Infrared and Raman Spectra of Sulfur-Nitride Complexes of Nickel(II) and Palladium(II)

Abstract

The infrared and Raman spectra of trans-Ni(S₂N₂CH₃)₂ and Pd(S₃N)₂ were measured from 4000-200 cm^?1. The absorption bands were assigned by comparison to the sulfur nitride complexes of nickel(II), palladium(II) and platinum(II). Normal coordinate analyses on these complexes were carried on these data using molecular parameters taken from X-ray data. To aid in band assignments, isotope shift data on trans-⁶²Ni(S₂N₂CH₃)₂ have also been carried out.     

中位-四(4-N甲氧羰甲基吡啶)卟啉锌的表面增强拉曼光谱研究

我们研究了水溶性的中位一四(4-N甲氧羰甲基吡啶)卟啉及其锌配合物的共振拉曼光谱和表面增强拉曼光谱。对其拉曼特征频率作了经验式的归属,同时还研究了溶液酸度对它的表面增强拉曼光谱的影响,并对其表面增强机理进行了初步探讨。     

Sb_xBi_(2-x)Ti_4O_(11)体系的拉曼光谱及软模行为研究

本文合成出了系列样品Sb_xBi_(2-x)Ti_4O_(11),得到了它们在常温常压下的拉曼光谱。实验结果发现:体系在x=0.4和1.2处经历了两次相转变,且相变与“软模”随Sb~(+3)的浓度变化有关。     

Zn_（1－x）Mg_xS_ySe_（1－y）四元半导体合金的拉曼散射光谱研究

用分子束外延方法在ＧａＡｓ（１００）衬底上生长了Ｚｎ１－ｘＭｇｘＳｙＳｅ１－ｙ四元半导体合金薄膜．用Ｘ－射线衍射方法确定了外延层的结构和晶格常数．测量了这些样品在平行和垂直两种不同几何配置下的拉曼散射光谱并对其特性做了研究。从实验上观察到了四类不同的晶格振动模：类ＺｎＳｅ的ＴＯ和ＬＯ模以及类ＺｎＳ和类ＭｇＳ的ＬＯ模，实验发现：在ＺｎＳｅ和ＺｎＳＳｅ中加入Ｍｇ使得类ＺｎＳｅ的ＴＯ和ＬＯ模的振动频率下降；同时，也使类ＺｎＳ模的频率随Ｓ的增加率减小。     

Infrared and Raman Spectra of Some Iodide-Bridged Complexes of Mercury (II)

The IR and Raman Spectra of pentaiododimercurate (II) and octaiodotrimercurate (II) anionic complexes have been obtained in the solid state and interpreted in terms of halogen-bridged structures. Spectroscopic and chemical evidences support a dimeric structure for the pentaiododimercurate (II) anion.

The addition of HgBr₂ and HgI₂ to tetraiodocadmate (II), mercurate (II) and tetrabromocadmate (II) species have also been studied. The vibrational spectra also support halogen-bridged structures for these new mixed binuclear complexes.     

UV-A区段紫外辐射对DNA影响的拉曼光谱研究

检测了小牛胸腺 DNA水溶液经 2 h和 16 h UV- A区段紫外辐射的拉曼光谱。实验结果表明 ,该区段紫外辐射对 DNA的影响要比全波段紫外辐射的影响小得多。主链构象基本上没有受到影响。经过较长时间的 UV- A区段紫外辐射后 ,DNA受到了较轻的损伤。 80 3— 816 cm-1间峰的变化表明 DNA链不同区段的构型处于不断的变化之中。脱氧核糖的特征峰 ,或强度有所下降 ,或峰发生了位移 ,或者两种变化皆有 ,表明 A区段紫外辐射对 DNA的脱氧核糖有所损伤。胸腺嘧啶的 6 81cm-1、75 2 cm-1和 1177cm-1谱线都发生了变化 ,表明胸腺嘧啶也受到了影响。但嘌呤碱基和胞嘧啶基本上没有受到影响。     

Raman Scattering Intensities of the NO2 Symmetric Stretching Vibration Band of Some Aromatic Nitrocompounds (II)

The Raman scattering intensities of the NO₂ symmetric stretching vibration band were investigated experimentally for some para and meta substituted nitrobenzenes. The excitation profiles obtained with the six excitation wavelengths from 457.9 to 514.5 nm were presented. The results were examined in terms of the Albrecht-Hutley's theory, and the electronic states involved in the preresonance Raman intensity enhancement were suggested.     

