Self-hydroxylation of perbenzoic acids at a nonheme iron(II) center

Treatment of mononuclear nonheme iron(II) complexes bearing two cis-labile sites with perbenzoic acids results in the self-hydroxylation of the aromatic ring to form the corresponding iron(III)-salicylate complexes through an intramolecular oxo-transfer process.     

基于静电吸附甲苯胺蓝和纳米金固定过氧化物酶生物传感器的研究

以玻碳电极为基底,电聚合邻氨基苯甲酸(ABA),使其形成带负电的界面,通过分子间静电作用力,自组装一层带正电荷的电子媒介体甲苯胺蓝(TB),再通过媒介体的氨基吸附纳米金,最后静电吸附固定辣根过氧化物酶制备出H2O2传感器。探讨了膜聚合时间、媒介体组装时间、pH、温度、工作电位对电极响应的影响。在优化的实验条件下,该传感器对H2O2电流响应与其浓度为1.5×10-5~1.3×10-3mol/L范围内呈线性关系;检出限为5.6×10-6mol/L。此外,该传感器具有较低的工作电位,能有效地消除抗坏血酸等的干扰。     

Compact Sums of Toeplitz Products on Weighted Bergman and Dirichlet Spaces

On the weighted Bergman and Dirichlet spaces, we characterize the compactness for operators which are finite sums of products of several Toeplitz operators. Our results extend the several known results by using complete different arguments.     

碳包覆对磷酸铁锂高温循环性能的影响机理

制备了碳包覆完整和不完整的2种磷酸铁锂，用以研究碳包覆对使用广泛的磷酸铁锂/石墨电池体系高温循环性能的影响机理。X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、粉末电阻率和扣式电池等测试表明2种物料的晶体结构、颗粒尺寸、克容量等性能相近，仅碳包覆完整度差异大。将2种物料组装成磷酸铁锂/石墨软包电芯并在60℃高温下进行1C充放电循环测试，结果表明完整的碳包覆可使其在1 250次循环后的容量保持率由80.4%提升至84.9%。在此基础上，我们成功定量极化容量和热力学容量的改善幅度，可知二者占比分别为76%和24%，这说明碳包覆的主要影响机制是为磷酸铁锂正极提供完整的导电网络，进而降低极化损失。铁溶出测试结果表明，碳包覆的直接抑制作用并不明显，其主要作用可能是通过降低电芯中的水含量从而间接抑制铁溶出，并减少部分热力学容量损失。     

Synthesis,characterization, and catalytic activity of titanium iminophenoxide complexes in relation to the ring‐opening polymerization of L‐lactide and ε‐caprolactone

This study synthesized a series of titanium iminophenoxide complexes and investigated their suitability as catalysts for the ring‐opening polymerization of L ‐lactide (L ‐LA) and ε‐caprolactone (CL). Complexes with bidentate ligands demonstrate higher catalytic activity than their tridentate counterparts since the third coordination atom needs to contend with L ‐LA and CL. Differences in the geometric framework of bidentate ligands also influence the catalytic activity. Type II ligands (N, N‐trans form of Ti complex) prevent the coordination of monomers to Ti thereby decreasing the initiation rate. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013     

Synthesis of nickel-doped titanium-oxo clusters with enhanced visible-light photocatalytic activity

Transition Metal Chemistry - Two new Ni-doped titanium-oxo clusters of the formula [Ni2Ti4(μ3-O)2(μ2-O)2(BA)12(CH3CN)(H2O)]?CH3CN (Ti4Ni2BA12; BA?=?benzoate) and...     

Relating Nonuniform Deformations to Fracture in Uniaxially Loaded Non-Woven Fiber Networks

Experimental Mechanics - The porous, cellulosic fiber networks in commercial paper are generally regarded as continuum materials when the sheet is large compared to the size of fiber agglomerates...     

Pyrene Substituted Phthalonitrile Derivative As a Fluorescent Sensor For Detection of Fe3+ Ions in Solutions

Journal of Fluorescence - In this current study, the novel bis[4,5-(pyrene-2-yl)-3,6-(hexyloxy)] phthalonitrile (SPN) fluorophore has been successfully synthesized. Structural characterization of...