P507萃取树脂色谱分离—ICP／AES法测定高纯La2O3中Ce,Pr,Nd和Sm

本文采用我院合成的P_(507)萃取树脂,在50℃恒温下,用0.055mol/L HCI-1 mol/L NH_4Cl淋洗体系,满意地解决了La与Ce、Pr、Nd和Sm的定量分离,用ICP-AES法测定了经分离富集的痕量稀土杂质元素。     

On a generalization of principal weak flatness property

In this article a generalization of principal weak flatness of acts is defined. Using this new property the characterization of some new classes of monoids are investigated. Furthermore, many known results are generalized.     

TopSpin核磁共振软件中集成的DOSY采集／处理模块DOSYmTM

Bruker TopSpinTM核磁共振软件中集成的DOSY数据采集和处理模块DOSYm^TM,可以方便简单地进行DOSY实验的在线数据采集与处理,并已很好地应用于复杂混合物的定性和定量分析,如天然混合物、石油产品、医药产品、食品工业及质量控制等领域．本文介绍了DOSY实验的原理,数据采集和处理的方法及DOSYm^TM模块的应用．     

用光学记录速度干涉仪测量自由面速度

 建立了一套光学记录速度干涉仪系统(ORVIS),用于测量强激光产生的冲击波状态方程中的自由面速度。该光学记录速度干涉仪系统的时间分辨率为179 ps,可以测量自由面速度随时间变化的整个过程。在天光KrF高功率准分子激光装置上进行激光打靶实验,激光波长248.4 nm,脉冲宽度25 ns,最大输出能量158 J。在激光功率密度为6.24×10¹¹W·cm^-2的条件下,测得厚20 μm铁膜的自由面速度可达3.86 km/s;在激光功率密度为7.28×10¹¹W·cm^-2条件下,100 μm铝膜（靶前有100 μm的CH膜作为烧蚀层）的自由面速度可以达到2.87 km/s。     

重油催化裂解多产乙烯丙烯催化剂的研究

采用半合成法制备了不同金属改性的ZSM-5分子筛催化剂,以大庆VGO为原料,在固定床微型反应装置上对不同金属改性催化剂进行裂解生产低碳烯烃效果的评价,筛选出生产乙烯、丙烯性能较好的银+镧双金属改性催化剂,采用喷雾干燥的方法成型,并在800℃、100%水蒸气下老化处理4h。该催化剂在两段提升管实验装置上,以大庆AR为原料的评价结果表明,乙烯和丙烯收率可分别达到9.5%和24.9%;若考虑C4组分回炼,乙烯和丙烯收率可分别达到13.0%和29.9%。     

动物组织中阿莫西林残留的液相色谱分析方法研究

建立了反相高效液相色谱分析鸡肉、猪肉、猪皮、猪脂肪等动物组织样品中阿莫西林残留量的方法。对4种动物组织样品采用磷酸盐缓冲溶液提取、三氯乙酸沉淀蛋白、固相萃取净化和富集、1,2,4-三唑-氯化汞衍生化。研究了样品在C18柱上的保留行为和阿莫西林的衍生化条件。衍生物采用高效液相色谱法分离,外标法定量分析,标准曲线的线性相关系数为0.9997,线性范围为8.6-860 μg/L。动物组织样品中阿莫西林的加标回收率为70.9%-86.8%,相对标准偏差为3.2%-16.4%,最低检出限低于10 μg/kg。该分析     

Hydrostable coordination polymers of a methyl-functionalized 4,4′-bipyridine ligand: structure,stability, magnetic and luminescent properties

The reactions of aromatic dicarboxylic acids and methyl-functionalized 4,4′-bipyridine ligands with metal salts under hydrothermal conditions generated four structurally diverse cobalt(II), zinc(II) and cadmium(II) coordination polymers, [Co(CH₃-BDC)(dmbpy)_0.5] _n (1), [Cd(OH-HBDC)₂(dmbpy)] _n (2), [Zn(NDC)(dmbpy)] _n , (3) and {[Cd(DBA)(dmbpy)_0.5]·2H₂O} _n (4) (CH₃–H₂BDC = 5-methylisophthalic acid, OH–H₂BDC = 5-hydroxyisophthalic acid, H₂NDC = 1,4-naphthalenedicarboxylic acid, H₂DBA = 4,4′-methylenedibenzoic acid, dmbpy = 2,2′-dimethyl-4,4′-bipyridine). All four complexes have been structurally characterized by X-ray crystallography. Complex 1 shows a 3D jsm topology structure with two 1D channels parallel to the a and b axes. Complex 2 has a zigzag chain in which the OH-HBDC ligands point alternately up and down. Complexes 3 and 4 show 2D (4,4) networks when the dinuclear metal centers and their ligands are regarded as nodes and linkers, respectively. Complex 3 also shows twofold interpenetration with 1D channels along the b axis. Two nets of complex 4 interlock in parallel, giving rise to a polycatenated layer (2D → 2D). Thermogravimetric and chemical stabilities, magnetic and luminescent properties of these complexes were investigated.     

A Novel Borophosphate Coordination Polymer with Sandwich-type Supramolecular Architecture

A novel borophosphate (Hmel)3{Co2[(mel)2(HPO4)2(PO4)]·H3BO3·H2O} (mel= melamine) has been synthesized under mild solvothermal conditions. The structure of the compound exists a high ordered organic-inorganic sandwich-type supramolecular architecture via metal-coordination, hydrogen bonds and π-π stacking interactions.     

Kinetic modeling of aldehyde adsorption rates on bare and aminopropylsilyl-modified silica gels by ultra-rapid-scanning fourier transform infrared spectrometry

Enhancements of a model capable of precisely defining rates of adsorption in terms of a Langmuir isotherm and determined from infrared and pressure data collected in the millisecond time regime are described in detail. Rates of adsorption are determined for formaldehyde and acetaldehyde exposed to bare and aminopropylsilyl-derivatized silica gel. The model fits the collected data by varying the number of adsorption sites and the adsorption and desorption rate constants and determines the best fit based on the measured IR absorbance, partial pressure, exposure backpressure, number of adsorption sites, and time. The rate of adsorption onto irregular-shaped silica gel was faster than the rate onto the corresponding spherical silica gel. Formaldehyde was adsorbed more efficiently than acetaldehyde on APS silica gel than on bare silica gel, whereas acetaldehyde was adsorbed more efficiently than formaldehyde on underivatized silica, indicating the possibility that formaldehyde is adsorbed through the formation of a Schiff base.     

Synthesis of Hymecromone Derivatives Containing Chiral 1,1''''-Bi-2-naphthyl Moiety for Dual-mode Molecular Switch

Some hymecromone derivatives containing chiral 1,1'-bi-2-naphthyl moiety were synthesized and their photodimerizations were investigated. It was found that fluorescence intensity and optical rotation of the new chiral hymecromone derivatives could be regulated by light. This property has potential significance for developing a new type of dual-mode molecular switch.