封面文章
化学
来源出版物:SCIENCE CHINA Chemistry, 2015, 58(2):192-209联系邮箱:Yongfang Li,liyf@iccas.ac.cn
封面介绍:The cover image presents the formation pathway of isobutanol from syngas on K-CuLaZrO2catalyst.On page 166, WU et al.demonstrate that the introduction of Cu facilitates the adsorption and activation of H2and CO, which leads to an increase in the amount of C1intermediates, and the results show that the formation of isobutanol is further promoted.
Cu对K-LaZrO2异丁醇合成催化剂的影响
武应全,王思晨,解红娟,等
采用X射线衍射(XRD)、程序升温脱附(TPD)、X射线光电子能谱(XPS)、傅里叶变换红外(FTIR)光谱技术及富集法考察了K-LaZrO2和K-CuLaZrO2催化剂结构、CO和H2在锆基催化剂上的吸附行为及异丁醇合成活性的影响.结果表明,催化剂添加Cu后,与Zr形成较好的固溶体,促进了CuO的分散,且抑制了ZrO2结晶,增强Cu-Zr相互作用,提高了催化活性.CO-TPD结果显示,引入Cu后,催化剂表面CO吸附量明显增加,有利于碳链增长;H2-TPD结果显示,与活性相关的低温脱附氢量也明显增加.另外,FTIR及富集法结果发现,Cu的引入促进了表面C1物种的形成,增加了表面C1物种含量,促进了碳链增长,明显改善了异丁醇的选择性.在p=10.0 MPa,空速(GHSV)=3000 h-1,T=360℃,V(H2)/V(CO)=1∶1条件下,异丁醇选择性达到48.5%.
氧化铜;锆基催化剂;合成气;异丁醇
来源出版物:物理化学学报, 2015, 31(1):166-172联系邮箱:谭猗生,tan@sxicc.ac.cn
桥头碳上氮杂芳基功能化的双吡唑甲烷与羰基钨反应
丁可,孙遵明,李厚谦,等
摘要:研究了(氮甲基咪唑-2-基)双(3,5-二甲基吡唑)甲烷(L1),2-吡啶基双(3,5-二甲基吡唑)甲烷(L2)及 4-吡啶基双(3,5-二甲基吡唑)甲烷(L3)与羰基钨的反应,合成了一系列以单齿,双齿及三齿氮配位的羰基金属衍生物LW(CO)5(L=L1或L3),LW(CO)4(L=L1, L2或L3)和LW(CO)3(L=L1或L2).核磁,红外及X-射线单晶衍射分析表明这3种配体表现出了可变的配位方式.在LW(CO)5中,当配体为L1时,其倾向于通过咪唑氮与金属配位,而为L3则倾向于利用吡啶氮与金属作用;在LW(CO)4中,配体L1表现为通过咪唑氮和吡唑氮原子配位的[N,N'[双齿配体,而 L2和 L3表现为通过吡唑氮原子配位的[N,N[双齿配体;在LW(CO)3中,L1和L2起着[N,N,N'[三齿螯合配体的作用.
关键词:氮配体;双吡唑甲烷;咪唑;吡啶;钨
来源出版物:无机化学学报, 2015, 31(2):345-352
联系邮箱:唐良富,lftang@nankai.edu.cn
气相色谱-单光子电离飞行时间质谱的联用及在柴油组分表征中的应用
谢园园,花磊,陈平,等
摘要:建立了一种气相色谱(GC)与单光子电离-飞行时间质谱(SPI-TOF MS)联用(GC/SPI-TOF MS)的分析方法.首先,设计了一种双层套管的传输管用于连接 GC与SPI-TOF MS,实现了GC与单光子电离离子源的无缝连接.在此基础上,以n-十五烷标准品和苯/甲苯/二甲苯的标准气为对象,对电离源的重要电压参数进行了优化,得到了纯净的分子离子峰,实现了对各类有机物的快速和准确定性.最后,将该方法用于分析柴油中的挥发性与半挥发性有机物,获得了柴油组分的二维GC×SPI-TOF MS谱图.不需要复杂的谱图解析和数据处理,根据谱图中离子的质荷比(m/z)归纳了柴油的主要成分,包括脂肪烃、芳香烃和含量很低的苯并吡咯等含氮化合物;根据色谱的保留时间将柴油中的同分异构体区分开来.结果表明GC/SPI-TOF MS法是一种简单、有效的分析方法,非常适于柴油及复杂环境样品等的分析表征.
