卟啉化合物的研究——ⅩⅤ.双卟啉的合成及其与钴离子的络合反应

将双卟啉化合物作为“合成反应中心”是人工光合作用研究中很活跃的一个领域。困难的是,人们还不知道怎样排布两个卟啉环,分子才具有最有效传递电子和能量的构象。本文按下列反应合成了一个以柔性链连接的双卟啉化合物(3),以期当分子中络合金属后,籍助两个金属的协同作用和链的可塑性,达到在光反应过程中取最佳构象的目的(见图1)。化合物(1)按文献[1]合成。2、3尚未见报道,它们的结构,经元素分析及波谱分析确认。本文还研究了3与Co~(2 )络合反应的动力     

氨基氮杂环荧光分子改性苯乙烯马来酸酐共聚物的研究

荧光高分子材料 ,由于其独特光学性质 ,成为功能高分子研究热点[1～ 3 ] .一般而言 ,荧光聚合物的合成有两种方法 ,一是首先合成荧光单体 ,然后与其他适宜单体聚合 ,得到荧光聚合物 ,然而荧光单体结构复杂 ,提纯困难 ,难以获得高分子量、成膜性能好的聚合物[4] ;另一种方法是通过官能团的反应 ,用荧光物质对聚合物进行化学改性来制备[5,6] .苯乙烯 马来酸酐共聚物 (ＳＭＡ)是一类成本低廉 ,性能良好的商品化聚合物材料 ,主链中含有具有反应性能的酸酐基团 ,这就使通过化学改性制备荧光聚合物成为可能 .本文通过 2 氨基苯并咪唑 ( 1 ) ,4 …     

反相高效液相色谱法测定强化奶粉中β-胡萝卜素含量

采用碱皂化石油醚提取,Kromasil C18柱分离,以甲醇∶氯仿=75∶25等度淋洗,二极管阵列检测器检测,测定了强化奶粉中β-胡萝卜素含量.对最佳皂化用碱量、皂化时间、α、β-胡罗卜素及β-胡罗卜素异构体分离条件进行了探索.该方法回收率为91.6%~96.3%,其标准偏差、变异系数分别为1.64%及1.76%.方法简便、快速,精密度及准确度在允许范围内,适用于奶粉中β-胡罗卜素的测定.     

颗粒性甲烷单加氧酶的电子供体研究

从甲基弯菌M ethylosinus trichosporium IMV3011的膜中分离出颗粒性甲烷单加氧酶（Particulate MMO,Pmmo）t和NADH脱氢酶，只有当两者同时存在，并添加去垢剂解离膜组分时，NDAH才能为pMMO提供还原当量，对苯二酚能够在整细胞和膜水平代替NADH作为PMMO的电子供体，对于纯化的PMMO，对苯二分配仍是有效的电子供体，而NADH却是无效的电子供体。在NADH脱氢酶存在下，NADH可将对苯醌还原为对苯二酚，纯化过程中，采用对苯二酚作为PMMO活性分析时的电子供体，不必共纯化NADH脱氢酶，且有利于对PMMO活性中心进行深入研究。     

化合物Cs5EuCl8·14H2O和Cs2EuCl5·4H2O的制备和荧光性

The two new compounds Cs₅EuCl₈·14H₅O(5∶1 type) and Cs₂EuCl₅·4H₂O(2∶1 type) were found and syn-thesized from CsCl-EuCl₃-11%HCl-H₂O quaternary systems by phase equilibrium method, and were characterized and measured by ultra-violet absorption spectrometry and fluorescence spectrum. The results show that upconversion spectrum exhibit at 590nm and 610nm exited at 790nm, and the upconversion intensity increases with the EuCl₃ ratio increasing in CsCl.     

萘降解菌LHJ38生物合成靛蓝的研究

萘降解菌LHJ38在金属盐培养基中加入水杨酸钠诱导培养后能提高其生物合成靛蓝的能力,在LB培养基中加入水杨酸钠反而抑制了其生物合成靛蓝的能力.与LHJ38最适生长pH值不同,LHJ38生物合成靛蓝的最佳pH值范围是8.45—9.45,在pH为8.95的情况下生物合成靛蓝能力是其在pH值为6.95的情况下的两倍.     

测定水性聚氨酯树脂平均相对分子质量及其分布的高效凝胶渗透色谱法

选用HP PL gel MIXED-B柱双柱串联，四氢呋喃作流动相，紫外吸收检测器测定了水性聚氨酯树脂的平均相对分子质量及其分布；通过一系列的条件试验，确定了最佳的凝胶色谱（GPC）条件，结果令人满意；该研究有助于了解水性聚氨酯树脂性能，有效地指导工艺生产和基础研究。     

Structure and Two-photon Excited Blue Fluorescence of an Asymmetrical Substituted Stilbene

In common fluorescence process, molecular excitation is caused by the absorption of at least a single photon with shorter wavelength. When certain laser is used as the pump source, some compounds can be excited by simultaneous absorption of at least two photons and then the emission of up-converted fluorescence may occur. This process is called two-photon excited fluorescence (TPEF)1,2. Because of several advantages of TPEF, including intrinsic high three-dimensional resolution and the p…     

Molecular Recognition of Bases and Nucleosides by Mono－substituted Mononuclear Complexes of 1,4,7,10－Tetraaza－cyclododecane

The mononuclear macrocyclic polyamine metal complexes 5a-5e have been shown to form stable 1 : 1 complexes with bases and nucleosides. Their binding constants (K) were determined by UV-visible spectrometric titration. The results show that recognition ability of the complexes 5a--5e for uracil, U (Uridine), dT (Thymidine) is higher than that for the other bases or nucleosides (such as Cytidine, Guanosine, Adenosine). The metal ion also plays an important role for the recognition ability of complexes.     

Study on the Thermodynamic Stabilities of Te-Substituted Di-n-butyltellurium Ylide

SincethediscoveryofphosphoniumylidebyWittig',carbanionsstabilizedbyadjacentfifthorsixthgrouponiumionshavebeendevelopedasavaluablereactiveintermediate.However,despitethegreateffortsinylidechemistryinthepastfewdecades',relativelylittleisknownaboutthethermodynamicstabilitiesofylidecarbanions.Itiswellknowthatthequantitativemeasuresofthecarbanionstabilityhavecontributedagreatdealtothedevelopmentoforganicchemistry,thereforeitshouldbeexpectedthattheknowledgeaboutylidestabilitywillalsoprovidavaluableg…