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1.
对美托拉宗进行了1H和13C MNR检测,通过DEPT和HMQC、HMBC等2D NMR技术对其1H和13C NMR数据进行了全归属和详细的解析,并指出其NMR数据特征.  相似文献   

2.
通过~1H NMR、NOE差谱和门控去偶~(13)C NMR等的研究确定了新合成的五对α-去氢氨基酸衍生物的构型,并利用部分弛豫、APT~(13)C NMR二维碳氢相关谱及~(13)C-~(19)F偶合常数等对NMR谱线进行了归属.  相似文献   

3.
Lasiodonin Acetonide的NMR数据解析   总被引:1,自引:0,他引:1  
对lasiodonin acetonide进行了1H和13C NMR检测,参考lasiodonin, maoecrystal T, wikstroemioidin B和rabdocoetsin A的1H、13C NMR数据,通过DEPT和1H-1H COSY、HSQC、HMBC等2D NMR技术对该化合物所有的1H和13C NMR信号进行了全归属和详细解析.  相似文献   

4.
苯基哌嗪衍生物的NMR波谱研究   总被引:2,自引:0,他引:2  
通过1H NMR、13C NMR、及HMBC、HSQC、1H-1H DQFCOSY等2D NMR方法对新合成的10个苯基哌嗪衍生物类抗高血压药物进行结构鉴定, 并对这些化合物的1H NMR和13C NMR信号进行了全归属. 初步探讨了取代基对分子13C化学位移的影响.   相似文献   

5.
2D NMR对刺五加种子中的一个三萜皂苷进行结构解析   总被引:2,自引:0,他引:2  
通过质谱、核磁共振谱并结合文献对一个三萜皂苷hederagenin 3-O-β-D-glucuronopyranpside进行结构解析. 通过2D NMR(HMQC、HMBC)对其进行了NMR全归属.
  相似文献   

6.
对恩替卡韦钠进行了1H和13C NMR检测,通过DEPT和1H-1H COSY、HMQC、HMBC等2D NMR技术对该化合物所有的1H和13C NMR信号进行了全归属,并通过NOESY确证了其相对立体结构.  相似文献   

7.
高碳糖希夫碱的1H NMR和13C NMR全归属   总被引:4,自引:3,他引:1  
对7个高碳糖希夫碱进行了1H和13C NMR检测,通过DEPT和1H-1H COSY,HMQC,HMBC等2D NMR 技术对其1H和13C NMR数据进行了全归属和较详细的解析,并指出其NMR特征.  相似文献   

8.
环维黄杨星D为自黄杨木中提取精制的有效生物碱,临床上已长期用于心血管疾病的治疗.本文用制备高效液相色谱提取、分离并纯化环维黄杨星D,用1D,2D NMR技术 (COSY,DEPT,HMQC 和 HMBC)对其结构进行研究,并且首次对环维黄杨星D的1H NMR 和 13C NMR 信号进行了全归属,同时通过NMR数据确证了环维黄杨星D的结构.  相似文献   

9.
通过1H NMR、NOE差谱和门控去偶13C NMR等的研究确定了新合成的五对α-去氢氨基酸衍生物的构型,并利用部分弛豫、APT 13C NMR二维碳氢相关谱及13C-19F偶合常数等对NMR谱线进行了归属.  相似文献   

10.
以含全氟烷基香豆素为原料合成了一系列含全氟烷基香豆素亚胺类化合物,通过对该类化合物的IR、MS、1H NMR、13C NMR的分析,归属了各NMR谱线,对相关化合物进行了结构确证,同时对该类化合物的光物理行为进行了初步研究.  相似文献   

11.
基于ZEMAX软件的重叠复眼的模拟与分析   总被引:2,自引:1,他引:1  
介绍了重叠复眼及其优点。与并列型复眼相比,重叠复眼有更高的光能量利用率和更高的灵敏度。首次利用ZEMAX软件对重叠复眼进行了实例模拟,通过光线追迹,详细分析了其工作原理,并且将重叠复眼与并列复眼在灵敏度和光能量利用率两方面进行了对比,得到了前者比后者有更高的光能量利用率和灵敏度的结论。  相似文献   

12.
Tris(tetraethylammonium) pentabromozincate(II) monohydrate, is a new semiorganic compound synthesized and crystallized by slow evaporation solution growth method at room temperature. The formation of the compound in the stoichiometric ratio was confirmed by elemental analysis. The crystalline nature of the compound was confirmed by powder X-ray diffraction method and the crystal system was found to be triclinic. The absorption spectrum of the compound shows absorption at 247 nm and it has wide transparency in the visible region. The lower cut-off wavelength and the optical transmittance window of the compound were identified by optical transmittance study. The thermogravimetric and differential thermal (TG–DTA) analyses were studied to find out the thermal stability of the synthesized compound. The thermal anomalies observed in the differential scanning calorimetry (DSC) analysis indicate that the compound shows a first order phase transition. The FTIR spectrum was used to characterize the various chemical bonds and water molecule present in the compound. The nonlinear optical property (NLO) of the material was analyzed by modified Kurtz–Perry powder technique and found that it has SHG efficiency three times greater than that of KDP. The dielectric constant and dielectric loss of the compound decrease with increase in frequency.  相似文献   

