甲基百里香酚蓝与铅的络合显色反应及其应用

目前,在化学分析方面所做的许多条件试验主要是利用全面试验法,而条件试验的全面试验法所做试验次数太多,时间长,浪费大量的药品,增加了试验费用,并且有时缺乏准确性,而利用正交试验设计进行光度试验可以克服这些缺点。为此,本法用正交试验法对甲基百里香酚蓝测定铅的光度法进行试验。光度法测定铅已有报道[1-6],但是用甲基百里香酚蓝(MTB)测定铅的光度法报道较少,本文对影响光度法测定微量铅的酸度、显色剂MTB用量、掩蔽剂(NH4F和邻二氮菲)用量、乙醇用量及稳定时间等条件进行了正交试验设计,利用了少量试验得到了比较理想的试验条件。…     

目标因子分光光度法同时测定中成药复方五味子中三项活性成分

将目标因子分光光度法应用于五味子提取液中五味子甲素、五味子乙素、五味子醇甲等三项活性成分的同时测定,介绍了基本原理和具体的分析步骤,运用计算机VC 语言对试验数据进行回归分析。试验结果表明,目标因子分光光度法对样品各组分的平均回收率在98.9%-106.7%之间,样品不经分离即可同时测定。     

3,4-二氢-3-甲基-4-氧代咪唑[5,1-d]并[1,2,3,5]四嗪-8-甲酸苯磺酰基呋咱氮氧基酯的合成

以3,4-二氢-3-甲基-4-氧代咪唑[5,1-d]并[1,2,3,5]四嗪-8-甲酰胺和苯磺酰基呋咱氮氧化物为原料,通过肖滕-鲍曼法合成了5种新的咪唑四嗪衍生物——3,4-二氢-3-甲基-4-氧代咪唑[5,1-d]并[1,2,3,5]四嗪-8-甲酸苯磺酰基呋咱氮氧基酯,其结构经1H NMR,IR,MS和元素分析确证。     

α-羟基-1-萘乙酸的合成与拆分

以1-萘甲醛为原料,三乙基苄基氯化铵为相转移催化剂,合成了消旋的α-羟基-1-萘乙酸[(±)-2],收率51.4%.以光学活性(R)-( )-N-苄基苯乙胺为拆分剂,拆分(±)-2得(-)-2,拆分率45.5%.     

FCC硫转移剂MgAlCuFe复合氧化物的结构与性能:金属盐前体的影响

分别以硝酸盐、盐酸盐和硫酸盐为金属盐前体,采用共沉淀法合成了MgAlCuFe类水滑石前驱体,经过700℃焙烧6h后,制得三种新型FCC硫转移剂.运用X射线衍射、热重、氮气吸附和红外光谱对这三种硫转移剂的结构和性能进行了表征,并采用改装的WRP-3热重天平评价了其氧化吸硫和还原脱硫的性能.结果表明,三种金属盐均可得到结构规整的类水滑石前驱体,经过焙烧后得到复合氧化物MgAlCuFe.与采用盐酸盐和硫酸盐作前体相比,由硝酸盐制得的硫转移剂具有较大的比表面积,其饱和吸附硫容和氧化吸硫速率均较高,6min可达到1.54g/g的饱和吸附能力,同时具有较强的还原脱硫能力.     

有毒难降解有机污染物的光催化降解

有毒难降解有机污染物的光催化降解在原理、过程和效率等方面仍然存在着巨大的挑战,特别是光催化剂的构效关系、可见光的利用、分子氧的活化和污染物分子矿化分解的机理仍然是今后的研究热点.本文就近年来在半导体光催化和负载型铁离子光催化降解有毒有机污染物的两个重要方面的研究进展进行了评述.     

密度泛函理论在分子磁学中的应用2.混合桥联三核镍配合物自旋交换作用

用密度泛函理论结合对称性破损方法(DFF-BS)研究了混合桥联三核镍配合物的磁交换耦合作用．这类化合物是由三唑和异硫氰酸根桥联形成的混合桥配合物．计算表明,在标题化合物中,三唑桥传递反铁磁耦合作用,而异硫氰酸根桥传递铁磁耦合作用;并且,随着异硫氰酸根取代三唑桥的数目增加,配合物的铁磁作用增强,在一定意义上说明了混合桥磁耦合作用的加合性．Mulliken自旋布居分析表明,无论是三唑桥还是异硫氰酸根桥,它们的磁交换作用机理都是磁中心的自旋离域．分子磁轨道分析显示,对于三唑桥,在局域磁轨道之间存在着强的轨道作用,导致了反铁磁耦合;对于异硫氰酸根桥,局域磁轨道之间弱的相互作用,表现了铁磁耦合作用．对标题化合物的研究说明了DFF-BS方法可用于三核体系磁交换作用的研究．     

Syntheses, Structures and Coordination Behavior of Central Hydroxyl Group Containing Polydentate Ligands

Proteins containing dinuclear Cu (II), Zn (II) centers play paramount roles in biology1. As mimetic of metal-dependent esterase, dinuclear Cu (II) and Zn (II) complexes have received a great deal of attentions2~6. They are of interest in the field of biomimetic chemistry to provide an improved understanding of the function of the biological sites and as potential catalysts for substrate oxidations. Schiff base type polydentate ligands which contain centeral hydroxyl group have been wid…     

Thermochemical Study of Coordination of Holmium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate

The complex of holmium chloride hydrate with diethylammonium diethyldithiocarbamate (D-DDC) was synthesized via mixing their solutions in absolute alcohol under a dry N2 atmosphere. The elemental and chemical analyses show that the complex has the general formula Et2NH2[Ho(S2CNEt2)4]. It was also characterized by IR spectroscopy. The enthalpies of the dissolution of holmium chloride hydrate and D-DDC in absolute alcohol at 298.15 K o and the enthalpy changes of liquid-phase reactions of the formation of Et2NH2[Ho(S2CNEt2)4] at different temperatures were determined by microcalorimetry. On the basis of experimental and calculated results, three thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy), the rate constant and three kinetic parameters (the apparent activation energy, the pre-exponential constant and the reaction order) of the liquid-phase reaction of the complex formation were obtained, The enthalpy change of the solid-phase complex formation reaction at 298.15 K was calculated by means of a thermochemical cycle.     

A New Sesquiterpene Lactone from Ainsliaea bonatii

A new sesquiterpene lactone, Ainsliaolide A, was isolated from Ainsliaea bonatii. The structure was determined on the basis of spectral data.