关键词:气相色谱;单光子电离;飞行时间质谱;挥发性与半挥发性有机物;柴油;复杂环境样品
来源出版物:色谱, 2015, 33(2):188-194联系邮箱:李海洋,hli@dicp.ac.cn
封面介绍:Combination of chemotherapy and gene therapy is an effective treatment of tumors which has attracted much attention in the field of tumor treatment.In this study, the effective synergistic antitumor experiment of the combination of cisplatin and survivin siRNA has been successfully carried out in A549DDPcisplatin resistant cells.
聚乙烯亚胺介导siRNA和顺铂协同抗肿瘤治疗
焦自学,陈杰,田华雨,等
摘要:用聚乙烯亚胺(PEI)为载体,介导siRNA(siSurvivin)沉默肿瘤细胞抗凋亡基因survivin,并与抗癌药物(顺铂)进行协同抗肿瘤治疗.凝胶阻滞电泳实验显示,PEI能够对siRNA进行有效复合,在PEI/siRNA质量比为0.4时实现完全阻滞.细胞耐药性实验证明了耐顺铂细胞(A549DDP细胞)的survivin基因过度表达且耐顺铂能力是顺铂敏感细胞(A549细胞)的8倍.RT-PCR实验验证了PEI担载siSurvivin后对survivin基因实现了有效沉默,与顺铂药物共同作用后不影响基因沉默效果.细胞凋亡实验验证了基因与药物协同作用后细胞的凋亡率达到 60.9%,而单独药物或 PEI/siSurvivin复合物分别作用后的细胞凋亡率仅分别为30.2%和19.8%.细胞增殖实验进一步验证了PEI介导siSurvivin与顺铂联合治疗能够实现有效地协同抗肿瘤效果.
关键词:聚乙烯亚胺;Survivin基因;顺铂;协同作用;抗肿瘤
来源出版物:高分子学报, 2015,(1):127-132联系邮箱:田华雨,thy@ciac.ac.cn
封面介绍:In recent years, conjugated polymers have attracted great attention in the application as photovoltaic donor materials in polymer solar cells.Broad absorption, lower energy bandgap,higher hole mobility, relatively lower HOMO energy level and higher solubility are requested for high efficiency conjugated polymer donor materials.Side chain engineering plays a very important role in optimizing the physicochemical properties of the conjugated polymers.In this review article, the authors described recent progress on the side chain engineering of the conjugated polymer donor materials, including the optimization of flexible side chains for balancing the solubility and intermolecular packing(aggregation), electron-withdrawing substituents for lowering HOMO energy levels, and two-dimension-conjugated polymers with conjugated side chains for broadening the absorption and enhancing the hole mobility of the conjugated polymers(see the review by Zhi-Guo Zhang and Yongfang Li on page 192-209).
Side-chain engineering of high-efficiency conjugated polymer photovoltaic materials
Zhi-Guo Zhang, Yongfang Li
In recent years, conjugated polymers have attracted great attention in the application as photovoltaic donor materials in polymer solar cells(PSCs).Broad absorption, lower-energy bandgap, higher hole mobility, relatively lower HOMO energy levels, and higher solubility are important for the conjugated polymer donor materials to achieve high photovoltaic performance.Side-chain engineering plays a very important role in optimizing the physicochemical properties of the conjugated polymers.In this article, we review recent progress on the side-chain engineering of conjugated polymer donor materials, including the optimization of flexible side-chains for balancing solubility and intermolecular packing(aggregation), electron-withdrawing substituents for lowering HOMO energy levels, and two-dimension(2D)-conjugated polymers with conjugated side-chains for broadening absorption and enhancing hole mobility.After the molecular structural optimization by side-chain engineering, the 2D-conjugated polymers based on benzodithiophene units demonstrated the best photovoltaic performance, with power- conversion efficiency higher than 9%.
polymer solar cells; conjugated polymers; side-chain engineering; photovoltaic materials; 2D-conjugated polymers