National Natural Science Foundation of China (Grant No. 10671036)