不饱和聚酯型人造大理石研究进展

综述了不饱和聚酯型人造大理石的研究进展;回顾了人造大理石的研究现状,指出了其制备研究中存在的性能及工艺缺陷;分析了填料种类、混合填料粒径、黏结剂及制备工艺对人造大理石强度、韧性、斑印及吸水率等性能的影响,并就未来聚酯型人造大理石的性能改进及工艺优化进行了展望.     

表面分子印迹技术在分析化学中的应用研究进展

表面分子印迹聚合物因其高效的靶向识别能力、丰富的活性结合位点和优越的吸附/解吸附动力学性能,日益受到分离和分析化学领域研究者的广泛关注。本文系统介绍表面印迹技术的概况,如机理、分类、特点等,重点综述了表面印迹技术在环境分析、食品分析、生物分析和医药分析等领域的研究运用现状,并对表面印迹技术潜在的研究方向和应用前景进行了展望。     

N-(4’-芳环取代嘧啶基-2’-基)-2-乙氧羰基苯磺酰脲衍生物的合成及抑菌活性

设计合成了14个4位芳环取代的嘧啶磺酰脲衍生物,其结构均通过1H NMR和高分辨质谱表征确定,并进行了体外抑菌活性测试.初步测试结果表明,在浓度为50 mg/L时,大部分目标化合物对黄瓜灰霉病、油菜菌核病和水稻纹枯病表现出一定的抑菌效果,其中化合物7g,7h和7i表现出较高的抑菌活性;但大部分目标化合物对黄瓜枯萎病、黄瓜褐斑病及苹果轮纹病的抑菌活性与对照药百菌清尚有差距.     

对α-四芳氧基取代酞菁溴化位置的思考

为了研究α-四芳氧基取代酞菁在溴化反应中溴原子的取代位置问题,本文合成了1,8,15,22-四(4-甲基苯氧基)酞菁钯(Pc～1)、1,8,15,22-四(2,6-二溴-4-甲基苯氧基)酞菁钯(Pc～2)、1,8,15,22-四(2,4-二特丁基苯氧基)酞菁钯(Pc～3)和1,8,15,22-四(2,4-二特丁基苯氧基)酞菁铜(Pc～4),并对它们分别进行了相同条件下的溴化,得到相应的溴化产物Pc～5、Pc～6、Pc～7和Pc～8.综合对比研究酞菁Pc～1-4及其溴化产物Pc～5-8的最大吸收波长,推测酞菁溴化反应发生在酞菁大共轭体系的苯环上,而不是芳氧取代基的苯环上,并从电子结构的角度简要的说明了原因.     

Organocatalytic double arylation of 3-isothiocyanato oxindoles: Stereocontrolled synthesis of complex spirooxindoles

Quinones, precursors of aromatic structures, were firstly employed as the electrophiles for the organocatalytic Michael addition/cyclization cascade reaction with versatile 3-isothiocyanato oxindoles. Chiral bifunctional organocatalyst was appropriate for this enantioselective transformation to afford a variety of novel spirooxindoles, possessing a spirocyclic stereocenter adjacent to the aromatic ring, via asymmetric double arylation. These synthesized spirooxindoles are very difficult to access by the reported methods and were obtained in excellent chemical yields with excellent enantioselectivities.     

作为Be2+磷光探针的含9-冠-3的铱配合物

以4′-(2-苯并噻唑基)苯并-9-冠-3(BTZ9C3)为主配体,用2,2′-联吡啶(bpy)及3-三氟甲基-5-(2′-吡啶基)-1,2-二唑(Hfppz)辅助配体分别合成了离子型铱配合物[Ir(BTZ9C3)2(bpy)]PF6(1)和中性铱配合物[Ir(BTZ9C3)2(fppz)](2)。配合物的结构通过核磁、高分辨质谱进行了表征,并测定了配合物1的单晶结构。对它们光物理性能的研究表明,2种配合物掺杂在PMMA中的发光为黄绿光发射,配合物1的发光波长为535 nm,配合物2的发光波长为541 nm,发光量子效率分别为10.8%,45.0%,发光寿命分别为3.01和2.58μs,为典型的磷光发射。通过循环伏安法测得配合物1和2的HOMO能级分别为-5.60和-5.35 eV。2种配合物对Be2+都有发光增强的选择性识别效果,化学计量比为1∶2,最低检测限低至6.0μmol·L-1。抗干扰能力方面,离子型配合物1的抗干扰能力较好,而中性配合物2受Al3+的干扰较大。     

理工科专业基础核心课程思政教学实践——以化工原理课程为例

The principles of chemical engineering is the foundation of chemical engineering professional core courses. This article introduces the goal and content of course Ideology and politics for principles of chemical engineering course. Ideological education has been carried out on the teachers' quality, knowledge, cases, historical personages, and teaching practice to provide reference for education in science and engineering course.     

棒状硫醇液晶的合成

通过亲核取代反应引入硫醇官能团,利用缩合反应形成苯甲酸联苯酯基元,合成了以苯甲酸联苯酯为液晶基元分子端部含有硫醇基团的棒状分子--4′-（6-巯基己烷氧基）-4-烷氧基-苯甲酸联苯酯(4a~4c),其结构经¹H NMR、 IR、 HR-MS(ESI)和元素分析表征。偏光显微观察和差示扫描量热分析结果表明：4在60~170 ℃表现出热致性近晶A相与向列相。随着端部烷氧链的增长,4的近晶A相温度区间由14 ℃拓宽到38 ℃,而清亮点由170 ℃逐渐降低至129 ℃。     

The influence of temperature on the phase behavior of ionic liquid aqueous two-phase systems

In this article, the equilibrium behavior of solutions of 1-ethyl-3-methylimidazolium dimethyl phosphate ([Emim]DMP) and ethyl acetate or acetone in aqueous two-phase system (ATPS) was discussed to understand the liquid–liquid equilibrium (LLE) behavior of these organic solvents. Thus, we determined phase diagrams and LLE data at 303.15, 308.15, 313.15, and 323.15 K for the investigated biphasic systems. Four empirical equations were used to study the tie lines. The results showed that for the [Emim]DMP?+?acetone?+?water biphasic systems within the investigated temperature range, temperature influences the phase behavior, but for the [Emim]DMP?+?ethyl acetate?+?water biphasic systems within the investigated temperature range, there are no notable changes on the phase behavior with rising temperature. The results may have important applications for the separation of antibiotics and for the recovery of ionic liquids (ILs).     

不对称催化合成2-[[3-{[3-氯-5-(三氟甲基)吡啶-2-基]-氧基}苯氧基](苯基)甲基]丙烯酸甲酯

以苯甲醛、丙烯酸甲酯、2,3-二氯-5-三氟甲基吡啶和间苯二酚为原料,分别合成了MBH乙酸酯（6）和取代苯酚（9）;在(DHQD)₂PHAL催化下,6和9经不对称反应立体选择性合成了2-【【3-{[3-氯-5-(三氟甲基)吡啶-2-基]-氧基}苯氧基】(苯基)甲基】丙烯酸甲酯,产率50%, ee 94%,其结构经¹H NMR, ¹³C NMR和HR-MS确证。