几种单双糖及其部分固态金属糖络合物的远红外光谱研究

糖类物质的远红外谱有多个吸收峰 ,并且每种糖有其特征光谱。由于其相对强度顺序不同 ,我们可以选择前四个强峰用编号的方式来简单地区分各种糖。当形成络合物以后 ,出现金属氧振动的宽峰 ,说明远红外技术是一种判断络合物形成及探知其结构的有效手段     

质子辐照聚苯胺的Raman与红外光谱研究

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。     

大血藤药材及不同提取物FTIR的比对分析

采用红外光谱法(FTIR)、二阶导数红外光谱法和二维相关光谱分析技术(Two-Dimensional Correlation Spectroscopy) 对江西和安徽大血藤药材、水提物、蒽醌类提取物和残渣进行了快速无损比对分析研究,从中发现两产地大血藤药材的谱图中均出现1 400～1 620 cm-1和1 000～1 200 cm-1两个强峰带,说明药材含有大量的药效成分蒽醌类和糖类物质;蒽醌提取物的谱图中也有上述2个谱带,但1 400～1 620 cm-1谱带明显强于1 000～1 200 cm-1谱峰,说明该提取工艺适宜提取蒽醌类物质;而水提物中2个谱峰带则是后者明显强于前者,证实该提取工艺适宜提取糖类物质;另外通过红外谱图和二阶导数红外谱图的对比发现在药材残渣中含有大量的草酸钙晶体。证明红外光谱技术不仅能对原药材及提取物的药效基团进行分析和指认,还能区分不同产地药材的提取物含量的高低,成功地建立了大血藤及其不同提取物药效成分比对分析的新方法。     

Synthesis and solution properties of cationic gemini surfactants with long unsaturated tails

Gemini surfactants 22:1-s-22:1, where s = 2 and 6 methylene groups and 22:1 refer to erucyl dimethylammonium bromide chains, together with the monomeric surfactant erucyl bis-(hydroxyethyl) methylammonium bromide (EHAB) which has the same long unsaturated tails with gemini surfactants, were synthesized and characterized and solution properties of these surfactants were investigated using surface tension, conductivity and viscosity measurement. It has been found that the critical micelle concentration (cmc) values of 22:1-2-22:1 and 22:1-6-22:1 are 15.4 and 8.3 μM, respectively, less than the cmc value of EHAB (38 μM). On the other hand, the surface tension of 22:1-2-22:1 and 22:1-6-22:1 at cmc are 40.9 and 42.4, respectively, greater than the surface tension of EHAB (30.9 at cmc). Both 22:1-2-22:1 and 22:1-6-22:1 have nearly the same value of a₀ (the minimum head group areas per surfactant molecule at the aqueous solution/air interface), which is almost the half value of a₀ corresponding to EHAB. On the other hand, the ionization degree α of micelles of both 22:1-2-22:1 and 22:1-6-22:1 is approximately twice the value of α corresponding to micelles of EHAB. Though 22:1-2-22:1 has more similarity with 22:1-6-22:1 rather than EHAB as presented above, 22:1-2-22:1 in water cannot enhance the viscosity of the solution significantly in the presence of salt. In contrast, both 22:1-6-22:1 and EHAB in water can give rise to highly viscoelastic or gel-like solutions even at the high temperature in the presence of salt. In particular, 22:1-6-22:1 has proved to be a more efficient candidate for high temperature rheology-control applications than EHAB. The effect of salt upon the viscosity of 22:1-6-22:1 in aqueous solution is significant. The most proper ratio of 22:1-6-22:1/NaSal for enhancing the viscosity of solution has been proved to be 0.7.     

Smoothness of Time Functions and the Metric Splitting of Globally Hyperbolic Spacetimes

The folk questions in Lorentzian Geometry which concerns the smoothness of time functions and slicings by Cauchy hypersurfaces, are solved by giving simple proofs of: (a) any globally hyperbolic spacetime (M, g) admits a smooth time function whose levels are spacelike Cauchy hyperfurfaces and, thus, also a smooth global splitting if a spacetime M admits a (continuous) time function t then it admits a smooth (time) function with timelike gradient on all M.The second-named author has been partially supported by a MCyT-FEDER Grant, MTM2004-04934-C04-01.To Professor P.E. Ehrlich, wishing him a continued recovery and good health     

