对甲苯磺酸三乙铵作为气相色谱固定相测定酱油中的苯甲酸

苯甲酸具有杀灭或抑制微生物繁殖的作用,其作为食品防腐剂,被广泛用于酱油、罐头、酱菜以及饮料等食品中。但摄入过量的苯甲酸会影响人体的肝脏功能,对人体产生危害,因此食品中苯甲酸的测定一直受到人们的关注。用于测定食品中苯甲酸的气相色谱固定相有许多,比如SE-30[1]、DEGS     

对甲基苯磺酸亚铈催化一锅法合成取代2,3-二氢-4(1H)-喹唑啉酮

以对甲基苯磺酸亚铈为催化剂,靛红酸酐、醛和铵盐或伯胺为原料,在乙醇水溶液中三组分一锅法合成了一系列单取代和双取代2,3-二氢-4(1H)-喹唑啉酮衍生物。考察了溶剂条件及催化剂用量对产率的影响。经催化剂循环研究,催化活性无明显变化。产物的结构通过熔点、IR、1H NMR、13C NMR、质谱和元素分析进行测定和结构表征。     

硝酸铈对Calpain基因表达的影响

运用逆转录聚合酶链式反应研究了硝酸铈对大白鼠肝脏Calpain Ⅰ、Calpain Ⅱ基因表达的影响。腹腔注射高浓度硝酸铈可引起Calpain基因表达的变化，提示硝酸铈对肝细胞的损伤可能是因为细胞内钙超负荷所致。     

一种铈（Ⅲ）配合物对含石墨粘结涂层耐蚀性的影响

为了改善含石墨粘结涂层的耐蚀性，首先对这种涂层在腐蚀环境中耐蚀性差的原因进行了分析，然后将二正丁基磷酸、ＣｅＦ＿３、Ｓｂ＿２Ｏ＿３和一种Ｃｅ（Ⅲ）配合物Ｃｅ（ＮＯ＿３）（Ｃ＿８Ｈ＿（１８）ＰＯ＿４）＿２分别添加于酚醛环氧－ＭｏＳ＿２－石墨粘结涂层中，考察了它们对这种涂层耐蚀性的影响，并对含Ｃｅ（ＮＯ＿３）（Ｃ＿８Ｈ＿（１８）ＰＯ＿４）＿２的涂层和空白样涂层进行了表面分析。盐雾试验表明，添加Ｃｅ（ＮＯ＿３）（Ｃ＿８Ｈ＿（１８）ＰＯ＿４）＿２可以有效地抑制涂层中ＭｏＳ＿２的氧化和由石墨所引起的金属底材之电化学腐蚀；根据Ｘ射线光电子能谱分析结果可知，添加Ｃｅ（ＮＯ＿３）（Ｃ＿８Ｈ＿（１８）ＰＯ＿４）＿２之所以能够提高含石墨粘结涂层的耐蚀性，应当归因于它在ＭｏＳ＿２晶体表面和金属底材表面的吸附。因此，Ｃｅ（Ⅲ）配合物Ｃｅ（ＮＯ＿３）（Ｃ＿８Ｈ＿（１８）ＰＯ＿４）＿２是含石墨粘结涂层的一种实用性能良好的新型防腐添加剂。     

铈（Ⅲ）,铈（Ⅳ）与植酸生成的固态配合物的研究

铈（Ⅲ）、铈（Ⅳ）与植酸生成的固态配合物的研究黎晓霞杨瑛＊刘建民杨汝栋（兰州大学化学系兰州７３００００）关键词铈（Ⅲ），铈（Ⅳ），植酸，固态配合物１９９６－１１－２０收稿，１９９７－０５－２６修回植酸（Ｈ１２ＩＨＰ）作为沉淀剂已被用于Ｔｈ４＋的定量测...     

