橡胶门尼粘度标准物质的研制

介绍橡胶门尼粘度标准物质的研制过程。该标准物质的均匀性、稳定性良好,定值准确可靠,符合JJG1006－94的要求。     

Hydrothermal synthesis, structure and quantum chemistry of transition metal complex supported by metal-oxo cluster [(Ni(phen)22 (ξ-Mo8O26)]

A nickel-1,10-phenanthroline complex supported on an octamolybdate, [(Ni(phen)_{2 2}(ξ-Mo₈O₂₆)], has been hydrothermally synthesized with MoO₃, H₂MoO₄, Ni(OAc)₂ 6H₃O and 1,10-phenathroline (1,10-phen) as raw materials. The crystals of the compound belong to monoclinic P2₁/n space group,a = 1.2952(2),b = 1.6659(10),c = 1.3956(12) nm, β =106.273(8)°,V = 2.8906(5) nm³,Z = 2. 5604 observable reflections (I >2σ(I)) were used for structure resolution and refinements to converge to finalR ₁ = 0.0414,wR ₂ = 0.0815. The result of structure determination shows that the compound contains octamolybdate possessing a novel structure type (named as ξ-isomer). The feature of ξ-[Mo₈O₂₆]^4- is that it is composed of Mo₆O₆ ring and two MoO₆ octahedral located at cap positions on opposite faces. The Mo₆O₆ ring contains two octahedral and four trigonal-bipyramidal Mo^VI atoms. Each ξ-[Mo₈O₂₆]^4- unit is bonded with two [Ni(phen)₂]²⁺ through terminal oxygen atoms of octahedral and neighbouring trigonal-bipyramidal Mo atom in the Mo₆O₆ ring. IR and UV-Vis spectra of the compound were measured and its electronic structure was studied by EHMO method.     

土壤淋溶柱色谱中同系物、氯代苯保留值与流动相组成、沸点的交点规律

基于土壤淋溶柱色谱符合logk'-ψ的线性保留方程,在同系物（正构烷基苯、甲基苯）和氯代苯中,同类溶质与固定相（土壤）和淋洗剂（甲醇-水）有相似的作用方式,所以溶质保留值（logk'）与淋洗剂有机调节剂浓度间存在浓度交点,与沸点间存在沸点交点规律,并用实验进行了验证。     

一种近红外花菁染料的合成及其应用于生物大分子的测定

光谱性质;蛋白质;核酸测定;一种近红外花菁染料的合成及其应用于生物大分子的测定     

舞花姜的化学成分

舞花姜（Ｇｌｏｂｂａｒａｃｅｍｏｓａｓｍｉｔｈ）为姜科舞花姜属植物,产于我国南部、西南部等地。其根和果实在民间药用,有健胃、消炎的功能,用于治疗胃炎、消化不良、急慢性肾炎等［１］。尚未见有关舞花姜属植物化学成分和药理活性的研究报道,为此我们对其地下部分的化学成分进行了研究。乙醇提取物的石油醚可溶部分经硅胶柱和萄聚糖凝胶柱层析分离得到五个化合物,经光谱鉴定为木栓酮（ｆｒｉｅｄｅｌｉｎ１）,ｃｙｃｌｏｅｕｃａｌｅｎ－ｏｌ（２）、３－羟基－豆甾－５烯－７－酮（３－ｈｙｄｒｏｘｙ－ｓｔｉｇｍａｓｔ－５－…     

稀土掺杂ZnS纳米晶中稀土离子与纳米基质之间的能量传递

以甲基丙烯酸为表面包覆剂在水／醇溶液中合成了ZnS:Eu^3 ,ZnS:Tb^3 纳米晶,用傅里叶变换红外光谱和X射线粉末衍射谱表征了样品的表面与晶型,样品均为立方闪锌矿型,没有出现与稀土离子相关的相;用光致发光和激发谱研究了样品中的发光过程,其中ZnS:Tb^3 纳米晶中存在纳米基质与Tb^3 之间的能量传递,并引起Tb^3 的特征发射。     

Ming-Phos/铜催化的亚甲胺叶立德与硝基烯烃的不对称[3＋2]环加成反应

手性吡咯烷骨架是合成具有生物活性的化合物、天然产物、药物和催化剂的重要中间体,其高效的不对称合成方法是有机化学研究热点之一.该工作通过一类新型的Ming-Phos手性配体实现了铜催化的亚甲胺叶立德与硝基烯烃的不对称[3+2]环加成反应,以较好的非对映选择性和对映选择性合成了一系列手性吡咯烷类化合物（ee值高达98%,产率高达95%）.该方法具有反应条件温和、操作简单、底物普适性广以及配体合成简单易制备等众多优点.     

