邻苯二甲酸铕—铽络合体系的荧光性能和红外光谱研究

本文对在３６５ｎｍ波长紫外光激发下均可发出特征荧光的铕、铽邻苯二甲酸固体络合物以机械混合和化学作用两种混合方式，研究了这两系列混合络合物的荧光光谱和红外光谱。结果表明，无论其荧光发射波长还是其发射强度，铕、铽之间均存在相互影响；其中荧光发射峰位的变化较小，而荧光强度变化较大，铕、铽的荧光性能之间即存在相互敏化作用，又存在相互猝灭作用。红外光谱结果表明机械混合和化学作用都使络合物的结构发生了变化。     

发粉红色荧光的含铽络合物光谱表征

本文报道合成了可发出粉红色荧光的含铽络合物２－萘甲酸－邻菲罗啉－铽，并对其进行了荧光光谱及红外光谱研究，结果表明，由于２－萘甲酸，邻菲罗啉配体的混配作用，使铽离子的＾５Ｄ４－＾７Ｆ３跃迁产生较强的６１５ｎｍ发射峰，其发射强度大于由＾５Ｄ４－＾７Ｆ５跃迁产生的５４５ｎｍ发射峰，因而络合行发出粉红色荧光。     

几种金属与二氢杨梅素络合作用的光谱研究

金属离子(M)容易接受配体,成为中心离子,二氢杨梅素(DMY)是藤茶中活性最强的天然活性物质,可作为多基配体与金属发生络合反应.本文研究了DMY-M系统的紫外光谱、荧光光谱及红外光谱,与DMY相比,DMY-M有以下特点:紫外光谱吸收峰、荧光光谱发射峰位置基本不变,但强度减弱;羰基红外吸收峰发生红移,并在500- 700...     

铽与苯甲酸及其衍生物配合物的合成与发光特性

合成了铽与苯甲酸及其衍生物(苯甲酸、邻苯二甲酸、间苯二甲酸、水杨酸、邻氨基苯甲酸、磺基水杨酸)的配合物。经元素分析确定其组成结构式。研究了它们的红外吸收光谱、紫外吸收光谱及荧光光谱。紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收;红外光谱的研究表明,配合物的红外光谱不同于自由配体的红外光谱;荧光光谱的研究表明,铽与这六个配体的配合物都表现出较好的荧光性能,并发现磺基水杨酸铽配合物在本实验系列中其荧光发射最强。     

邻苯二甲酸—邻菲罗啉—铕—铽络合体系的荧光性能研究

波长为３６５ｎｍ的紫外光激发下均可发出特征荧光的邻苯二甲酸－邻菲罗啉－铕和铽固体络合物以机械研磨和化学作用两种方式进行混合，研究了这两系列混合络合物的荧光光谱和红外光谱。结果表明，由于铕、铽之间存在相互影响，其荧光强度变化较大，而荧光发射峰位基本不变。经化学混合后铽对铕的荧光强度有极强的敏化作用，铕对铽具有很强的猝灭作用，并用红外光谱对上述四种络合物体系的结构进行了表征     

不同土壤物理性质下石油类污染物LIF发射特征研究

利用激光诱导荧光技术可对土壤中石油类污染物快速检测,不同土壤物理性质下,污染物荧光发射特征具有一定差异。为实现外场检测时快速制备合适的土壤样品,实验研究了土壤疏松度、颗粒度、湿度与土壤中石油类污染物荧光强度及光谱稳定性之间的关系。压片机压强大于2 MPa时土壤样品荧光光谱的稳定性较好,九种不同疏松度的土壤样品荧光强度的相对标准偏差为3.51%。不同粒径的机油土壤样品荧光强度差异较小,其中100目土壤样品的荧光光谱RSD值为2.25%。结果表明,土壤样品表面呈平整洁净时,所得样品荧光光谱的稳定性较好,土壤疏松度和颗粒度对荧光光谱的影响较小。湿度对土壤样品荧光发射的影响较大,当土壤湿度低于10%,荧光强度变化较小;湿度范围大于10%时,荧光强度变化较大。为利用LIF技术对外场土壤中石油类污染物检测时,快速有效制备土壤样品及准确测量提供参考。     

