A new look at φ-pH diagram (Ⅱ) ——All-equilibrium φ-pH diagram for M-ligand-H_2O system <

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｙｏｆｍｅｔａｌ ｌｉｇａｎｄｓｙｓｔｅｍｉｓａｌｗａｙｓｔｈｅｔｏｐｉｃｏｆｍｅｔａｌｌｕｒｇｙｒｅｓｅａｒｃｈｅｒｓ .Ｏｓｓｅｏ Ａｓａｒｅ[1] ｔｒｉｅｄｔｏｃｏｍｐｉｌｅａｇｅｎｅｒａｌｐｒｏｇｒａｍｔｏｐｌｏｔ φ ｐＨｄｉａｇｒａｍｆｏｒＭｅｔａｌ ＮＨ3 Ｈ2 Ｏｓｙｓｔｅｍ ,ｈｏｗｅｖｅｒ ,ｔｈｅｐｌｏｔｔｅｄｄｉ ａｇｒａｍｄｅｖｉａｔｅｓｆｒｏｍ ｐｒａｃｔｉｃａｌｓｏｌｕｔｉｏｎｄｕｅｔｏｉｔｓａｓ ｓｕｍｐｔｉｏｎｓ ,ｗｈｉｃｈｌｅａｄｓｔｏｔ…     

Growth and Optical Studies of a Novel Organometallic Complex NLO Crystal: Tetrathiourea Cadmium(II) Tetrathiocyanato Zinc(II)

Tetrathiourea cadmium(II) tetrathiocyanato Zinc(II) (TCTZ) single crystals were grown in acetone-water mixture solvent using slow solvent evaporation technique and their optical property was studied for the first time. Both thiourea and thiocyanate ligands were combined with the transition metal ions Cd²⁺ and Zn²⁺. The nonlinear optical (NLO) efficiency of TCTZ crystal was tested and measured using Kurtz and Perry technique. The dielectric behavior of the sample was also studied.     

Design of Silica-Supported Dendritic Chiral Catalysts for the Improvement of Enantioselective Addition of Diethylzinc to Benzaldehyde

This article describes an efficient method to design a heterogeneous catalyst for the enantioselective addition of diethylzinc to benzaldehyde. Combining the immobilization of a dendrimer on a silica surface with the introduction of a long alkyl spacer at the periphery of the dendrimer is found to be effective in improving the conversion, selectivity and enantioselectivity.     

一种新型一维配合物的设计及其荧光性能研究

在溶剂热的条件下利用柔性双功能配体制备了新颖的配合物{Cd(Tpebc)(Py)(H_2O)}_n(1)(Tpebc=2-乙氧基-3-[[4-[2-(1H-四唑-5-基)苯基]苯基]甲基]-3H-苯并咪唑-4-羧酸,Py=吡啶)。X-射线单晶衍射测定了该配合物是一维链状结构,并且配合物的中心金属离子都是七配位变形的五角双锥配位构型,与4个氧原子和3个氮原子配位。在室温条件下,目标配合物表现出了强的荧光特性。     

Surface DEAE groups facilitate protein transport on polymer chains in DEAE‐modified‐and‐DEAE‐dextran‐grafted resins

Sepharose FF was modified with diethylaminoethyl‐dextran (DEAE‐dextran, DexD) and/or DEAE (D) to fabricate three types of ion exchangers FF‐DexD (grafting‐ligand resin), FF‐D (surface‐ligand resin), and FF‐D‐DexD (mixed‐ligand resin), for protein adsorption equilibria and kinetics study. It was found that both adsorption capacity and uptake rate (effective diffusivity, D_e) were significantly enhanced by grafting DEAE‐dextran. Notably, the D_e values on FF‐DexD and FF‐D‐DexD (D_e/D₀ > 1.4) were six times greater than those on FF‐D (D_e/D₀ < 0.3). More importantly, the increase of surface‐ligand density greatly enhanced uptake kinetics on FF‐D‐DexD. The results indicate that the surface ligands assisted the transport of bound proteins on polymer chains in the mixed‐ligand resins. That is, surface ligands worked as “transfer stations” between two neighboring chains, resulting in enhanced transport of bound proteins on chains. The research thus disclosed the unique role of surface ligands in facilitating protein uptake kinetics onto polymer‐grafted ion‐exchangers. © 2016 American Institute of Chemical Engineers AIChE J, 62: 3812–3819, 2016     

Tailor-made morphologies for Pd/SiO2 catalysts through sol–gel process with various silylated ligands

With the aim of obtaining highly dispersed, immobilized and accessible catalytically active palladium nanoparticles in a silica support with a tailored morphology, a sol–gel cogelation method is developed. Pd/SiO₂ catalysts are synthesized in ethanol by concomitant hydrolysis and condensation, i.e. cogelation, of a Pd²⁺[L–X–Si(OR)₃]_n complex with Si(OC₂H₅)₄ (TEOS) as network-forming reagent followed by calcinations in air and by reductions of the resulting xerogel catalysts in hydrogen. By varying the nature of L, X and R in the Pd²⁺ complex, the purpose of the present work is to determine the influence of the nature of the L–X–Si(OR)₃ ligand on textural properties of silica and on palladium dispersion in Pd/SiO₂ catalysts.By changing the molecular weight of L–X– and thus its bulkiness of L and X, it is observed that with bulkier silylated ligand, the textural properties of resulting gels are strongly modified from micro- and macroporous materials to very highly micro- and mesoporous materials. In the latter ones, the size of silica particles is smaller and their void fraction is very high. In such a case, palladium particles are not trapped inside silica particles and are then able to migrate and to sinter. The Pd/SiO₂ xerogel catalysts were evaluated in the hydrodechlorination of 1,2-dichloroethane.