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测量并分析了盐酸苯海拉明的红外光谱和拉曼光谱。在Raman光谱中, 1001 cm-1出现一个极强峰, 在1030 cm-1和618 cm-1各有一个中等峰,此外,在红外光谱中, 714 cm-1和757 cm-1附近出现极强的吸收峰,认定这个化合物中存在单取代苯。C-N的对称伸缩振动出现在837 cm-1, 1433 cm-1和1470 cm-1分别为CH2和CH3的变形振动, 在红外光谱中, 1020 cm-1处明显的吸收峰属于C-O-C反对称伸缩振动。此外, 测量得到含量为25 mg苯海拉明药片的拉曼光谱与纯苯海拉明的拉曼峰比较一致, 可作为无损快速检测该药物的手段。 相似文献
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红外光谱和拉曼光谱的联系和区别 总被引:1,自引:0,他引:1
文章综述红外光谱和拉曼光谱的基本原理、产生条件,讨论二者之间的联系和区别:(1)红外光谱常用于研究极性基团的非对称振动;拉曼光谱常用于研究非极性基团与骨架的对称振动;(2)拉曼光谱一次可以同时覆盖40-4000cm-1波数的区间,可对有机物及无机物进行分析;(3)拉曼光谱可测水溶液,而红外光谱不适用于水溶液的测定;(4)拉曼光谱中既有红外光谱解析中的定性三要素还有去偏度ρ,通过测定ρ,可以确定分子的对称性.这两者在应用中互补,掌握和运用这两种光谱技术在分子定性、定量、分子结构及表面形态等研究方面具有一定的指导意义. 相似文献
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研究应用拉曼光谱法分析验证氯霉素包合物的可行性。采用拉曼光谱仪和傅里叶红外光谱仪分别测得β-环糊精、氯霉素、β-环糊精和氯霉素物理混合物、氯霉素包合物四种物质固体粉末的拉曼图谱和红外图谱, 并对其进行对照分析。 结果表明拉曼光谱法可获得与红外光谱法一致的结果, 结果表明氯霉素的苯环结构和易水解基团二氯乙酰胺基通过氢键作用被包裹在β-环糊精的空穴结构中形成包合物, 增加了氯霉素的稳定性和溶出度, 并且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
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测量了十四个稀土五磷酸盐(除P_mPP外)和YPP晶体的红外吸收光谱、反射光谱和拉曼光谱。用基团频率对所观察到的振动谱带进行了归属。发现它们的光谱按晶型可分为三类,与X线衍射的结果一致。观察到O—P—O伸展振动、变角振动和Ln—O伸展振动频率随稀土原子序数增加而增加的线性关系。认为Ln—O键合具有共价性质。讨论了O—P—O振动带向高频移动的可能原因。 相似文献
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本文用Raman与红外光谱表征质子辐照聚苯胺的结构。聚苯胺的红外光谱的主要吸收峰经低能和高能质子辐照后分别向高频移动2—12cm~(-1)和5—26cm~(-1)。在1228,1344,1380和1444cm~(-1)处的Raman带在低能质子辐照后分别移到1236,1348,1392和1456cm~(-1),在804,1588和1620cm~(-1)处的Raman带,经高能质子辐照后分别移到808,1592和1624cm~(-1)。醌型结构的拉曼线1588cm~(-1)也上移4cm~(-1)。这些结果表明,质子辐照不同于质子酸的掺杂(质子化过程)而是引起聚苯胺中分子链的断裂。 相似文献
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The spectroscopy of porphyrins has been developing rapidly during the last two decades, this class of compounds being of great biological importance and possessing a number of significant properties. Different spectroscopic techniques, viz., electronic spectroscopy including fine-structure quasiline spectra (Shpolsky effect), infrared spectroscopy, luminescence, flash photolysis, ESR and NMR spectroscopy etc., have been applied to the study of these molecules (see reference 1 for a review). However until recently there were no publications on Raman spectra of porphyrins and related compounds although it is evident that a complete analysis of molecular vibrations is impossible without knowing the Raman frequencies, especially for centrosymmetrical molecules. We have obtained Raman spectra of two porphin derivatives, viz., copper and nickel octamethylporphin 2 which seems to be, together with data on hemoglobin and cytochrome3-5 and on chlorophylls 6, the first observation of Raman spectra of porphyrins. In this paper Raman spectra of several metalloporphyrins are presented including metal complexes of porphin, octamethylporphin, etioporphyrin I, meso-tetraphenylporphin and tetrabenzporphin. For some of them Shpolsky spectra have been obtained and a juxtaposition is made of the two kinds of spectral data concerning the frequencies of molecular no- modss. Also some data of infrared spectra are presented. 相似文献