Observation of B Meson decays to b1pi and b1K

We present the results of searches for decays of B mesons to final states with a b1 meson and a charged pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 382x10(6) BB[over ] pairs produced in e+e- annihilation. The results for the branching fractions are, in units of 10(-6), B(B+-->b1(0)pi+)=6.7+/-1.7+/-1.0, B(B+-->b1(0)K+)=9.1+/-1.7+/-1.0, B(B0-->b1(-/+)pi(+/-))=10.9+/-1.2+/-0.9, and B(B0-->b1(-)K+)=7.4+/-1.0+/-1.0, with the assumption that B(b1-->omega pi)=1. We also measure charge and flavor asymmetries A(ch)(B+-->b1(0)pi+)=0.05+/-0.16+/-0.02, Ach(B+-->b1(0)K+)=-0.46+/-0.20+/-0.02, A(ch)(B0-->b1(-/+)pi(+/-))=-0.05+/-0.10+/-0.02, C(B0-->b1(-/+)pi(+/-))=-0.22+/-0.23+/-0.05, DeltaC(B0-->b1(-/+)pi(+/-))=-1.04+/-0.23+/-0.08, and A(ch)(B0-->b1(-)K+)=-0.07+/-0.12+/-0.02. The first error quoted is statistical, and the second systematic.     

彝药大红袍、鸡根红外光谱的快速、无损分析

采用傅里叶变换衰减反射红外光谱法(ATR-FTIR)对2种彝药药材进行了快速无损的红外光谱测定。鸡根的主要特征峰是1 726,1 641 cm-1(宽峰), 1505 cm-1(小峰),1 379 cm-1附近为四指小峰,1 244 cm-1(小尖峰),在920～1 200 cm-1有1个阶梯峰C(最强峰);大红袍的特征峰是1 605 cm-1(次强, 单峰), 1 512 cm-1(小峰),1 438 cm-1(小尖峰),1 044 cm-1(最强,单峰)。实验发现2类块根类药材光谱有一共同点,即由C—O—C振动在1 034 cm-1处产生的吸收峰最强,说明彝药块根的红外吸收光谱图主要由碳水化合物木质素、纤维等吸收峰组成。     

Electron Spin Resonance and Cyclic Voltammetry Studies of Nitrofurane and Nitrothiophene Analogues of Nifurtimox

The electron spin resonance (ESR) of radicals obtained by electrolytic reduction of 4-[2-(3,4-Dimethoxiphenyl)ethyl]-1-(5-nitrofurfurylidine)semicarbazide and 4-[2-(3,4-Dimethoxyphenyl)ethyl]-1-(5-nitrothienilydene)semicarbazide were measured in DMSO. The electrochemistry of these compounds was studied in DMSO, DMF and ACN using cyclic voltammetry.     

苏氨酸的太赫兹及拉曼光谱研究

采用太赫兹时域光谱和拉曼光谱法对L-苏氨酸多晶粉末进行测试研究,获得了样品在0.2—2.8 THz（6.7—93.2 cm^-1）波段的特征吸收和10—4000 cm^－1波段的拉曼散射谱;分别在6.7—93.2 cm^－1和400—4000 cm^－1两个波段进行了吸收光谱与拉曼散射光谱的对比,根据晶胞分子所属的空间群,对隶属于分子的极性和非极性振动模式（A, B₁, 关键词： 太赫兹光谱 拉曼散射 氨基酸     

甲氧氯普胺和盐酸普鲁卡因顺序注射光谱研究和测定

在酸性介质中,铈(Ⅳ)与甲氧氯普胺和盐酸普鲁卡因反应生成不稳定的红色产物,研究了不同条件下的光谱吸收曲线,初步探讨了反应机理,并据此建立了顺序注射光度法测定甲氧氯普胺和盐酸普鲁卡因的新方法。测定甲氧氯普胺方法的线性范围9.71～116.6 μg·mL-1,检出限6.5 μg·mL-1,进样频率45 h-1。测定盐酸普鲁卡因的方法的线性范围10.0～130.0 μg·mL-1,检出限7.4 μg·mL-1,进样频率45 h-1。用于针剂和胃复安药片中甲氧氯普胺的含量以及针剂中盐酸普鲁卡因含量的测定,并与标准测定方法对照,经统计学处理无显著性差异,结果满意。     