混合固态铕铽配合物的荧光研究

由邻苯二甲酸氢钾,２,２’－联吡啶分别与ＥｕＣｌ３和ＴｂＣｌ３在乙醇水溶液中反应,合成了铕配合物Ｅｕ２Ｌ３Ｌ’和铽配合物Ｔｂ２Ｌ３Ｌ’（Ｌ＝邻苯二甲酸根,Ｌ’＝２,２’联吡啶）;以不同摩尔比混合两种配合物,经机械研磨,得混合固体铕铽配合物。测试了配合物的荧光光谱及红外光谱,结果表明,与单一铕配合物和铽配合物相比,混合固态配合物无论是荧光发射峰位还是荧光强度均发生了明显变化,铽对铕的荧光强度有敏化作     

铕与苯甲酸及其衍生物配合物的光谱分析

合成了铕与苯甲酸及其衍生物(苯甲酸、邻苯二甲酸、间苯二甲酸、水杨酸、邻氨基苯甲酸、磺基水杨酸)的二元配合物.经元素分析确定其组成式.研究了它们的红外吸收光谱、紫外吸收光谱及荧光光谱.紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收.红外光谱的研究表明,配合物的红外光谱不同于自由配体的红外光谱,证明了稀土与有机物形成了配合物.荧光光谱的研究表明,其中铕与苯甲酸、邻苯二甲酸及间苯二甲酸形成的配合物表现出铕的特征荧光.其中以苯甲酸铕的发射峰最强,最强发射峰位于λ=618nm处,显示铕的红光特征;而铕与磺基水杨酸、邻氨基苯甲酸、水杨酸的配合物却主要表现出配体的宽带发射,其中邻氨基苯甲酸铕分别在λ=399,452,547nm处有三个弱的发射峰,磺基水杨酸铕也只在λ=407nm处有一宽发射峰,未显示出铕的红光特征.     

苯甲酸稀土(Eu,La)配合物的红外和荧光光谱研究

用氯化稀土与苯甲酸铵在水溶液中反应,合成了苯甲酸稀土（Ｅｕ,Ｌａ）三元固体系列配合物,其化学组成式为（Ｅｕ１－ｘＬａｘ）Ｌ３（其中Ｌ为Ｃ６Ｈ５ＣＯＯ－,ｘ＝０．０～１．０）。研究了它们的红外光谱和荧光光谱。由红外光谱数据表明,配合物中羧基的对称和反对称伸缩振动吸收峰发生了分裂,而且羧基伸缩振动随着Ｌａ３＋离子含量的增加发生了规律性的变化。荧光光谱实验结果表明,用不发光的Ｌａ３＋离子取代苯甲酸铕中部分Ｅｕ３＋离子可以提高Ｅｕ３＋离子的特征荧光发射强度。     

用时间分辨光谱研究红细胞悬液的荧光发射

实验获得了激光照射红细胞悬液的荧光光谱,并分别监测不同荧光峰值波长处强度随时间的衰变过程,测试了其相应的荧光寿命。结果表明,在波长为407nm的激光照射下,红细胞悬液向外发射中心波长分别位于596,628,692nm的荧光光谱,各荧光峰对应衰变过程的平均荧光寿命分别为1.97,13.31,14.58ns。利用荧光强度和吸收率的加和性表示了混合物的总吸收率和总荧光发射强度,通过理论计算获得了红细胞悬液中锌卟啉、原卟啉和其他游离物参与荧光发射的相对含量和相对强度在不同荧光峰位的变化关系,进一步解释了不同峰位处荧光发射强度和平均荧光寿命的变化原因。     

Molecular and supramolecular structure of sulfonated polystyrene ionomers in solutions

The structure of sulfonated polystyrene ionomers in chloroform was studied by molecular hydrodynamics and neutron scattering methods. The ionomer containing 1.35 mol % of ionogenic SO₃Na groups undergoes the coil-globule transition and transforms to a micellar structure due to attraction of polar groups concentrated in the core surrounded by nonpolar chain fragments. At a sulfonation degree of 2.6 mol %, selfassembly of SO₃Na groups with adjacent chain segments to the structure such as a spherical layer, i.e., vesicle (hollow micelle with solvent) with boundaries formed by nonpolar chain fragments, is observed. Vesicular structures in solution associate in pairs. Intra- and interchain associations are significantly enhanced by hydrogen bonds in ionomers with acid groups SO₃H (2.6 and 4.47 mol %) which stabilize micellar structures, promoting their assembly into chain clusters and fragments of the simple cubic lattice.     