二(2-乙基己基)磷酸稀土配合物的红外和拉曼光谱

用稀土氯化物与二(2-乙基己基)磷酸反应制备了14种标题配合物,测定了配合物的红外和拉曼光谱,对其主要红外和拉曼谱带进行了归属.结果表明,Ln(DEHP)3应具有与Sm(DMP)3和Pr(DMP)3相同的配位形式和结构类型,每个稀土离子通过双O-P-O桥与邻近的三个稀土离子相连接,形成"双桥二十四元环"的多聚网络结构.Ln-O键基本上是离子键.     

Polarized Laser Raman Spectra of the Crystal Cs3UO2F3

Abstract

Polarized Raman spectra of Cs₃UO₂F₅ in which the UO₂F₅ ^3? ion is in its statistical position have made it possible to assign definitely the Raman fundamental vibration modes as follows : v₁(A′¹) = 784, v₂(A′¹) = 423, v₈(E′²) = 325, v₈(E′²) = 219 and v₁₀(E″¹) = 259 cm^?1.     

四—（对—羟基苯基）卟啉在水／三氟乙酸溶液中J—聚集的光谱研究

本文研究了四－（对－羰基苯基）卟啉（ＴＣＰＰ）在Ｈ２Ｏ／ＣＦ３ＣＯＯＨ、Ｈ２Ｏ／ＣＣＩ３ＣＯＨ和Ｈ２Ｏ／ＣＨ３ＣＯＯＨ溶液中的ＵＶ－Ｖｉｓ吸收光谱、荧光光谱和拉曼光谱。实验表明,ＴＣＰＰ在Ｈ２Ｏ／ＣＨ３ＣＯＯＨ和Ｈ２Ｏ／ＣＣＩ３ＣＯＯＨ溶液中以分子态的Ｎ－质子化卟啉Ｈ８ＴＣＰＰ＾２＋存在,而在Ｈ２Ｏ／ＣＦ３ＣＯＯＨ中则形成Ｈ８ＴＣＰＰ＾２＋的Ｊ－聚集体。Ｊ－聚集体显示,ＵＶ－Ｖｉｓ吸收光谱和荧光光     

Infrared Spectra of the Copper(II), Nickel(II) and Palladium(II) Complexes of 4-amino-3-pentene-2-one

Abstract

The infrared spectra of the metal complexes of 4-amino-3-pentene-2-one were measured from 4000 - 20 cm^?1. The absorption bands were assigned by comparison to other similar molecules: The Cu(II) complex of 4-methylamino-3-pentene-2-one, and complexes of acetylacetone. Force constants for the molecules were calculated using the A_xsm matrix method. The spectra were measured at 298^oK and 77^oK.     

Ca3NbGa3Si2O14(CNGS)晶体的拉曼光谱分析

为了研究CNGS晶体的结构,构造了Ca3NbGa2SiO12和Ca3NbGaSi2O12两个团簇模型,对其构型进行优化并计算了振动频率.利用Raman光谱技术测量了该晶体的Raman光谱,依据理论计算结果对测得的Raman光谱进行了指认,讨论了CNGS晶体的层状结构和压电性能.     

Laser Raman Spectra of Crystalline Chloromercurate(II) Complexes

Abstract

The laser Raman spectra of crystalline [(CH₃)₄N] HgCl₃ and [(CH₃)₄N]₂HgCl₄ have been studied in the 400–20 cm^?1 region. All expected Raman active modes for the HgCl₃ ^? and HgCl₄ ^?2 ions are observed and assignments of the vibrational frequencies are made in relation to the structure of the anions.     

层状铁电体Ba_(1-x)Bi_(2+x)Ti_xNb_(2-x)O_9的结构相变研究

本文应用拉曼光谱方法研究了Ba1-xBi2+xTixNb2-xO9的结构相变。与x≠0的情况相比,x=0的情况BaBi2Bn2O9表现出了明确不同的拉曼光谱。前者有与Aurivillius层状铁电体家族的铁电相相似的拉曼光谱。因此认为BaBi2Nb2O9发生了铁电—非铁电相变。此外,用内模方法对层次铁电体Ba1-xBi2+xTixNb2-xO9的拉曼振动模式进行了初步的指认     

Bi2Sr2CaCu2O8+δ体系中顶点氧振动的Raman谱研究

通过Raman散射声子谱研究了Pr掺杂对Bi2212体系顶点氧振动频率的影响,发现掺杂导致振动频率向低频方向移动.分析表明体系中BiO双层收缩是导致声子发生软化的主要原因.结合体系的结构特征,从能量关系角度上讨论了BiO双层随掺杂发生收缩的原因.     