聚合物前驱体3D打印制备高性能陶瓷

3D打印制备陶瓷可以实现结构-材料设计一体化,为复杂形状陶瓷材料快速成型提供了新途径。但是传统的3D打印制备陶瓷是以陶瓷粉末或陶瓷颗粒为打印材料,存在陶瓷构件尺寸精度差、表面光洁度低和力学性能不佳等问题。近年来,以聚合物前驱体为打印材料,通过3D打印成型、高温裂解等工艺制备高性能陶瓷技术的出现为改善这些不足提供了新方法,成为3D打印陶瓷领域的研究热点。本文概述了聚合物前驱体3D打印制备高性能陶瓷的研究进展,重点阐述了本体聚合物前驱体、聚合物前驱体/光敏化合物、聚合物前驱体/巯基化合物、光敏基团改性聚合物前驱体、增强体/聚合物前驱体五种典型材料体系的研究现状,并对其今后的发展方向进行了展望。     

A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid:Electrochemical Synthesis and Electrochromic Properties

An imidazolium-based ionic liquid(IL) modified triphenylamine derivative,namely 1-(4-((4-(diphenylamino)benzoyl) oxy)butyl)-3-methyl imidazole tetrafluoroborate(TPAC_6 IL-BF_4),was designed and synthesized,and further applied with 3,4-ethylene dioxythiophene(EDOT)to prepare conjugated copolymer P(EDOT:TPAC_6 IL-BF_4) via electrochemical polymerization.The cyclic voltammetry curves show that the copolymer P(EDOT:TPAC_6 IL-BF_4) possesses two pairs of redox peaks,which should be ascribed to the redox behaviors of EDOT and triphenylamine.The ultraviolet-visible(UV-Vis) absorption spectrum of P(EDOT:TPAC_6 IL-BF_4) exhibits one maximum absorption peak at 580 nm and a small shoulder characteristic peak at 385 nm under neutral state which are assigned to π-π~* conjugated structure of EDOT and triphenylamine.After being applied at the positive voltage,the copolymer color changes from dark blue to light blue,which is close to the color of poly(3,4-ethylenedioxythiophene)(PEDOT).Surprisingly,the copolymer P(EDOT:TPAC_6 IL-BF_4) shows shorter switching time of 0.37 s,0.30 s at 580 nm and 0.38 s,0.45 s at 1100 nm compared with PEDOT.It is more intriguing that the copolymer P(EDOT:TPAC_6 IL-BF_4) exhibits electrochromism even in free supporting electrolyte.The results confirm that the existence of imidazolium-based ionic liquid has an improvement on the ion diffusion properties and the switching time of conjugated polymer,which may provide a potential direction for the preparation of high-performance electrochromic materials.     

Light‐Induced Chiral Iron Copper Selenide Nanoparticles Prevent β‐Amyloidopathy In Vivo

The accumulation and deposition of β‐amyloid (Aβ) plaques in the brain is considered a potential pathogenic mechanism underlying Alzheimer's disease (AD). Chiral l/d ‐Fe_xCu_ySe nanoparticles (NPs) were fabricated that interfer with the self‐assembly of Aβ42 monomers and trigger the Aβ42 fibrils in dense structures to become looser monomers under 808 nm near‐infrared (NIR) illumination. d ‐Fe_xCu_ySe NPs have a much higher affinity for Aβ42 fibrils than l ‐Fe_xCu_ySe NPs and chiral Cu_2?xSe NPs. The chiral Fe_xCu_ySe NPs also generate more reactive oxygen species (ROS) than chiral Cu_2?xSe NPs under NIR‐light irradiation. In living MN9D cells, d ‐NPs attenuate the adhesion of Aβ42 to membranes and neuron loss after NIR treatment within 10 min without the photothermal effect. In‐vivo experiments showed that d ‐Fe_xCu_ySe NPs provide an efficient protection against neuronal damage induced by the deposition of Aβ42 and alleviate symptoms in a mouse model of AD, leading to the recovery of cognitive competence.