含R_2dtc配体Mo-Cu化合物的动态~(95)Mo NMR

本实验利用动态~(95)Mo NMR监测Mo-Cu系列化合物的形成过程,对反应CuCl+NaR_2dtc+MoO_nS,摩尔比3:3:1,溶剂为DMF;R=Et,n=0(Ⅰ);R=Me,n=0(Ⅱ);R=Et,n=2(Ⅲ)进行了研究,观察到具有不同簇骼的多种中间产物的存在及随反应进程相互转化等现象。     

硫酸根阴离子对HPMBP及TOA协同萃取镨(Ⅲ)及钕(Ⅲ)的影晌

本文研究了硫酸根阴离子对1-苯基-3-甲基-4-苯甲酰基吡唑酮-5(HPMBP,HL)及三辛胺(TOA)协同萃取镨(Ⅲ)及钕(Ⅲ)的影响。发现在SO_4~(2-)体系中协萃机理为:(LnL_3)_o+(HTOAL)_o(HTOA~+LuL_4~-)_o及(HLnL_4)_o+(TOA)_o(HTOA~+LnL_4~-)_o式中Ln~(3+)=Pr~(3+),下标“o”指示有机相中物种,无下标指示水相中物种。固体萃合物的红外光谱及元素分析数据确证了上述机理。     

载波钝化和钼酸盐后处理对不锈钢钝化膜性能的影响

一般认为交流电对金属的腐蚀过程具有加速作用,但我们发现,在直流电位基础上叠加适当波形、幅值和频率的交流电对不锈钢进行载波钝化,尔后再进行适当后处理可使钝化膜的稳定性提高,我们曾就不经后处理的载波钝化过程进行过探讨,本文着重探讨钼酸盐后处理对载波钝化膜表面状态和化学稳定性改善的作用机理。     

Synthesis,characterization and interaction of mixed polypyridyl ruthenium(II) complexes with calf thymus DNA

New mixed polypyridyl {HPIP = 2-(2-hydroxyphenyl)imidazo[4,5-f][1,10]phenanthroline, phen = 1,10-phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline, dmb = 4,4-dimethyl-2,2-bipyridine} ruthenium(II) complexes [Ru(phen)₂(HPIP)]²⁺, [Ru(dmp)₂(HPIP)]²⁺ and [Ru(dmb)₂(HPIP)]²⁺ were synthesized and characterized by elemental analyses ¹H-n.m.r., u.v.–vis. spectroscopy and cyclic voltammetry. Their DNA-binding properties were demonstrated by absorption, luminescence titrations, steady-state emission quenching and viscosity measurements. The results suggested that all the examined complexes bind with CT-DNA intercalatively. Methyl groups substituted at the 4,4-positions of bpy has no obvious effect on its DNA binding, whereas substituents at the 2- and 9-positions of phen have an impressive effect on its DNA-binding, as revealed by the decreased binding affinity.     

Simultaneous determination of magnesium lithospermate B, rosmarinic acid, and lithospermic acid in beagle dog serum by liquid chromatography/tandem mass spectrometry

A rapid, sensitive and specific isocratic liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was developed for the simultaneous quantitative determination of magnesium lithospermate B (MLB), rosmarinic acid (RA), and lithospermic acid (LA) in beagle dog serum, with silibinin as internal standard. The serum samples were treated by liquid-liquid extraction and analyzed using LC/MS/MS with a TurboIonSpray source. A short run-time (3 min) fulfilled the need for monitoring serum levels of MLB, RA, and LA in large-scale studies. The calibration curves for MLB, RA, and LA were linear over the ranges 8-2048, 4-1024, and 4-1024 ng/mL, respectively, with coefficients of correlation >0.999. The intra- and inter-day precision (CV) of analysis was <10%, and accuracy ranged from 90-104%. This quantitation method was successfully applied to a pharmacokinetic study of salvianolate administrated by intravenous infusion with dosage of 6 mg/kg in beagle dogs.     

希土脯氨酸配合物的合成和性质研究

通过希土氯化物与L-脯氨酸反应,制得了四种新的希土脯氨酸固体配合物。其通式为:Ln(prol)Cl₃·nH₂O(Ln=Y、La、Sm和Er).用化学分析、电导测定、热重分析、差热分析、红外光谱和核磁共振氢谱,确定了产物的组成,讨论了金属-配体的化学键性质。     

铁－铜－锰氧化物／海泡石催化剂对苯羟基化为苯酚的催化作用

铁－铜－锰氧化物／海泡石催化剂对苯羟基化为苯酚的催化作用曹声春，黄孟光，李克，杜兴军（湖南大学化工系，长沙４１００８２）关键词氧化铁，氧化钢，二氧化锰，海泡石，负载型催化剂，苯，羟基化，苯酚由苯合成苯酚的现行方法存在着反应步骤多，工艺过程复杂，总转化...     

共轭亚麻酸的制备、表征和生物活性研究进展

近年来的研究发现共轭亚麻酸(CLN)具有多种非常有益的生理功能,已成为化学家、药理学家、营养学家争相研究的热点。本文就CLN的制备、表征、分离分析以及生物活性等方面,对国内外的研究进行了综述。CLN的制备包括化学法、生物法和天然产物提取法三大类。CLN的表征方法主要有紫外光谱、红外光谱、核磁共振等方法,以及采用气相色谱法(GC)、高效液相色谱法(HPLC)和毛细管电泳法(CE)等方法对合成的CLN混合物进行分离分析。CLN的生物活性主要有抗癌、降血脂、减肥、抗致癌等。     

Cl/Ag体系研究 Ⅱ.Cl吸附引起的表面结构变化

运用LEED,UPS和HREELS等表面技术研究了氯吸附至(c)阶段的Ag(111)表面结构.结果表明,表面上有三维的AgCl(111)生成,其生长按修正的Stranski-Krastanov模式进行.伴随着AgCI(111)生长的同时,表面上产生缺陷.这种缺陷只有在氯吸附至(c)阶段时表面上形成三维AgCI的过程中才能产生,它一旦在表面上形成后,表面上氯的存在与否对其不产生影响.本文提出了一个(c)阶段时的Cl/Ag(111)体系的结构模型.     

四川省德阳地区泥炭资源的表征及质量评估

本文报导了对四川省德阳地区八种不同来源的泥炭进行全面分析的结果,并与黑龙江省腐值土及山西褐煤进行比较。结果表明,四川省德阳地区泥炭的腐植酸含量大都在20—30%之间,属于中腐酸泥炭,有机质含量在40—50%之间,属于中有机质炭。对从上述八种泥炭中提取的腐植酸进行表征,平均分子量为327.78,其结构是由C、N、H、O、S等元素组成,含有-COOH、-NH、-OH基的结构比较复杂的芳香有机化合物。