IR-Spectral Study of 2-Aminopyridine and Aniline Complexes with Palladium (II)

An IR-spectral study of sulphato- and chloro complexes of palladium (II) with 2-aminopyridine and aniline, respectively, is reported. The results obtained confirm the bidentate co-ordination of both 2-aminopyridine and SO₄ group in the case of sulphato-2-aminopyridine-palladium (II) leading to polynuclear structure of the complex in solution. The comparative investigation of sulphato-dianiline-palladium (II) suggests that the self-dependent ability of the SO₄ ^2- ion for bridging co-ordination can stabilize chain-like complexes of palladium (II) only in the solid state.     

IR- and UV-Spectral Study on the Mechanism of 2-Aminopyridine Complexation with Palladium (II)

Abstract

The IR-spectra of Pd (II) complexes with 2-aminopyridine, obtained both in sulphuric acid and alkaline solution are studied in the region 1700- 1400 cm^?1. The structural conclusions are based on comparison with the IR- and UV-spectra of the free ligand and aminopyridinium sulphate, as well as of trans-dichloro-di-2-aminopyridine-palladium and deuterated at the amino group analogues of the investigated compounds.     

IR- and UV-Spectral Study of Palladium(II) Complexes with 2-Aminopyridine Obtained in Sulphuric Acid and Alkaline Solutions

When obtained in sulphuric acid medium sulphato-2-aminopyridine-palladium (II) complex has a polynuclear structure, with a bridging coordination of both the sulphato-group and 2-aminopyridine. The complex keeps its polynuclear structure in alkaline solution, in which the substitution of sulphato ions by hydroxylic groups yields hydroxo-2-aminopyridine-palladium (II). The compounds discussed are the main components of activators used in currentless metallization of nonconducting surfaces.     

IR-Spectral Study of 4′-Substituted Phenylthiolbenzoates in Solution

A doublet structure of the C=O stretching band in the IR-spectra of 4′-methoxy-, 4′-methyl-and 4′-cyanophenylthiolbenzoate is proved. The solvatochromic effect on the intensities of both components suggests an equilibrium between two conformers with different dihedral angle determined by the plains of the benzene rings. The choice of the studied compounds is influenced by the fact that they are structural fragments of liquid crystals. The characterization of their rotameric preference in solution provides additional information about the influence of the terminal groups on the conformational mobility of the phenylthiolbenzoate skeleton as well as on the polarizability of the molecule.     

Spectroscopic Studies of Oxygen-Bridged Copper (II) Cluster Complexes; (I) Dimeric Copper (II) Complexes of 2-Aminopyridine and Pentane-2,4-Dionate

X-band E.P.R and also the far infrared spectra of alkoxy-bridged dimeric copper (11) complexes of 2-aminopyridime and pentane-2, 4-dionate were recorded and the two sets of data thus obtained have been correlated.

The E.P.R spectra were analysed in terms of an axial (S=1) spin Hamiltonian. Zero-field splitting parameter (D) was calculated for each complex and an attempt was made in order to correlate the obtained values with the magnetic coupling constants (J) of some compounds with analogous structures.

An assignment has been made of the bands related to the central Cu202 bridging skeleton and the observed similarity in the frequency magnitude of a strongly CuOCu angle dependent mode has been proposed to arise from nearly equal angles in the seri of complexes.

The correlative results indicated in the above have therefore enabled the identification of a ferromagnetic exchange mechanism in the seri of complexes with J values larger than 242.5 cm-1.     

IR-Spectra of M2UO2F4.H2O Complexes

This work is devoted to the study of and Rb₂UO₂F₄.H₂O and Cs₂UO₂F₄. H₂O IR-spectra with the aim of obtaining a set of vibration frequencies characterising M₂U0₂F₄.H₂O complexe elucidating the role and nature of water bonds in the structures of the above-mentioned compounds; and receiving preliminary information on the structure of M₂UO₂F₄.H₂O. The investigated compounds were synthesized in accord with our previous paper¹. M₂UO₂D₂O and M₂UO₂F₄.HDO were obtained by recrystallizing M₂UO₂F₄.H₂O from D₂O and HDO respectively     

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。     

Iterative Solution for Groundstate of H＋2 Ion

To solve the wave functions and energies of the groundstate of H＋2 ion an iteration procedure for N- dimensional potentials is applied. The iterative solutions are convergent nicely, which are comparable to earlier results based on variational methods.     

IR-Spectral Study of Solid State Complexes of Lanthanum with Mono-and bis-(2-Ethylhexyl) Phosphoric Acids

IR-spectra of the solid state lanthanum complexes with mono-and bis-(2-ethylhexyl) phosphoric acids (H₂B, resp. HA) are studied. It is confirmed that La coordinates HA as LaO₆-octahedra, connected through -La-O-P-O-La-bridging bonds. The so fixed polynucleous chains form the crystal structure of the complex. The obtained IR-spectral data as well as the results of the X-ray powder diffraction analysis show that La forms shorter polymeric chains than the other rare earth complexes of the same type.

