Synthesis of Macrocyclic Arsinous Acid Estcrs

MacrocyclicarsinousacidestersareusuallypreparedbycondensationofdichloroalkylarsinesRAsCI,Iwithdidsinthepresenceoforganicalkali].ThemethoddescribedhereinvolvesthetransformationofintermediatefromItohis(dimethylamino)alkylarsineRAs(NMe,),2andthereactionof2withdidsindryTHFtoleadtotheformationoftitlecompounds.2canreactsmoothlywithdidsintheabsenceoforganicalkalitogeneratecorrespondingmacrocyclicarsinousacidesters4anddimethylaminewhichescapesfromthereactingsystemasagasinreflux.Althoughonemoreste…     

新型氮杂大环化合物的研究2: 四吡唑类卟啉大环化合物的合成 及配位性能

报道了几种四吡唑类卟啉大环化合物的合成及其对Ru^2^+离子的配位性能。结果表明,配体环中4个sp^2杂化N原子均参与对Ru^2^+配位,形成一个近似配位平面,另有两个相同或不同的轴向配体位于平面上下,形成稳定的八面体配位结构。根据轴向配体的配位稳定性可方便地将其进行交换。     

Theoretical Study of Small Water Clusters of Sulfur Dioxide

The intermolecular clusters of sulfur dioxide with water, SO2(H2O)n (n = 2～5), are studied by using B3LYP density functional theory and MP2 ab initio methods along with the large basis sets (6-311++G(d,p) and aug-cc-pVDZ). The equilibrium geometries, intermolecular binding energies, and anharmonic frequencies of the clusters are calculated and compared with those of pure water clusters and available experiments. SO2 tends to form cyclic hydrogen-bonded complexes with two or three water molecules. In the larger clusters, however, water molecules begin to retain the structure of pure water clusters and segregate from SO2. Infrared absorption assignments for the small clusters are discussed to resolve a possible incorrect assignment in a recent spectroscopic experiment on the clusters.     

钒钼复合氧化物表面上激光促进异丁烷选择氧化制甲基丙烯酸

表面反应;钒钼复合氧化物表面上激光促进异丁烷选择氧化制甲基丙烯酸     

5,10,15,20-四(对-癸酰氧基苯基)卟啉过渡金属配合物的合成与表征

液晶;5;10;15;20-四(对-癸酰氧基苯基)卟啉过渡金属配合物的合成与表征     

N,N′- 双(3-羧基水杨醛叉缩胺乙基)草酰胺均双核铜(Ⅱ),镍(Ⅱ)配合物合成和性能研究

近来发现草酰胺具有多原子成桥功能,Kahn和廖代正等人^[1,2]设计合成一些对称和不对称草酰桥联的双核及多核配合物,并对其性质进行研究,本文报导N,N'-双（3－羧基水杨醛叉缩胺乙基）草酰胺配体及其铜（II）,镍（II）均双核配合物的合成和表征,及铜双核配合物的电化学性能研究。     

血管紧张素转化酶活性抑制剂──丝素肽的分离、纯化和结构鉴定

 可溶性丝素粉末经碱性蛋白酶Alcalase水解后 ,其酶解产物对血管紧张素转化酶 (ACE)的活性有很强的抑制作用。采用凝胶过滤色谱SephadexG 15和反相高效液相色谱 (RP HPLC)对水解度为 2 0 %的酶解产物进行分离纯化 ,利用质谱鉴定其中一种ACE抑制剂是肽 ,其结构为Gly Tyr。     

苯基荧光酮光度法测定·OH

建立了一种新的测定Fenton反应所产生的羟自由基的方法 ,苯基荧光酮 (Phenylfluorone ,简称本芴酮 )与Fenton试剂作用后 ,使其荧光大大降低 ,其最大激发波长和发射波长分别为 50 0nm和 42 0nm ,基于苯基荧光酮在反应前后的荧光变化 ,即可间接地测定羟自由基的产生量。同时 ,通过清除率实验反证了该方法的可靠性 ,利用顺磁共振法测定苯基荧光酮加入前后的波谱变化来进一步证实该方法的正确性。化学测定过程均在国产仪器下完成 ,具有较高的灵敏度。可推广为一种作为寻找羟自由基清除剂的方法 ,也可作为医学上部分药品性能检验的一种方法     

[Co(2,3-tri)(amp)Cl][ZnCl4]体系中部分几何经式异构体的结构测定

利用单晶X-射线衍射分析了[Co(2,3-tri)(amp)Cl][ZnCl4](2,3-tri=N-(2-Aminoethvl)-1,3-propanediamine;amp=2-(Aminomethyl)pyridine)体系中的一异构体(m3-[Co(2,3-tri)(amp)Cl][ZnCl4]@2.5H2O)结构,用二维核磁共振DQCOSY和NOESY技术联合解析了另两个异构体(m2-[Co(2,3-tri)(amp)C1][ZnCl4]及m4-[Co(2,3-tri)(amp)Cl]][ZnCl4])在溶液中的结构.结构解析显示它们为该体系的三个几何经式异构体.解析的晶体结构属中心对称的空间群,表明它是外消旋的对映体.     

Ni-B/TiO_2 Amorphous Catalyst Used in Heavy Arenes of Petrochemicals Hydrogenation

The various distillation of petroleum contains arenes. For environmental protection, the hydrogenation of arenes becomes important. The amorphous alloy is a new class of material with special catalytic properties for reduction arenes1-4. In this paper, we prepared the Ni-B/TiO2 and Ni-B/Al2O3 amorphous catalysts by impregnation and reduction by KBH4 solution. Their catalytic activities for hydrogenation arenes were tested by the hydrogenation of 1,3,5-trimethylbenzene (TMB) in the co…