查询词典 elemental analysis

According to results of cantharidin structure-activity relationships, a series of cantharidin derivatives for the first time were designed, synthesized and characterized by IR, NMR and elemental analysis.

用IR、〓H NMR初步证实了斑蝥素衍生物和DCC生成稳定中间体是使含有芳香羧酸的斑蝥素衍生物与氨基葡萄糖及其衍生物不能进行反应的主要因素。

Thermogravimetric results indicate that the IFR takes part in the decomposition reactions of PP and promotes it to carbonize as the IFR PP undergoes heating and burning. Elemental analysis and infrared spectrum of the burnt residues and swollen char reveal that the phosphorus is m...

元素分析和红外光谱结果表明，IFR－PP受热燃烧时磷主要积聚在燃烧端面并以磷酸及其相应的铵盐存在，它们的形成与IFR受热燃烧时的一系列变化有关，并有助于焦化物的进一步炭化和提高材料的阻燃性能。

Six Pt complexes with chital 1,2 --diaminocyclohexane as carrier ligand were synthesized, their compositions and strctures were characterized by elemental analysis,IR spectroscopy and molecular modeling.

合成了六种以不同手性的1，2-环己二胺(1，2-dach)作为载体配体的铂配合物，用元素分析、红外及分子图形方法对其组成和结构进行了表征。

It is demonstrated that the chiral quaternary ammonium salts catalysts exhibit promising catalytic properties for the substrate. Part III: The synthesis and the characterizing of the macroporous aminomethyl resin-supported cinchona alkaloid complexes and the study on its catalytic properties The part consists of two subsections. the macroporous aminomethyl resin -supported cinchona alkaloid complexes were synthesized by the stuff (cinchonine, quinine and macroporous aminomethyl resin). Their structures were characterized by means of elemental analysis, XPS, TG/DTA; the chiral polymer-supported complexes were first used as catalysts for the reduction of ketones. Their catalytic properties for the reduction processes were investigated. The comparison of the products e.e., the conversion of the substrate among different reduction processes was employed with determined by HPLC. The effects of the time, the temperature, the ratio of catalyst to substrate, reaction solvent as well as the recycle times were also discussed.

第三章聚-4-氨甲基苯乙烯负载金鸡纳碱金属络合物的合成与表征及其不对称催化性能研究本章分为两节，以辛可宁和奎宁及聚-4-氨甲基苯乙烯为原料，合成了4种聚-4-氨甲基苯乙烯负载金鸡纳碱络合物催化剂，并对它们的结构用元素分析、X-射线光电子能谱、TG/DTA等几种测试手段进行了表征；首次将所合成的手性高分子负载的金属络合物用于催化芳香酮不对称还原反应，详细研究了所得的手性高分子负载的金属络合物对不同底物的催化性能，用HPLC等分析手段定量检测了还原过程的底物转化率及其产物对映异构体选择性，并考察了反应时间、反应温度、催化剂和底物投料比、反应溶剂和循环次数对催化性能的影响。

The suitable synthesis conditions of those new products have been studied. The structures of them are affirmed by IR spectroscopy, 1~H NMR,(13)~C NMR and Elemental Analysis;the configurations of them are also analyzed by theoretical calculation of quantum chemistry. Influences of the length of hydrophobic group, the degree of substitution on the solubility, surface activity, emulsifying property, foam property, hygroscopicity and humidity-retaining ability, compatibleness of those new products have been studied in detail.

探讨了各反应产物的适宜合成条件，并利用红外吸收光谱、1~H、(13~C核磁共振、元素分析等仪器分析手段和量子化学从头算STO-3G对所得产物的结构进行了表征；同时较详细地研究了疏水基碳链长度、反应取代度对合成产物的溶解性、表面活性、乳化性、泡沫性、吸湿保湿性和配伍性等物化性质和应用性能的影响规律。

The structure is characterized by elemental analysis, IR and single crystal X-ray diffraction.

通过IR，元素分析对配合物进行了表征，并用单晶X射线衍射测定了其结构。

The complexes were characterized by elemental analysis, IR spectrum, and single crystal X-ray diffraction.

通过元素分析、红外光谱和X射线单晶衍射方法对配合物进行了表征。

It was characterized by X-ray single crystal diffraction, elemental analysis, FT-IR spectroscopy and 1H NMR.

通过X射线单晶衍射、元素分析、FT-IR光谱和1H NMR对其进行了表征。

The complex was characterized by elemental analysis, IR spectrometry and single crystal X-ray diffraction.

进行了元素分析、红外光谱表征，并用X-ray单晶衍射法测定了配合物1的晶体结构。

Compounds 1~8 have been characterized by elemental analysis, IR spectra and X-ray crystallography.

配合物1，4，5和6均为三维聚合结构，而2和3则具有双链结构。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。