Certain methods for the synthesis of the solid state complexes of La with H₂B (studied for the first time) are considered. It is shown that the structure of La-HB-complexes is consituted also by LaO₆-octahedra, resp.-La-O-P-O-La-polymeric chains. However they are binded through crosswise PO—H., O(H)-P hydrogen bonds, owing to the non-deprotonized hydroxo-group presented in the complex. The so formed supramolecular structure has to be more disordered than the one in the case of the complexes with HA. This determines the amorphous (nanocrystalline) state of the H₂B-complexes and, probably, their abiliity to coordinate water as well.     

用CH3CSNH2钝化GaP表面特性的研究

借助扫描电子显微镜（ＳＥＭ）、Ｘ光电子能谱仪（ＸＰＳ）研究在不同处理条件下,ＧａＰ晶片表面硫化物钝化对其结构、形态以及表面形貌的影响。实验结果表明：经过ＣＨ３ＣＳＮＨ２溶液一定时间钝化处理后,ＧａＰ表面氧化物基本消失,形成薄的硫化物钝化层和较强的Ｇａ—Ｓ、Ｐ—Ｓ键,并引起Ｘ光电子能谱的Ｇａ、Ｐ芯能级化学位移,Ｇａ的硫化物有较好的稳定性。     

NTO及其铷盐水溶液光谱研究

用Raman光谱和FTIR光谱对NTO晶体和不同pH值的水溶液以及配合物Rb(NTO)·H₂O的水溶液进行了研究。从已测定的单晶结构表明金属离子与NTO-的CNO,CO基团和水分子中的氮、氧原子键合。Raman和FTIR光谱特征的主强峰也表明是在NTO-的CNO₂和CO基团的氧和氮原子与金属离子形成弱配位键。该配合物饱和水溶液的振动光谱峰与晶体的振动光谱峰基本上吻合。表明该配合物在水中键合未发生变化,因而NTO的碱金属配合物在水溶液中的振动光谱峰归属可以用晶体中键的形成来说明。讨论了金属离子与NTO必需在碱性水中才能形成NTO的金属配合物机理。     

低能离子对酪氨酸溶液损伤作用的光谱研究初报

利用气体我放电产生低能离子,其在放电间隙的电场加速下撞击水溶液样品。了低能离子作用后酪氨酸溶液的紫外及红外吸收光谱的变化。结果表明,气体放电产生的离子对Ｔｙｒ造成了多种损伤。不仅使化学键断裂,分子解体,而且外来的活性离子会与溶液中的元素形成新的化学基团,妆在受损伤分子碎片上组成新的损伤物质,充分体现了低能离子与物质相互作用的“离子沉积”效应。     

Temperature Dependence of Integrated Intensity Bands in IR-Absoption Spectra of (NH4)2AF6 Complexes

The contribution refers to the temperature dependence of IR-absorption spectra (NH₄)₂AF₆ (A - Si and Ge). It is found that with temperature decreasing, the integrated intensities of the bands corresponding to anion fundamentals, increase, while those of cation, decrease. An explanation is given to the phenomena detected, which is based on variations in the strength of the outer-sphere interaction with the temperature, and subsequent redistribution of electron density.     

A Spectroscopic Study of Outer-Sphere Interaction in M3UO2F5 Complexes

The data available in literature on the vibration spectra of complex uranyl compounds indicate that the stretching vibration frequencies of the UO²⁺ ₂ group depend not only on the composition of the coordination sphere, but also on the outer surrounding of the complex anion. The outer-sphere cation, in case of uranyl complexes, acts as a competitor of the uranyl group to form bonds with, ligands. At the same time, as a result of decrease in the electron density localised on the U-F bonds, the strength of these bonds becomes less.     

Cu2+对luminol-碱性水溶液声致荧光的影响

实验表明,Ｃｕ＾２＋增强了ｌｕｍｉｎｏｌ－ＮａＯＨ水溶液和ｌｕｍｉｎｏｌ－Ｃａ（ＯＨ）２水溶液的声致荧光强度,并使这两种水溶液的最大声致荧光峰分别发生了６ｎｍ和９ｎｍ的红移;Ｃｕ＾２＋减弱了ｌｕｍｉｎｏｌ－Ｎａ２ＣＯ３水溶液的声致荧光强度,并使其最大声致荧光几发生了５ｎｍ的蓝移;但是,Ｃｕ＾２＋并未对上述三种溶液的声致荧光的发射波长范围３７０￣７５０ｎｍ产生明显影响。上述结果至少可以证明,这三种ｌ     

CexZr1-xO2固溶体储氧性能与结构的关系

采用加热回流技术制备了系列CexZr1-xO2(0.25≤x≤1)固溶体,通过N2物理吸附、XRD、Raman光谱、UV-Vis漫反射光谱表征了不同铈锆组成的铈锆复合氧化物结构对储氧性能的影响.结果表明,在铈锆组成比不同的样品之间,结构性质相差较大,随着载体中ZrO2 mol%的增加,载体结构从相对的有序经无序再回到相对的有序.Ce0.4Zr0.6O2样品具有最高的储氧性能,而Ce0.25Zr0.75O2样品具有较高的热稳定性.     