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由拉曼光谱仪测试巨晶普通辉石及包体中的顽火辉石、透辉石拉曼光谱,描述了谱图的位置、形态和相对强度,分析了振动模式,同时对相应的离子基团如非桥氧Si—O—,桥氧Si—O0,O—Si—O,M—O做了谱带归属。通过不同切片方向的谱带强度相对大小及某些谱带的缺失,初步研究了辉石族矿物晶体结晶学定向问题。 相似文献
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菌紫质是一种可进行光信息存储与能量转换的生物膜蛋白分子。在光化学循环中 ,它包含的视黄醛产生快速的全反——— 1 3顺式异构化并去质子 ,然后又重新质子化并在反应循环终了转为全反式构型。了解菌紫质的分子构造及光化学反应机制是很有意义的事 ,但由于菌紫质是紫色膜蛋白 ,加之光反应时的荧光问题 ,用普通拉曼技术获得菌紫质的特征峰有一定困难。一般都用时间分辨付里叶变换红外光谱来进行它的测试工作。文本采用传统拉曼技术 ,分别用 5 3 2、785和 1 0 64nm波长激光作激发光源 ,测试了菌紫质的拉曼光谱 ,并得到了菌紫质的大部分特征拉曼谱带。 相似文献
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采用高温固相法制备不同浓度Tb元素掺杂的硅铝酸盐荧光材料。当烧结温度为1 350 ℃时其荧光强度达到最大值。通过X射线衍射图谱可知体系中基质材料为CaAl2Si2O8,Tb元素以Ca2Tb8(SiO4)6O2相存在。通过拉曼光谱分析可知,870 cm-1处振动峰与Ca2Tb8(SiO4)6O2中Tb与硅氧四面体的伸缩振动相关;Tb原子与硅氧四面体之间的弯曲振动产生408 cm-1振动峰。随着Tb掺杂量的增加,拉曼振动峰强度,荧光分光光度计测得的荧光光谱以及拉曼光谱仪测得的光致发光光谱的峰强均呈现先增后减的变化规律。该体系中Tb元素与硅氧四面体匹配数量逐渐增加,当Tb掺杂量超过一定极限值时,体系内发生浓度猝灭,导致荧光性能下降。采用325 nm激光作为激发光源,用拉曼光谱仪的光致发光测量模式产生的峰形与传统荧光分光光度计的光谱曲线一致,但其光谱分辨率明显高于传统荧光分光光度计获得的光谱,有助于对细微能级跃迁现象加以区分。 相似文献
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In this paper the automatic analysis of Raman spectra is described. The method applied is so-called SRIP, i.e. “Standard Representation Independent Parameter” fitting, which has been given previosly and proven to be steadily converging, if the model has been chosen properly. The approach is extended here by introducing the interactive continuation of the analysis: some of peaks may be rejected or left in the model with fixed up parameters of the position and full width at half maximum. The main improvements of the algorithm is to be applied to the Raman spectra analysis include the mixed mathematical model as well as the enhanced sensitivity in discovering of peaks. That is achieved by the analysis of smoothed residuals at the steps of the peak revelation. This approach enables successful analysis of spectra with low signal to noise ratio, without limitation in number of the peaks. The reliability of Raman band analysis was proven using overlapped spectra of solution of noninteracting liquids: carbontetrachloride (CTC), dichloromethane (DCM) and 1,2 dichloroethane (DCE) with different molar ratio. Solution spectra can be calculated from component spectra and compared with analysis by described method. 相似文献
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洪文兴 《光谱学与光谱分析》2001,21(1):125-127
本文报道了我国发现的一种含大量Ba、Ti和Nb的硅酸盐类新矿物-包头矿的拉曼光谱特征,着重讨论了拉曼光谱带的归属问题,确定了包头矿中钛氧八面体和硅氧四面体的主要拉曼光谱的振动频率,进一步为包头矿的矿物学增添了谱学新资料。 相似文献
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On the basis of the calculations of normal vibrations of Zn– and Cu–tetrabenzoporphin, the literature spectra of resonance Raman scattering of the above compounds and the fluorescence spectra of Zn–tetrabenzoporphin are interpreted. The nonmirror character of the fluorescence and fluorescence excitation spectra is noted for some B
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symmetry type vibrations of the point group of symmetry D
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caused by the symmetry breakdown of a molecule in its electronic state S
1 due to the Jahn–Teller effect. 相似文献