吡喃盐化合物的合成及应用研究进展

吡喃盐是一类具有独特化学反应活性和光物理性质的杂环化合物,在有机合成、生物传感和光电材料等许多领域展现了良好的应用前景.结合本课题组的研究成果,综述了α-非活性吡喃盐和α-活性吡喃盐化合物的合成研究进展,并介绍了一些典型吡喃盐化合物在有机合成、光敏剂、离子液体和荧光传感材料等领域的应用.     

聚氰基丙烯酸乙酯空心纳米纤维的制备

通过溶液聚合法制备了具有空心结构的聚氰基丙烯酸乙酯纳米纤维,纤维直径为50~100 nm.研究了3种溶液体系对形成聚氰基丙烯酸乙酯纳米纤维形貌与直径的影响,并探讨了其形成机理.通过调控溶液体系内外环境可得到不同形貌的聚合物纤维,且纤维表面表现出疏水性质.该方法适用于平整且具有粗糙结构的表面.所形成的聚氰基丙烯酸乙酯纳米纤维涂层可用于基底的疏水改性.     

基于介电电泳的微流控细胞分离芯片的研究进展

细胞分离技术是细胞分选和细胞种群纯化的重要手段,在生物、医学、农业、环境等许多领域都有重要的应用,是当前生化分析领域的国际研究热点。本文介绍了基于介电电泳的微流控细胞分离芯片的研究现状,阐述了介电电泳的工作原理,并依据细胞尺寸、电极形状、外加信号方式等影响细胞介电电泳的关键因素对不同类型的微流控细胞分离芯片进行了详细介绍,并对该技术的未来发展趋势做了展望。     

Rapid determination of products of phenol hydrogenation in a supercritical water system using headspace gas chromatography

This paper reports a headspace analysis technique for the determination of products, i.e., cyclohexanone (CE) and cyclohexanol (CL), of phenol hydrogenation in a supercritical water reaction system (SWRS) with water removal by hydrate formation. An addition of anhydrous calcium chloride leads to water absorption resulting in crystal water; thus, the samples can be quantitatively measured without the influence of water. After achieving equilibrium at 150°C and maintaining it for 5 min, the obtained results showed a relative standard deviation of less than 5.3% and the recovery ranged from 93% to 104%. The presented method is simple and accurate for the analysis of CL, CE and phenol in samples from phenol conversion in SWRS.     

N-支套索冠醚异羟肟酸的合成及其钴(II)配合物的氧加合性能

由乙二胺四乙酸二酐和多缩乙二醇出发,合成了一系列具有N-支套索冠醚结构的二异羟肟酸配体(L1H2~L4H2)及其钴(II)配合物(Co L1~Co L4),以IR,1H NMR,MS和元素分析进行结构表征。测定在不同温度下Co L1~Co L4的氧加合常数In KO2和热力学参数ΔH0、ΔS0,研究了氮杂冠醚环的大小对配合物氧加合性能的影响。     

FI催化剂配体的研究进展

FI催化剂作为一类新型聚烯烃催化剂,具有高活性、耐高温等特性,在催化聚合方面表现出良好的性能,不但可以催化乙烯与极性及非极性单体共聚,而且可以通过改变主催化剂苯氧基亚胺配体的结构,得到具有不同结构的聚合物。本文介绍了FI主催化剂的基本结构、合成方法、结构与催化性能的关系以及基于苯氧基亚胺配体基本结构的新型催化剂的研究进展。     

Adsorption of carbon disulfide on activated carbon modified by Cu and cobalt sulfonated phthalocyanine

A series of adsorbents were studied for removal efficiency of carbon disulfide (CS₂) under micro-oxygen conditions. It was found that activated carbon modified by Cu and cobalt sulfonated phthalocyanine (CoSPc) denoted as ACCu–CoSPc showed significantly enhanced adsorption ability. Reaction temperature was found to be a key factor for adsorption, and 20 °C seems to be optimal for CS₂ removal. Samples were analyzed by N₂-BET, XRD, XPS, SEM–EDS and CO₂-TPD. The characterization results demonstrated that large quantities of SO₄ ^2? anions were formed and adsorbed in the reaction process. SO₂, CS₂ and COS were detected in the effluent gas generated from the temperature programmed desorption of ACCu–CoSPc–CS₂. Therefore, it can be concluded that ACCu–CoSPc most likely acted as a catalyst in the adsorption/oxidation process on the surface of the impregnated sample. The generated sulfide and sulfur oxide can cover the active sites of adsorbents, resulting in pronounced reduction of adsorbent activity. Finally, the exhausted ACCu–CoSPc can be regenerated by thermal desorption.     

Cationic Cobalt(III)‐Catalyzed Aryl and Alkenyl CH Amidation: A Mild Protocol for the Modification of Purine Derivatives

A cationic cobalt(III)‐catalyzed direct C?H amidation of unactivated (hetero)arenes and alkenes by using 1,4,2‐dioxazol‐5‐ones as the amidating reagent has been developed. This transformation proceeds efficiently under external oxidant‐free conditions with a broad substrate scope. Moreover, 6‐arylpurine compounds, which often exhibit high potency in antimycobacterial, cytostatic, and anti‐HCV activities, can be smoothly amidated, thus offering a mild protocol for their late stage functionalization.     

Non‐Covalent Functionalization of Graphene with Bisphenol A for High‐Performance Supercapacitors

The reduced graphene oxide (RGO)/bisphenol A (BPA) composites were prepared by an adsorption‐reduction method. The composites are characterized by X‐ray diffraction (XRD), UV‐vis, thermogravimetric (TG) analysis, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The results confirm that BPA is adsorbed on the basal plane of RGO by π‐π stacking interaction. Furthermore, the electrochemical behaviors were evaluated by cyclic voltammetry, galvanostatic charge/discharge techniques and electrochemical impedance spectroscopy (EIS). The results show that the RGO/BPA nanocomposites exhibit ultrahigh specific capacitance of 466 F·g^?1 at a current density of 1 A·g^?1, excellent rate capability (more than 81% retention at 10 A·g^?1 relative to 1 A·g^?1) and superior cycling stability (90% capacitance decay after 4000 cycles). Consequently, the RGO/BPA nanocomposites can be regarded as promising electrode materials for supercapacitor applications.