Charge Separation in Metal-Organic Framework Enables Heterogeneous Thiol Catalysis

Photoinduced metal–organic framework (MOF) enabled heterogeneous thiol catalysis has been achieved for the first time. MOF Zr-TPDCS-1 , consisting of Zr₆-clusters and TPDCS linkers (TPDCS=3,3′′,5,5′′-tetramercapto[1,1′:4′,1′′-terphenyl]-4,4′′-dicarboxylate), effectively catalyzed the borylation, silylation, phosphorylation, and thiolation of organic molecules. Upon irradiation, the fast electron transfer from TPDCS to Zr₆-cluster is believed to facilitate the formation of the thiyl radical, a hydrogen atom transfer catalyst, which competently abstracts the hydrogen from borane, silane, phosphine, or thiol for generating the corresponding element radical to engender the chemical transformations. The elaborate control experiments evidenced the generation of thiyl radicals in MOF and illustrated a radical reaction pathway. The gram-scale reaction worked well, and the product was conveniently separated via centrifugation and vacuum with a turnover number (TON) of ≈3880, highlighting the practical application potential of heterogeneous thiyl-radical catalysis.     

超微半扁球电极上循环扫描可逆波理论及其验证

本文提出了超微半扁球电极上循环伏安扫描可逆波理论,对不同p,g参数时电流、电位的性质进行了详细的讨论,并用汞超微半扁球电极在四氯苯醌-四丁基高氯酸铵-乙腈体系中的实验对理论进行了验证,实验结果与理论相符。     

有机材料ZnTBP/CA/PhR体系的反饱和吸收特性研究

报道了有机材料ＺｎＴＢＰ／ＣＡ／ＰｈＲ对激光的反饱和吸收特性。理论分析从该材料特有的五能级结构出发，指出三重态的第一激发态在反饱和吸收过程中的重要作用，并用两束光同时照射样品的实验方法进行了验证。该材料的反饱和吸收效应可在功率不太高的连续光下操作     

A novel stereoselective synthesis of 1,2-trans-thioaldoses

A mild and one-pot protocol for the efficient and stereoselective synthesis of 1,2-trans-aldosyl mercaptans is presented.     

Studies of Adsorption Kinetics and Defects of Self‐Assembled Thiol Monolayers on Gold by Capacitance Plane Plot

The capacitive property of an electrode/electrolyte interface can be described by complex capacitance. The capacitance plane plots (CPPs) of ideal polarized and kinetic controlled electrodes are derived based on the concept of complex capacitance. By using CPPs, the capacitance of electrode/electrolyte interface can be conveniently determined. In this work, CPPs obtained in ac impedance experiments are employed for the first time in studying the kinetics of adsorption process of the thiol monolayer. The coverage of octadecanethiol (ODT) monolayer on gold is examined as a function of adsorption time. The adsorption process of ODT molecules on gold exhibits two distinct phases: an initial rapid step followed by a slow one. The simple Langmuir model best explains our experimental data in the initial adsorption stage. CPPs and cyclic voltammetry (CV) indicate that, in the initial adsorption step, the ODT monolayer contains defects whose number decreases with the increasing of adsorption time.     

一种板级高速串行传输接口设计

在计算机和电子工业应用中板级间的高速传输接口设计一直扮演着至关重要的角色。所需传输的数据量与日俱增,本文提出了一种基于高速串行收发器的板级传输接口设计方案,使用光纤作为传输信道,降低了误码-率;采用的Aurora 64B/55B协议使得编码开销降到了3%左右,相比于上一代传输协议,大大增加了有效数据传输率,测试结果表明,此方案可以实现500Mbps到200Gbps以上的数据吞吐量。     

Vortex states in soft magnets in two and three dimensions

The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the three-dimensional particles are anhysteretic and fit a M(H)/M_s=tanh(cμ₀H) law, whereas the two-dimensional arrays show irreversible segments in the first and third quadrants where the planar vortex state transforms to a collinear state by discontinuous rotation of magnetization about an axis perpendicular to the vortex axis. The additional symmetry of the spherical particle allows this rotation to occur continuously, without energy barriers due to the demagnetizing field.