13.
空气-水双热源复合换热器是太阳能-空气双热源复合热泵系统的核心部件,空气-水双热源复合换热器的有效复合换热温差对空气-水双热源复合换热器的换热性能以及太阳能-空气双热源复合热泵的系统性能具有重要影响。建立了空气-水双热源复合换热器和太阳能-空气双热源复合热泵系统的数学模型,利用数学模拟的方法研究了空气-水双热源复合换热器结构参数,即内外管径、翅片间距对有效复合换热温差的影响。模拟结果表明:空气-水双热源复合换热器的有效复合换热温差随内管管径的减小、外管管径的增大以及翅片间距的减小而增大。  相似文献   

14.
通过拉曼光谱和红外光谱法分析维生素C包合物,探讨拉曼光谱法作为一种新的验证包合物形成方法的可行性。采用饱和水溶液法制备维生素C包合物,共焦拉曼光谱仪和傅里叶转换红外光谱仪分别测定并获得β-环糊精、维生素C、维生素C与β-环糊精物理混合物及其包合物四种固体粉末的拉曼图谱和红外图谱并将其进行对照分析。拉曼图谱和红外图谱共同证明了维生素C通过氢键作用嵌入β-环糊精的疏水空腔形成包合物,从而增加了它的稳定性。拉曼光谱法具有快速、准确、简便、无损测量等显著优势,可作为验证药物包合物的形成重要手段。  相似文献   

15.
以茄呢醇为原料合成了两个新的N-(茄呢基哌嗪烷基)蒽甲胺类三胺化合物,其结构均经1H NMR,IR,MS,元素分析等方法确证,初步的体外生理活性测试表明两个化合物对L1210(淋巴性白血病细胞)的IC50(抑制浓度)分别为4.3和3.1μmol.用紫外光谱、荧光光谱研究了N-(茄呢基哌嗪丁基)-9-蒽甲胺(4b)与DNA的相互作用方式,并与N1-(4-丁胺基)-N4-(9-蒽甲基)-1,4-丁二胺(5)与DNA相互作用的光谱进行了对比.实验结果表明,化合物4b对DNA-EB体系产生荧光增色作用而5对DNA-EB体系则产生荧光猝灭作用,但DNA对两种化合物作用的荧光光谱均表现出荧光猝灭现象.推测结构中含有茄呢基长链及两个叔氮原子的化合物4b与DNA可能仅是静电结合或分子部分嵌入DNA,而化合物5与DNA的作用表现为典型的嵌入式作用.  相似文献   

16.
 采用激波等离子法制备了C/ZrO2纳米复合粉体。通过X衍射、拉曼光谱对复合粉体的晶相组成进行了分析,利用透射电镜(TEM)对复合粉体的粒度、形貌进行了表征,借助热重分析对粉体的组成进行了检测,进一步对粉体的制备机理进行了探讨。结果表明:激波等离子体法可实现C/ZrO2纳米复合粉体的快速制备,所制备出粉体的粒径在10 nm左右,复合粉体中碳为石墨相,约占总量的63%(质量分数),氧化锆占总量的37%,主相为四方相。  相似文献   

17.
本文测试了20个标题化合物的紫外光谱和荧光光谱,讨论了它们的取代基效应,研究了16种溶剂对其中两个化合物的紫外光谱的溶剂效应以及一个化合物的光反应  相似文献   

18.
对乙酰氨基酚包合物拉曼光谱和红外光谱研究   总被引:1,自引:0,他引:1  
通过拉曼光谱和红外光谱法分析对乙酰氨基酚包合物,探讨拉曼光谱作为一种新的验证包合物形成方法的可行性.采用饱和水溶液法制备对乙酰氨基酚包合物,共焦拉曼光谱仪和傅里叶转换红外光谱仪分别测定并获得β-CD、对乙酰氨基酚、摩尔比1:1的β-CD与对乙酰氨基酚物理混合物及其包合物四种物质粉末的拉曼图谱和红外图谱并将其进行对照分析...  相似文献   

19.
Single crystals of dihydroxylammonium tetrachlorostrontium(II) dihydrate were grown by slow evaporation solution growth method at ambient temperature. The suitability of this material for optical application was studied by UV–visible absorption and optical transmittance spectroscopic techniques. The powder X-ray diffraction (XRD) method was used to confirm the crystalline nature of the compound and it is observed that the compound crystallized in orthorhombic system. The thermal stability of the title compound was studied by thermogravimetry and differential thermal (TG–DTA) analyses. The thermal anomalies observed in the low temperature differential scanning calorimetry (DSC) study indicate the occurrence of the first order structural phase transitions in the compound. The FTIR spectrum characterizes the various chemical bonding and water molecules in the compound. The nonlinear optical property of the material was analyzed by modified Kurtz–Perry powder technique. The dielectric constant and dielectric loss of the compound decreases with increase in frequency.  相似文献   

20.
Single crystals of a novel compound, bis(ethyltriphenylphosphonium) tetrabromomanganate(II) dihydrate (BTP-Mn) were grown by solution growth-slow evaporation technique from aqueous solution of the compound at ambient temperature. The grown crystals were characterized by elemental analysis, powder X-ray diffraction, thermal analysis, nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infra-red spectroscopy (FTIR) techniques. The chemical composition of the compound was revealed by elemental analysis and its crystallinity was confirmed by powder X-ray diffraction. Thermal analysis confirmed that the compound was stable up to 125°C. The various kinds of protons and carbons present in the compound were confirmed by 1H NMR and 13C NMR technique respectively and the presence of phosphorous was confirmed by 31P NMR spectrum in the compound. The modes of vibration of different molecular groups present in the compound were identified by FTIR spectral analysis. The second harmonic generation behaviour was tested by Nd:YAG laser source.  相似文献   

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