本体聚合制备Sm(OPr~i)(TTA)_2/PMMA光致发光材料

合成了(异丙氧基)二(α-噻吩甲酰三氟丙酮基)钐[Sm(OPri)(TTA)2]配合物,并通过本体聚合制备Sm(OPri)(TTA)2/PMMA光致发光材料,采用IR1、H-NMR、XRD、DMTA、FS、ESEM对其进行表征.结果表明,Sm-(OPri)(TTA)2/PMMA在396 nm波长激发下在562、598、644 nm处发射很强的Sm3+离子4G5/2→6H5/2,4G5/2→6H7/2,4G5/2→6H9/2跃迁的特征荧光,其发光强度与Sm(TTA)3/PMMA相当;其储能模量E′、玻璃化温度Tg和粘流温度Tf均比PMMA有所提高;Sm(OPri)3/PMMA形成类似交联结构聚合物,而Sm(OPri)(TTA)2/PMMA为线型无定型结构聚合物.     

Electrooxidation of Hydroxypivalaldehyde in an Undivided Cell

IntroductionHydroxypivalaldehyde(HPAL)has two activefunctional groups,aldehyde and alcohol.The directelectrooxidation of alcohol or aldehyde has been repor-ted,such as the electrooxidations of croton aldehyde,benzaldehyde[1],and benzyl alcohol[2—4].Howev…     

5-氟尿嘧啶-1-乙酸合铜(Ⅱ)的合成及其与DNA的作用

The 5-fluorouracil-1-acetic acid (5FuAA) and its Cu(Ⅱ) complex (5FuAACu) were synthesized and the date for the crystal complex was obtained. The interaction of 5-fluorouracil-1-acetic acid (5FuAA) and its Cu(Ⅱ) complex (5FuAACu) with DNA was also investigated by using spectral, viscometric, electrochemical and agarose gel electrophoresis methods. The results of interaction with DNA suggest that both 5FuAA and 5FuAACu can bind to DNA in a static electricity attraction mode. But the attraction of 5FuAACu is greater than that of 5FuAA.     

无机胶体法制备Pt/C催化剂及其性能表征

采用无机胶体法制备用于质子交换膜燃料电池(PEMFC)的Pt/C催化剂。研究了影响PtO₂胶体生成和稳定性的因素(溶液的pH值、浓度和温度条件等)以及不同还原剂浓度对Pt/C催化剂性能的影响。透射电子显微镜测试结果表明，采用经优化的工艺条件所制备的Pt/C催化剂平均粒径为3 nm，且分散性好、粒度均匀。X-射线衍射分析表明，催化剂中Pt(111)晶面的相对含量较高，有利于加速氧还原反应。单体PEMFC的电压/电流密度曲线测试表明，所制备的Pt/C催化剂具有良好的电化学性能。     

红色磷光喹喔啉铂(II)配合物及其有机电致发光器件的制备

利用2,3-二苯基喹喔啉和氯亚铂酸钾(K2PtCl4)反应,合成了一种新型喹喔啉铂的配合物(DPQ)Pt(acac),通过元素分析,1HNMR测定对配合物结构进行了表征,结果显示得到的是目标化合物.利用紫外光谱和荧光光谱对配合物进行了研究.利用该材料作为磷光染料制备了结构为ITO/NPB(21nm)/NPB∶7%(DPQ)Pt(acac)(17.5nm)/BCP(7nm)/Alq3(21nm)/Mg∶Ag(10∶1)(120nm)/Ag(10nm)的有机电致发光器件(OLED).结果表明,该配合物在442和485nm处存在单重态1MLCT(金属到配体的电荷跃迁)和三重态3MLCT的吸收峰;在632nm处有较强的金属配合物三重态的磷光发射;该器件的启动电压是5.0V,器件的最大亮度为1516cd·m-2,外量子效率为0.66%,流明效率为0.26lm·W-1,是一种红色磷光材料.     