在监测固相反应过程中显微红外和漫反射红外光谱方法的比较

文中利用傅里叶红外显微镜和漫反射红外光谱监测聚苯乙烯磺酰氯树脂与乙醇胺在不同温度下的反应程度,对两种方法进行了比较。结果证明漫反射红外光谱是简单有效的方法,而显微红外光谱是研究单个树脂小球之间差异的有效手段。     

DL-2-氨基-4-磺酸基-丁酸的溶液结构分析

ＤＬ－２氨基－４－碘酸基－丁酸分子是一种重要的神经传导兴奋性游离氨基酸,本文利用红外光谱、拉曼光谱对其在溶液中的结构进行了分析讨论,结果表明ＤＬＨ在重水溶液中发生了解离,原来固体分子中的氢键被水分子破坏,重新组合排列形成了新的氢键体系,而且分子的骨架构型也发生了改变。     

三氧化硫低温磺化法合成聚苯乙烯磺酸新工艺

利用三氧化硫在低温条件下与聚苯乙烯合成聚苯乙烯磺酸,反应速度快,副反应少,后处理简单,是一种绿色合成新工艺.实验结果发现,最佳的反应条件为:常压下-20℃时,以氯仿为溶剂,三氧化硫与聚苯乙烯按0.8∶1的质量比混匀,低速搅拌反应时间30min,老化30 min.溶剂与产物分离后,测定纯净产品的磺化度为92.45%.通过...     

氧氢氧化铁对偶氮染料脱色作用的红外光谱研究

采用傅里叶变换显微红外光谱仪(FTIR),研究了两种纳米氧氢氧化铁矿(α-FeOOH),正方纤铁矿(β-FeOOH)对偶氮染料分子甲基橙和酸性红G的脱色作用.结果表明,(1)甲基橙和酸性红G在氧氢氧化铁表面位＞(＞为α或β)FeOH易形成配合物,尤其是具有两个-SO3 Na基团双齿结构的酸性红G易与纳米氧氢氧化铁发生配合反应被化学吸附,而具有较高的脱色率.(2)吸附脱色2 h后氧氢氧化铁的红外光谱中出现了1 033和1 030 cm-1的-SO3Na基团的特征波数,而1 450～1 400 cm-1的偶氮双键的振动吸收峰减弱或者消失,表明偶氮染料分子是通过带负电的-SO3 Na基团吸附到氧氢氧化铁表面,有机还原性配体与氧氢氧化铁表面Fe3 原子中心电荷转移的过程能一定程度上使偶氮键断裂而使染料发生氧化还原脱色.由以上结果推论:两种偶氮染料的脱色是选择性的化学吸附与氧氢氧化铁界面的氧化还原降解共同作用的结果.     

超共轭效应与甲砜的红外特征峰及有关芳砜的晶体结构

文章分为三部分：第一部分,描述通过四圆衍射仪,利用Ｘ射线单晶衍射法,所测得的芳砜ＣＨ３ＣＯＮＨ－Ｃ６Ｈ４－ＳＯ２Ｒ（Ｒ＝－ＣＨ３,－ＣＨ２ＣＯＮＨ２,－ＣＨ２ＣＨ２ＯＨ）的晶体及分子结构结果：第二部分,对分子内键角和键长的测试结果进行分析,证明了甲砜分子内超共轭效应的存在,解释了甲砜分子红外吸收的异性是由甲砜基团内超共轭效应引起的,找到了认证甲砜的红外特征峰,并揭示了超共轭效应的某些特性;第三部分     

Dielectric properties of a hydrated sulfonated poly(styrene-ethylene/butylenes-styrene) triblock copolymer