Non-Destructive In-Situ Study of White and Black Coating on Painted Pottery Sherds From Bancun Site (Henan,China) by Raman Microscopy

Abstract

Pottery sherds from the archaeological site of Bancun (Henan, China) were analyzed by Raman microscopy and the pigments used in the coating of this ancient (c. 4000–5000 BC) pottery were determined. It was found that bauxite was used to make the white pigment. The black coating was identified as a magnetite and its particle size was in the nanometer range. This work also showed that the size of pigment had influence on the color of the coating. In principle, Raman spectra could be used not only to identify the mineral source of the pigment but also to estimate the particle size of the pigments.     

高温高压下水溶液中硫酸根离子浓度的拉曼光谱定量测定研究

当前,拉曼光谱通常被应用于定性研究,拉曼光谱的定量研究明显不足。通过理论分析,拉曼光谱的定量研究应当基于其相对强度来进行。据此,通过对三种不同浓度的Na2SO4溶液进行拉曼光谱分析,得到了常温常压下水溶液中SO2-4离子浓度的定量方程为:c(SO2-4)=4.779 6R(r2=0.999 4)。此外,对高温高压下硫酸根水溶液的拉曼光谱也进行了研究。光谱分析表明,温度和压力将影响拉曼谱峰强度比值与SO2-4浓度的关系。高温高压下水溶液中SO2-4浓度的定量方程为:c(SO2-4)=4.779 6(R+1.469×10-4ΔT+1.340×10-4ΔP),式中c(SO2-4)为待测溶液中SO2-4的浓度,R为拉曼谱峰强度的比值R(SO2-4/H2O),ΔT为相对于常温(23℃)时的温度差,ΔP为相对于常压(0.1MPa)时的压力差。该方程适用的温度范围为23℃≤T≤360℃,浓度范围为0.5~1.5mol·L-1,测量的相对误差为6.5%。对于具有拉曼活性的物质,拉曼光谱实验技术可以用来进行水溶液中物质浓度的定量研究。     

Fourier Transform Infrared and Raman Spectra of 4-Vinylpyridine and its Transition Metal(II) Tetracyanonickelate Complexes

Abstract

Infrared and Raman spectra (4000-200 cm^?1) were recorded for 4-vinylpyridine and vibrational assignments made for fundamental modes on the basis of frequency shifts of the coordinated ligand, of the group vibrational concept and comparison with the assignments for related molecules. the infrared spectra of M(4-vinylpyridine)₂Ni(CN)₄ (M=Mn, Cd, Fe, Co, Ni or Cu) are reported.     

Electronic and Resonance Raman Spectra of the Hexanuclear Cluster [Ru30(02CCH3)6 {(pyrazine)Ru(NH3)5}3 6+

Abstract

The trinuclear [Ru³0(00CCH³)⁶, (pyrazine)³] cluster reacts with pentaammineruthenium(II) ions, yielding a hexanuclear pyrazine bridged complex. The hexanuclear cluster exhibits a broad absorption band around 1000 nm and a strong band at 533 nm, ascribed to metal-metal and metal-pyrazine charge transfer transitions, respectively. Excitation at the visible band leads to the enhancement of the totally symmetric vibrational modes of pyrazine at 1605, 1230, 1085 and 700 cm?¹, and of a vibrational peak at 335 cm?¹, ascribed to the Ru(peripheral)-N(pyrazine) stretching mode. The spectroscopic data are consistent with a weak coupling between the central and peripheral ruthenium ions.     

Nd_2O_3纳米粉的拉曼光谱研究

测量了 Nd2 O3纳米粉的拉曼谱 ,发现随着颗粒尺寸的减小 ,其拉曼谱峰发生红移 ,同时谱峰发生不对称变宽 ,并用量子尺寸效应对这种现象进行了解释