Synthesis and Primary Research on Antitumor Activity of Three New Panaxadiol Fatty Acid Esters

For making use of Ginseng resources that exhibit an antitumor activity and for finding new anticancer drugs,three new fatty acid ester compounds: 3β-acetoxy panaxadiol ( Ⅰ ), 3β-palmitic acid aceloxy panaxadiol ( Ⅱ ), and 3β-octadecanoic acid aceloxy panaxadiol( Ⅰ , Ⅱ , and Ⅲ ) were synthesized with panaxadiol, diacetyl oxide, palmityl chloride and stearyl chloride, and their structures were determined via MS, 13C NMR, IR, TLC, and so on. The molar yields of the three compounds are 75.14%, 79. 08%, and 72. 57%, respectively. Meanwhile, the antitumor activity of the three new panaxadiol fatty acid ester derivatives and panaxadiol was compared by using the method of MTT. Tumor cell used was Vero cell line. Positive control was 5-FU, blank was an RPMI1640 culture medium, negative control was an RPMI1640 culture medium and the solvent for drugs to be tested. Compound Ⅰ has the strongest antitumor activity followed by panaxadiol; compounds Ⅱ and Ⅲ have similar and weakest antitumor activities.Furthermore, the antitumor activities of the panaxadiol fatty acid ester derivatives show positive correlation with the concentration of the test group, but show no relationship with the molecular weight of fatty acid. The methods that are used to synthesize the three compounds with high yields and strong antitumor activities are simple and show a great potential for meeting the needs of industrial manufacture of these drugs.     

汞(II)与牛血红蛋白相互作用的研究

本文采用紫外光谱(UV/VIS)、荧光光谱和圆二色谱等方法,对汞(II)与牛血红蛋白(BHb)的相互作用进行了研究。结果表明:Hg2 处理导致BHb紫外吸收的增加,出现LMCT带,并随Hg2 浓度的增加LMCT带强度显著增强。BHb分子中Soret带的吸收随着Hg2 作用时间的增加而持续降低,表明Hg2 使部分血红素辅基从BHb中脱离出来。蛋白内源荧光光谱显示,Hg2 与BHb的结合会影响蛋白质的三级结构和四级结构。远紫外圆二色谱表明,Hg2 处理会导致BHb蛋白的α-螺旋含量减少。     

富含纤维素类农作物秆与丙烯酸接枝共聚制备高倍率吸水树脂

用棉花秆、麦秆和玉米秆等富含纤维素类农作物秆与丙烯酸接枝共聚制备了高倍率的吸水树脂. 研究了不同水质(去离子水、自来水及雨水)对接枝产物吸水性能的影响. 采用棉花秆、麦秆、玉米秆与丙烯酸的接枝产物对去离子水的吸水倍率分别为930, 790和630 g/g, 对自来水的吸水倍率分别为670, 350和250 g/g, 用玉米秆/地瓜淀粉混合物制备的接枝产物对雨水的吸水倍率为540 g/g. 为棉花秆、 麦秆及玉米秆等富含纤维素的农作物秆的深加工与应用开辟了一条途径.     

可控降解超支化聚碳硅氮烷的合成与表征

通过锂化四甲基二乙烯基二硅氮烷分别与甲基氢二氯硅烷和二甲基氢氯硅烷的亲核取代反应合成了AB4和AB2型单体AB4M和AB2M,两种单体通过Karstedt催化剂催化的硅氢加成反应分别生成聚碳硅氮烷PAB4M和PAB2M.单体和聚合物的结构通过FT-IR、1H-NMR、13C-NMR、29Si-NMR和体积排除色谱-多角度激光光散射联用(SEC-MALLS)技术进行了表征,结果表明,单体的结构与设计结构相符合;单体聚合时主要以α-硅氢加成方式为主;聚合物具有超支化结构并由N(Si—C)3链节和大量端基双键组成.PAB4M和PAB2M的重均分子量分别为7800和5860g/mol,分子量分布系数分别为2·54和2·31·对PAB4M稳定性的初步研究表明,该聚合物对氯硅烷和在中性条件下对水稳定,但在HCl水溶液中可以降解,且通过控制HCl浓度可以调节其降解速度,从而实现对其控制降解.     

一种新型壳聚糖固载环糊精分子的合成

以β-环糊精(-βCD)为原料,经过对甲苯磺酰化、胺化制得胺化环糊精(3);以壳聚糖为原料,制备O-羧甲基壳聚糖(4);4的羧基与3的氨基在催化剂EDC{1-[3-(D im ethyl am ino)propyl]-3-ethylcarbod iim ide hydrochlo-ride}作用下水相反应,制得了一种新型壳聚糖固载环糊精分子(1),总收率29%,-βCD表观固载量9.5%。1的结构经1H NMR和IR表征。