红外光谱在定量分析中的应用

本文对近十年红外光谱在定量分析中的应用进行了概述。偏最小二乘法,一阶导数、二阶导数等化学计量法在定量分析中得到了普遍的应用,反射、探针、漫反射等技术的发展拓宽了红外光谱定量分析的领域。固体、液体、气体均可计量的优势更加突出。实现了单一物质,二元或多元物质的定量测定。     

3-苄基-4-氨基-5-芳胺基-1,2,4-三唑的合成与表征

酰氨基硫脲是一类重要的有机合成中间体[1-3]。其最终产物大都有消炎、镇痛、抗菌、杀虫、除草、调节植物生长等生理活性。本文以苯乙酸乙酯与芳胺为基本原料,经多步反应,制得1 苯乙酰基 4 芳基氨基硫脲,研究了它们在水合肼存在下的关环反应,合成了3 苄基 4 氨基 5 芳胺基 1,2,4 三唑,其结构经元素分析、红外光谱、核磁共振氢谱、碳谱表征。1　实验部分1 1　仪器与试剂ＸＴ4Ａ型显微熔点仪(温度计未校正);ＣＥ公司(意大利)Ｆｌａｓｈ1112型自动元素分析仪;Ｂｒｕｋｅｒ公司(德国)Ｅｑｕｉｎｏｘ55型红外分光光度计,ＫＢｒ压片;Ｂｒｕｋ…     

稀土乙酰丙氨酸咪唑配合物的合成及光谱性质

稀土元素由于特殊的外层电子构型,在与不同类型配体配位时,呈现出丰富多彩的配位行为和结构,其配合物,特别是有机配合物,由于具有发光性强、选择性好的特点,在发光、激光材料创制、结构探针、荧光免疫分析及生物传感器等领域的研究和应用引起广泛关注.氨基酸、肽是各种生物大分子的基本组成单元,咪唑存在于组氨酸、羧肽酶、血红蛋白等生物分子中参与配位或"变构效应"成为活性部位结构,唑环有丰富的能级,其作为含N富电子体系可与稀土离子形成既有生物活性,又有优良光学性能的配合物.     

Sensitive Determination of DNA by Resonance Light Scattering with Pentamethoxyl Red

A novel sensitive method for the determination of nucleic acid (DNA) using the resonance light scattering (RLS) spectra of pentamethoxyl red has been developed. It is based on the effects on the resonance light scattering of Pentamethoxyl Red. The effective factors and the optimum conditions were studied, and the enhanced intensity of RLS is in proportion to the concentration of nucleic acids in the range of 0–2.54 µg mL⁻¹ for ct-DNA, 0–4.54 µg mL⁻¹ for hs-DNA. The limits of detection are 1.1 and 2.1 ng mL⁻¹, respectively. Most foreign substances do not interfere in the determination, and the method has good selectivity and high sensitivity. It has been applied to the determination of DNA in synthetic samples and in real samples with satisfactory results.     

PTh / ZnO复合纳米粉的固相合成及其光谱特性

0引言导电聚合物/无机物纳米复合材料具有纳米材料和导电聚合物的共同特性,因此在电催化、二次充电电池材料、超级电容器材料等方面具有良好的应用前景[1]。聚噻吩(PTh)以及取代聚噻吩是导电聚合物领域中较早发现的具有环境稳定性和可加工性的材料之一。近年来,有关聚噻吩/无机物纳米复合材料的制备及其光电性能的研究倍受关注,Gebeyehu等[2]用PTh敏化纳米晶TiO2光伏电池,发现其光伏效率明显优于固态光伏电池;Jayant等[3]研究了PTh中的羧基基团的影响以及在纳米晶TiO2     

Prospects of Sol-Gel Process for Spectral Hole-Burning Glasses

Persistent spectral hole burning was studied in Eu³⁺ ions-doped Al₂O₃-SiO₂ glass prepared by a sol-gel method. The gel synthesized by the hydrolysis of Si- and Al-alkoxides and EuCl₃·6H₂O was heated in air and hydrogen gas atmospheres. For the glass heated in air to contain OH bonds, the hole was formed by the photoinduced rearrangement of the OH bonds surrounding the Eu³⁺ ions, and was thermally refilled and erased above 200 K. On the other hand, the glass heated in hydrogen gas showed the hole spectrum above 200 K. It was found that the hole depth was independent of the temperature and was 7% of the total intensity at room temperature. The proposed mechanism was the electron transfer between the Eu³⁺ ions and the defect centers formed in glass matrix.     

Ab initio and infrared spectral study of 4′-substituted phenylthiolbenzoates

The geometry of the 4′-cyano-(4′-CNPTB) and the 4′-methoxy-(4′-MePTB) phenylthiolbenzoates were obtained by ab initio calculations employing 6–31G basis set at Hartee-Fock level of theory. The results predict an extended form of the molecules and torsional angle between the phenyl rings at 90.85(6)⁰ and 90.87(3)⁰, respectively. On the basis of vibrational analysis the frequency assignment was carried out. The calculated frequencies were compared with the experimental IR spectral data in carbon tetrachloride, carbon disulfide solutions and in solid state.     

多组分光谱相关色谱及其在中药色谱指纺图谱分析中的应用

基于正交投影理论和相关色谱方法提出多组分光色谱方法提出多组分光谱相关 色谱。为克服联用色谱仪器的不等性噪声影响，采用目标组分投影前后的光谱夹角 余弦判据，判断不同的中药色谱指纹图谱的相关组分色谱峰簇。该方法为中药指纹 图谱的数据处理、合理评价以及中药谱效学的基本理论研究提供一种实用的工具。     

Superized Troesch complexes and cohomology for strict polynomial superfunctors

We adapt a construction due to Troesch to the category of strict polynomial superfunctors in order to construct complexes of injective objects whose cohomology is isomorphic to Frobenius twists of the (super)symmetric power functors. We apply these complexes to construct injective resolutions of the even and odd Frobenius twist functors, to investigate the structure of the Yoneda algebra of the Frobenius twist functor, and to compute other extension groups between strict polynomial superfunctors. By an equivalence of categories, this also provides cohomology calculations in the category of left modules over Schur superalgebras.