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Synthesis and single crystal structure analysis of three novel benzoylthiourea derivatives
Thiourea derivatives benzoylthioureas single crystal X-ray structures
2010/4/8
N,N-dimethyl-N' -(2-methylbenzoyl)thiourea, C11H14N2SO (HL1), N,N-dibutyl-N' -(2-methylben\-zoyl)thiourea, C{17}H{26}N2SO (HL2), and N,N-dihexyl-N' -(2-methylbenzoyl) thiourea, C{21}H{34}N2SO (HL3) we...
介孔空心球状WC微球结构与晶相形成机理(Structure and Crystal Phase Formation Mechanisms of Hollow Global Tungsten Carbide (WC) Microsphere with Mesoporosity)
介孔 空心球状 碳化钨 微球 形成机理
2010/8/18
采用喷雾干燥微球化处理-气固反应法制备了介孔空心球状WC微球,应用扫描电子显微镜(SEM)对微球的形貌变化进行了表征。结果表明,介孔空心球状结构是逐步形成的。其中,空心球状结构形成于前驱体微球化处理过程中,介孔结构形成于空心微球还原碳化过程中。在与样品制备工艺条件相同的情况下,采用原位X射线衍射技术(in situ XRD)对样品的晶相演变规律进行了监测。结果表明,样品在CO/CO2气氛中进行还...
卡托普利插层锌铝水滑石的超分子结构、热稳定性及缓释性能研究(Supramolecular Structure, Thermal Property and Sustained-release of Captopril-intercalated Zn/Al-layered Double Hydroxides)
水滑石 卡托普利 超分子结构 热稳定性 缓释
2010/8/18
采用共沉淀及离子交换的方法将高血压类药物卡托普利(Cpl)插入到Zn/Al-NO3-LDHs层间,借助XRD、FTIR、UV-Vis、TG-DTA和ICP等手段对样品进行表征。结果表明,Cpl阴离子可取代层间的NO3-,组装得到晶体结构良好的Cpl-LDHs。XRD结果表明得到的Cpl-LDHs的层间距为1.955~2.053 nm,并与根据PM3半经验分子轨道法优化计算得到的Cpl-三维尺寸进...
pH值和钙离子对尖吻蝮蛇抗血小板凝集素二级结构的影响(Effects of pH Value and Ca2+ Ion on the Secondary Structure of Agkisacutacin from Agkistrodon Acutus Venom)
抗血小板凝集素 二级结构 圆二色谱 拉曼光谱 红外光谱
2010/8/25
尖吻蝮蛇毒中抗血小板凝集素是凝血因子IX/凝血因子X结合蛋白,它具有抗凝血和抑制血小板凝集双重活性。用红外光谱、拉曼光谱和CD谱研究了抗血小板凝集素的二级结构以及pH值和钙离子对其二级结构的影响。用CD谱测得,在水溶液中,抗血小板凝集素的主要骨架构象为β-折叠(26.3%)和α-螺旋(19.6%)结构。拉曼光谱显示,在粉末状态,其α-螺旋含量显著降低。CD谱还表明,抗血小板凝集素在pH值3.0~1...
研究了pH值交替变动、水热处理以及表面活性剂对活性氧化铝孔结构的影响。实验结果表明:pH值交替变动可以制备出结晶度高,晶粒大且均匀的拟薄水铝石;水热处理有利于氧化铝结构内铝原子迁移,促进晶粒进一步增长;而表面活性剂能够插入拟薄水铝石层间,减少焙烧过程中层间坍塌和毛细孔收缩,从而有效调控氧化铝孔结构。其中pH值交替变动和水热处理使氧化铝微孔分布向大孔方向迁移,比表面降低;加入表面活性剂使氧化铝微孔...
Synthesis, Characterization, Crystal Structure and Thermal Behavior of N'-(4-chlorobenzoyl)-N,N-di-n-butylthiourea and Its Nickel Complex
Thioureas synthesis X-ray structure thermal behavior benzoylthiourea
2010/4/19
We report the synthesis, structural characterization and thermal behavior of N'-(4-chlorobenzoyl)-N,N-di-n-butylthiourea (HL) and its nickel complex (NiL2). Some physical properties of the prepared co...
二元类水滑石层板组成、结构与性能的理论研究(Theoretical Studies on Layer Composition, Structure and Properties of Hydrotalcite)
类水滑石 静电势能模型 热稳定性
2010/8/24
采用晶体学理论建立二元类水滑石(LDHs)微观结构模型与静电势能模型,将层板金属离子间距、层板电荷密度、层间阴离子间距等微观结构参数定量化,并将层间阴离子的静电势能表示成层板金属离子半径和物质的量之比、插层阴离子尺寸和电荷的函数。研究结果表明:LDHs层板金属离子间距应用离子紧密堆积来估算和孔径按阴离子平面六方点阵分布来计算是可行的;调变层板金属离子种类与物质的量之比影响层间阴离子的稳定性,势能计...
pH值和金属离子对尖吻蝮蛇抗凝血因子Ⅱ二级结构的影响(The Effects of pH and Metal Ions on the Secondary Structure of Anticogulation Factor Ⅱ Studed by CD Spectroscopy)
抗凝血因子Ⅱ 酸度(pH) 二级结构 圆二色谱
2010/8/25
圆二色谱(CD谱)测量表明,尖吻蝮蛇抗凝血因子Ⅱ(ACF Ⅱ)与抗凝血因子Ⅰ(ACF Ⅰ)的二级结构十分相似,它们的主要骨架构象都为反平行β-折叠和α-螺旋结构。pH值对天然ACF Ⅱ的构象有一定的影响,pH值从3到10增大时,α-螺旋含量逐渐减少,反平行β-折叠含量逐渐增大。钙和其他二价金属离子对ACF Ⅱ的骨架结构没有明显影响。三价稀土离子使ACF Ⅱ的α-螺旋含量升高,同时降低其β-转角和β...
Defect Structure and Properties of Sr-Doped La Cr O3-d
Defect modeling LSC Perovskite Nonstoichiometry Conductivity
2010/4/20
A defect chemical model for the behavior of acceptor-doped LaCrO3 as a function of oxygen pressure is proposed. This is considered within the regime that corresponds to oxygen deficit oxygen. The math...
Formation of the Monolithic Silica Gel Column with Bimodal Pore Structure
Monolithic silica gel column Phase separation Sol-gel transition Pore structure
2010/4/20
A biporous monolithic silica gel column possessing both micrometer sized through-pores and nanometer sized mesopores located in the silica skeletons was prepared and the high concentration porogen (e....
Application of Quantitative Structure-Retention Relationships (QSRR) to a Set of Organic Bromo and Nitrile Derivatives
QSRR - Quantum mechanical molecular descriptors - Retention Index - Bromo and Nitrile Derivatives
2010/4/22
The retention times are studied for two sets of 1-bromo-2-aryiloxyetanes and 3- aryloxypropiononitriles derivatives by means of Quantitative Structure-Retention Relationships (QSRR}). Five quantum mec...