The present study showed that sulfonated poly(styrene-ethylene/butylenes-styrene) (S-SEBS) triblock copolymer ionomers can be made to exhibit dielectric constants on the order of a hundreds thousand. Although they are too lossy at this point to use as dielectric materials in capacitors or as electrostrictive Maxwell effect transducer materials because of their high hydrogen ion conductivity, the results of these initial dielectric studies as a function of ion content were used to try to understand the effects of a polar plasticizer, water, on dielectric properties of the acid form of this ionomer. This was done before moving on to more tightly bound ions (rather than the hydrogen ions of the sulfonic acid groups used here) and to other polar, less mobile plasticizers (which also interact strongly with the ionic dipoles). The discovery of such high dielectric constants suggested the possibility that low dielectric loss versions of this type of polymer, as well as other members of the class known as ionomers, might find future applications as extremely high dielectric constant materials in capacitors or transducers. Experimental results for films with degrees of sulfonation on the order of 10% or more showed dielectric constants on the order of ?′ ∼ 100,000 but dielectric loss tangents near D = tan δ ∼ 0.3, when the materials were exposed to high humidity conditions. Experiments to determine the effects of water content on the material's dielectric response showed that water can easily move into and out of the films studied and that this transport behavior is strongly correlated to the relative humidity of the environment and to the degree of sulfonation. Water content, in this case, was thus the primary consideration when attempting to understand the observed high dielectric constants in films with degree of sulfonation greater than 5.5%. However, vacuum-dried films were, also, examined and observed to exhibit a dielectric constant on the order of 2 until the degree of sulfonation was greater than 11%. Above this value, the dielectric constant increased by approximately 100% to a value on the order of 4.     

High energy electron irradiation effects on polystyrene films

The effect of an 8 MeV electron-beam on the structural, optical and dielectric properties of polystyrene films has been investigated respectively by means of Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–VIS) spectroscopy and electrical impedance (LCR) analysis over a radiation dose in the range of 50–250 kGy using a Microtron accelerator. The FTIR spectral analysis shows no change in the overall structure of the irradiated polystyrene films, except a minor change in the intensity of a few peaks in the FTIR spectrum, indicating that polystyrene is resistant to electron-beam irradiation over the range of radiation doses investigated. The optical band gap analysis using the UV–VIS absorption spectra of the polystyrene shows a small decrease in the optical band gap (E _g) and the activation energy with an increase in electron doses. Further, the dielectric measurements over a frequency range of 100 Hz to 1 MHz for the electron-beam-irradiated polystyrene films show that both the dielectric constant and the dielectric loss increase with an increase in electron radiation dose, which may be ascribed to the formation of defect sites in the band gap of polystyrene as a consequence of molecular chain scission in the polymer films upon irradiation.     

Surface properties of ionomers based on styrene-b-acrylic acid copolymers obtained by copolymerization in emulsion

Surface properties of styrene-b-acrylic acid copolymers obtained in emulsion and suitable ionomers before and after UV-irradiation were studied by measurements of contact angles and FTIR-ATR spectroscopy.The research focused on the influence of different content of carboxylic acid groups in copolymers, of various types and contents of alkali metal salts in ionomers and of cesium acrylate or methacrylate in ionomers on hydrophilicity of the surfaces of these samples and the course of photodegradation in them.Hydrophilicity of initial copolymer surfaces was higher than this of polystyrene as a result of presence of carboxylic acid groups, which also made the surfaces of these copolymers more sensitive to UV-irradiation.Hydrophilicity of the surfaces of ionomers containing cesium acrylates depended on the content of cesium salt in the samples. The course of ionomer photooxidation was also dependent on the content of this salt.The surface of ionomer containing cesium methacrylate was more polar than this of ionomer containing cesium acrylate.Styrene-based ionomers containing 3.7 mol% of various alkali metal acrylates had less polar surfaces than initial copolymer and they were also more resistant to UV-irradiation in comparison to the initial copolymer.Copolymers obtained in emulsion and suitable ionomers had more polar surfaces and they were more sensitive to UV-light compared to copolymers obtained in bulk and their ionomers.     

镧与半乳糖醇的两种配合物的FTIR和Raman光谱研究

本文用傅里叶变换红外和拉曼（FTIR和Raman)光谱对镧与半乳糖醇形成的两种配合物进行了研究。结果表明镧可以与半乳糖醇形成1：1和2：1两种配合物，它们的红外与拉曼光谱存在着一定的差别，这表明镧与半乳糖确实形成了两种配合物。