航空育种牛膝中的微量元素和重金属含量分析

微量元素和重金属是评价中成药质量的重要指标。文章应用ICP-MS分析了航天育种牛膝中微量元素和重金属的含量。结果表明航天育成的牛膝中含有丰富的对人体有益的元素,特别是Ca,Fe,Zn,Mn,Cu,Se和Mo,含量分别达到9 182.252 μg·g-1·DW,310.5 μg·g-1·DW,24.718 μg·g-1·DW,18 416.97 ng·g-1·DW,5 518.97 ng·g-1·DW,1 747.692 ng·g-1·DW和211.87 ng·g-1·DW,这对人类健康意义重大。重金属（As,Pb,Hg,Cd和Cr）的含量分别是514.332 ng·g-1·DW,1 657.65 ng·g-1·DW,13.212 ng·g-1·DW,49.22 ng·g-1·DW和922.038 ng·g-1·DW,含量偏高但符合相关标准。除了品种以外,栽培中药材时选择优质的土壤和合适的栽培条件,是提高微量元素含量和有效控制重金属含量的重要措施。     

Infrared spectrum of HCN and HCN

The high-resolution spectrum of H¹²C¹⁴N has been measured near 4870 and 6060 cm⁻¹. The following bands have been identified and analyzed: 01¹2-00⁰0, 02⁰2-01¹0, 02²2-01¹0, 04⁰1-00⁰0, 11¹1-00⁰0, 12⁰1-01¹0, and 12²1-01¹0. The C---N stretching fundamental (ν₃) of H¹²C¹⁵N has also been measured near 2100 cm⁻¹. This fundamental is found to be 3 cm⁻¹ higher than previously reported. Other bands that have been identified in the H¹²C¹⁶N spectrum are 03¹0-00⁰0, 04⁰0-01¹0, 04²0-01¹0, and 01¹1-01¹0.     

Synthesis and Characterization of New Y-shaped Fluorophores with an Imidazole Core

Four new y-shaped fluorophores of 4- {4,5-[2,2'-Bis(2,4,6-trimethoxyphenyl)vinyl]-1-H-imidazole-2-yl}benzonitrile 1a, 2-phenyl-{4,5-[2,2'-Bis(2,4,6-trimethoxyphenyl)vinyl]-1-H-imidazole} 1b, 2- (9-anthryl)-{4,5-[2,2'-Bis(2,4,6-trimethoxyphenyl)vinyl] }-1-H-imidazole 1c and 2- (4-nitrophenyl) - {4,5-[2,2'-Bis(2,4,6-trimethoxyphenyl)vinyl] -1-H-imidazole 1d which bear an imidazole core, were synthesized for the first time via intermediate 1,6-Bis(2,4,6-trimethoxyphenyl)hexa-1,5-diene-3,4-dion with different aldehydes. The structures of the new derivatives were confirmed by (1)H NMR, (13)C NMR and FT-IR. The optical properties such as absorption and emission maxima, Stokes' shift and quantum yield values were investigated in solvents of toluene, tetrahydrofuran and acetonitrile. The products show intense emission maxima in the range of 440-630?nm. The imidazole derivatives exhibited excellent photostabilities.     

核酸-甲基青莲6B分子作用体系的研究与应用

基于核酸对甲基青莲6B的减色效应,以阳离子型染料甲基青莲6B为生色探针,研究该染料与核酸的结合反应,建立了新的核酸测定体系,研究探讨了体系的作用机理。在pH＝9.0条件下,hs-DNA,sm-DNA, ct-DNA,yeast RNA的浓度与甲基青莲6B减色效应成线性关系,响应线性范围分别为0.50～4.00 μg·mL-1,0.20～5.00 μg·mL-1,0.20～5.00 μg·mL-1,0.20～4.50 μg·mL-1,检出限(3σ/K)分别为0.082,0.037,0.038,0.041 μg·mL-1。分析核酸合成样品,回收率为93.5%～105.0%。     

3-氧-五亚甲基桥联茚和甲氧乙基茚氯化稀土络合物的FT-拉曼和红外光谱

３┐氧┐五亚甲基桥联茚和甲氧乙基茚氯化稀土络合物的ＦＴ┐拉曼和红外光谱聂崇实邹刚钱长涛（中国科学院上海有机化学研究所上海２０００３２）ＦＴ┐ＲａｍａｎａｎｄＩＲＳｐｅｃｔｒｏｓｃｏｐｙＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆ３┐Ｏｘａ┐ｐｅｎｔａｍｅｔｈ...     