Effect of Solvents on Oxidation of 1, 1′-Bi-2-naphthol

A novel biomimetic catalyst of complex Cu (p-OTs)2/ethanolamine (1 : 1 ) was used to oxidize 1, 1′-bi-2naphthol into xanthene derivatives with a relative high yield in a mixed solvents of dimethyl sulfoxide (DMSO) and CH3OH. The studies on the effect of some solvents on the yield of xanthene derivatives indicates that the yield reduces dramatically with the increase of the content of H2O in the mixed solvents of H2O and DMSO. No product can be obtained when the content of H2O is up to 70%. The cyclic voltammetric study demonstrated that the copper ion in complex Cu(p-OTs)2/ethanolamine(1:1) is reduced via a twostep one-electron reduction process from Cu (Ⅱ) to Cu in the mixture of DMSO and H2O. Water as a poor solvent in respect to the reactants probably hampered the coordination of 1, 1′-bi-2-naphthol to copper/amine complex and led to the insufficient catalytic efficiency of complex Cu(p-OTs),/ethanolamine(1:1).     

温和条件下对甲基苯磺酸铝高效催化一锅法合成β-氨基酮衍生物

室温条件下,对甲基苯磺酸铝可有效催化芳香酮、芳香醛和芳香胺的Mannich反应,三组分"一锅法"合成了一系列β-氨基酮衍生物.考察了溶剂及反应条件对产率的影响.反应结束后,催化剂经简单相分离可回收并多次重复使用,催化活性无明显下降.产物结构经IR,~1H NMR,元素分析进行表征.     

Crystal Structure and Properties of a Copper(Ⅱ) Complex Containing p-Toluenesulfonate and Imidazole Ligands

A novel supramolecular mixed ligand complex of formula [Cu(PTS)2(Him)2(H2O)2] (C20H26CuN4O8S2,PTS=p-toluenesulfonate,Him=imidazole) has been synthesized in aqueous solution and characterized by elemental analysis,IR and single-crystal X-ray diffraction.The compound crystallizes in the monoclinic system,space group P21/n,Z=2,a=5.650(2),b=14.671(3),c=14.638(3),β=100.10(3)°,V=1194.60(4)3,Dc=1.607 g/cm3,μ(MoKα)=1.143 mm-1,F(000)=598,R=0.0615 and wR=0.1503 for 1752 observed reflections with I 2σ(I).The copper(II) ion in the complex adopts a slightly distorted octahedral coordination geometry and is six-coordinated with N2O4 donor set consisting of two nitrogen atoms and four oxygen atoms provided by the ligands of two imidazole molecules,two water molecules and two p-toluenesulfonate ions.The sulfonate group of the PTS ligand remains weak-coordinated and forms a number of hydrogen bonds with water molecules and imidazole ligands.X-ray structural analysis reveals that the coordination molecules are connected to form a 3-D supramolecular framework by electrostatic interaction,weak van der Waals forces,hydrogen bonding and π-π interaction.The thermal behaviour of the title complex was investigated by using DSC and TG-DTG techniques.     

Synthesis of Novel Poly(ethyleneglycol)-400 Ionic Liquid and Its Application in Morita–Baylis–Hillman Reaction

Novel Poly(ethyleneglycol)-400 ionic liquid containing imidazolium cations have been synthesized by the atom-efficient reaction of 1,2-dimethylimidazole with p-toluenesulfonate; the p-toluenesulfonate provides the anionic component of the resultant ionic liquid. It have been used for the first time as a new solvent for the Morita–Baylis–Hillman reaction under ambient conditions. A wide variety of aldehydes and active olefins participate very efficiently, resulting in good to excellent yields of products.      

硼铈共掺杂纳米TiO2光催化降解三氯杀螨醇和菊酯类农药

采用溶胶-凝胶法在钛酸丁酯水解过程引入硼酸、硝酸铈,制备具有光催化活性的硼铈共掺杂纳米二氧化钛（TiO2）,经XRD、TEM、FT-IR、UV-Vis-DRS表征晶体结构,在日光灯照射下,光催化降解三氯杀螨醇、高氟氯氰菊酯、氟戊菊酯农药。结果表明：硼铈共掺杂的TiO2只有锐钛矿型,而纯的或掺铈的TiO2有含有锐钛矿型、金红石相和少量板钛矿型,UV-Vis-DRS测定结果表明硼铈共掺杂的TiO2禁带宽度变小,硼铈共掺杂的TiO2在可见光区吸光度高于掺杂铈和不掺杂的TiO2,在420nm~850nm有强的吸收;在同样光照下对三氯杀螨醇、高氟氯氰菊酯、氟戊菊酯的降解试验证明硼铈共掺杂纳米TiO2的光催化活性高于不掺杂或只掺杂铈的TiO2。