Algebraic-Geometric Solution to （2＋1）-Dimensional Sawada-Kotera Equation

Special solution of the （2＋1）-dimensional Sawada Kotera equation is decomposed into three （0＋1）- dimensional Bargmann flows. They are straightened out on the Jacobi variety of the associated hyperelliptic curve. Explicit algebraic-geometric solution is obtained on the basis of a deeper understanding of the KdV hierarchy.     

外界光对ZnCl2溶液激光拉曼光谱的影响

对ZnCl2溶液在不同外界环境光存在下的激光拉曼光谱的影响进行了探讨.研究表明不同的外界环境光,自然光和室内荧光灯光,都会对拉曼光谱产生干扰效应,存在着特征谱线,倒峰或尖锐正峰.虽干扰表现不同,但都有影响,不能忽略.因此,在进行溶液拉曼光谱检测时,需在暗室或暗罩中进行,以完全隔离外界环境光的影响.     

二维相关红外光谱研究4-氨基吡啶/甲基丙烯酸分子间相互作用

采用二维相关红外光谱方法研究了4-氨基吡啶和甲基丙烯酸分子问相互作用.一维红外光谱难以直接反映4-氨基毗啶和甲基丙烯酸分子间相互作用的类型和键的关联,而二维相关分析结果清晰表明4-氨基吡啶和甲基丙烯酸分子间存在的相互作用.研究中发现1298和1 202 cm-1归属于甲基丙烯酸的-OH伸缩振动峰与1 531 cm-14-氨基吡啶的C=N伸缩振动峰存在同步交叉正峰,3 382和3 212 cm-1属于4-氨基吡啶的氨基N-H伸缩振动峰与1 705 cm-1归属于甲基丙烯酸的羰基伸缩振动峰存在同步交叉正峰.根据二维相关规则,4-氨基吡啶的C=N峰与甲基丙烯酸的-OH峰、4-氨基吡啶的氨基N-H峰与甲基丙烯酸的羰基峰有很强协同作用.结果表明4-氨基吡啶的C=N与甲基丙烯酸的-OH存在静电作用,4-氨基吡啶的氨基与甲基丙烯酸的羰基存在氢键作用.二维红外光谱是研究分子内、分子间相互作用的一种强有力的手段.     

基于组分Ca2Pr2Cu5O10三元固溶区的范围和晶体结构

 利用X射线衍射分析和Rietveld结构精修方法研究了基于组分Ca₂Pr₂Cu₅O₁₀三元固溶区的范围和晶体结构。根据X射线分析结果和相消失法，为了保持Ca_2+xPr_2-xCu₅O₁₀结构单位晶胞中恒定的氧含量和电价平衡，基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶区的范围可确定为：在Ca_2+xPr_2-xCu₅O₁₀固溶区的富Ca区（Ca/Pr>1），其表达式仍可以表示为一般的化学计量式Ca_2+xPr_2-xCu₅O₁₀（x=0.4, 0.2, 0）；在富Pr区（Ca/Pr<1），其表达式为Ca_1.7Pr_2.2·Cu₅O₁₀、Ca_1.4Pr_2.4Cu₅O₁₀，即：Ca_2+xPr_2-xCu₅O₁₀固溶区范围从Ca_2.4Pr_1.6Cu₅O₁₀至Ca_1.4Pr_2.4·Cu₅O₁₀。研究表明：基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶体晶体结构可以看作是正交晶系NaCuO₂型亚晶胞的无公度相；Ca_2.4Pr_1.6Cu₅O₁₀亚晶胞的点阵常数为a₀=0.282 46(7) nm，b₀=0.636 93(1) nm，c₀=1.067 94(1) nm；其正交超结构的点阵常数为a=5a₀，b=b₀，c=5c₀。Ca_2.4Pr_1.6Cu₅O₁₀的结构也可以用单斜超晶胞来表述，该单斜超晶胞的空间群为P2₁/c，Z=4，a=5a₀，b=b₀，c=c₀/sin β，β=104.79°或136.60°，V=5a₀b₀c₀。在基于组分Ca₂Pr₂Cu₅O₁₀的三元固溶体晶体结构中，Ca和Pr之间在一定范围内是可以相互替代的，而且它们在结构中的占位是无序的。