胺基化合物修饰戊二醛交联壳聚糖树脂的合成及其红外光谱研究

研究了以三聚氯氰为活化剂,正丁胺、二甲胺、三甲胺、三乙胺、苯甲胺、对甲基苯胺、对氨基苯磺酸修饰戊二醛交联壳聚糖的制备及其红外光谱。壳聚糖1 155 cm-1的糖苷键ν_(C—O—C)吸收峰、899 cm-1的环振动吸收峰和1 030 cm-1的伯羟基ν_(C—OH)吸收峰基本不变。在3 430～3 440 cm-1的ν_(O—H)和ν_(N—H)吸收峰稍有变化,1 400～1 384 cm-1的δ_(C—H)吸收峰变化较明显。氨基化修饰交联壳聚糖仲羟基的ν_(C—OH)吸收峰由1 095 cm-1移至1 060～1 070 cm-1。三聚氯氰活化交联壳聚糖在803～812 cm-1和1 584～1 590 cm-1出现均三嗪环骨架振动吸收峰。随取代度和脱乙酰度不同,壳聚糖的酰胺Ⅰ,Ⅱ,Ⅲ峰强度变化明显。伯仲胺修饰交联壳聚糖在1 517～1 530 cm-1出现质子化氨基δ_(N—H)吸收峰,三甲胺、三乙胺修饰交联壳聚糖此峰消失或减弱,但在1 400～1 500 cm-1出现一组ν_(C—N)吸收峰。     

氨基酸DLH及其稀土镧配合物的高压红外和拉曼光谱研究

测定了DL-2-氨基-4-磺酸基-丁酸 [DLH, DL-Homocysteic acid, (NH+₃)-CH(COOH)-(CH₂)₂-SO-₃] 及其稀土La配合物[La(DLH)₂Cl₃·H₂O=LaL₂]在不同压力下的红外和拉曼光谱。DLH 在50 kbar左右压力以下存在两个压力诱导相转变区,它们分别在17和37 kbar左右,两者均为二级相转变,认为分子间氢键的存在是出现两个压力诱导相转变区的原因。在红外光谱中,SO-₃的对称伸缩振动的压力灵敏度(dν/dp)表现出与其他振动模式不同的变化趋势,它们在低压相区的平均压力灵敏度为0.30 cm-1·(kbar)-1、中压相区为0.32 cm-1·(kbar)-1、高压相区为0.41 cm-1·(kbar)-1,低压相区与高压相区的比值为0.72, 而其他振动模式刚好相反,低压相区与高压相区的比值为4.8。稀土La配合物LaL₂的生成,改变了分子间的氢键,在50 kbar左右压力以下只观察到1个压力诱导相转变区(27 kbar附近)。在红外光谱中,配合物LaL₂中SO-₃的反对称伸缩振动的压力灵敏度(dν/dp)也表现出与其他振动模式不同的变化趋势,它们在低压相区的平均压力灵敏度与高压相区的平均压力灵敏度的比值为0.43, 而其他振动模式的比值为2.5。     

Structure Elucidation and Assignment of 1H and 13C Spectra of the New Fused Cyclobutane-Naphthofuran Derivative by Two-Dimensional NMR in Different Solvents

One of the major product from the photodimerization of 2-[2-(2-methyl-phenyl)ethenyl)]naphtho[2. 1-b]furan (1) is a new fused cyclobutane-naphthofuran derivative, 6-(2-methylphenyl)-1-[2-(2-methylphenyl)ethenyl]-7-(2-naphtho-[2,1-b]furyl)-3-[2,1]naphtho-2-oxabicyclo[3.2.0]hept-3-ene (2). Its ¹H and ¹³C NMR spectra were fully assigned by the application of COSY, LR COSY, NOESY, APT and HETCOR experiments in deuterated chloroform, acetone and benzene solutions.     

Topological Sectors and a Dichotomy in Conformal Field Theory

Let be a local conformal net of factors on S¹ with the split property. We provide a topological construction of soliton representations of the n-fold tensor product that restrict to true representations of the cyclic orbifold We prove a quantum index theorem for our sectors relating the Jones index to a topological degree. Then is not completely rational iff the symmetrized tensor product has an irreducible representation with infinite index. This implies the following dichotomy: if all irreducible sectors of have a conjugate sector then either is completely rational or has uncountably many different irreducible sectors. Thus is rational iff is completely rational. In particular, if the -index of is finite then turns out to be strongly additive. By [31], if is rational then the tensor category of representations of is automatically modular, namely the braiding symmetry is non-degenerate. In interesting cases, we compute the fusion rules of the topological solitons and show that they determine all twisted sectors of the cyclic orbifold.Supported in part by GNAMPA-INDAM and MIURSupported in part by NSF