[OsⅥ(N)(NH3)4](CF 3SO3)3电化学还原过程的原位FTIR光谱研究

运用原位FTIRS,UV/Vis和电化学方法研究了乙腈溶液中[Os Ⅵ(N)(NH3)4](CF3SO3)3在GC和Pt电极上的还原过程 .结果首次在Pt电极上检测到桥氮物种ν(N≡N)的红外谱峰,位于2 019和1 970 c m-1附近,分别指认为[Ⅲ,Ⅱ]和[Ⅱ,Ⅱ]混合价桥氮锇络合物.为进一步探讨桥氮偶联过程提供了新的谱学数据.     

[Fe（bpy）3]（ClO4）3与Na2SO3在室温下的固相氧化还原反应

本文研究室温下〔Ｆｅ（ｂｐｙ）３〕（ＣｌＯ４）３．３Ｈ２Ｏ与Ｎａ２ＳＯ３发生的固－固相氧化还原反应。用Ｍｏｓｓｂａｕｅｒ谱、ＸＲＤ、ＩＲ、元素分析和磁化率测定等手段表征了反应２４ｈ后的固相产物，并采用反应截面移动法研究了等温因相反应动力学、结果表明，室温下该反应速度较快，反应进行完全。     

在N2中[VnCr3—n（μ3—O）（μ—O2CCH3）6（THF）3]X[n=0—3,X=Cl^—1,ClO4^—,（VO5）0.5^—]及[VnFe3—n（μ3—O）（μ—O2CCH3）6（THF）3]X（n=0—3,X=Cl^—1）

The reaction behavior of the title complexes have been investigated by means of in situ IR in nitrogen atmosphere. It has been found that they enabled the acetic acid to convert to acetone and methane in different temperatures. The results indicate that the sequence of the ketonization reaction activity for the clusters was [V3OAT] > [VFe2OAT], [V2CrOAT] > [Fe3OAT], [VCr2OAT] > [Cr3OAT] [OAT = (mu 3-O) (mu-O2CCH3)6 (THF)3], and the sequence of the methanation reaction activity for the clusters was [Cr3OAT] > [VCr2OAT], [V2CrOAT] > [V3OAT] > [VFe2OAT], [Fe2OAH]. The ketonization reaction activity of [Fe3OAT] were obviously lower than that of [Fe3OAH] [OAH = (mu 3-O) (mu-O2CCH3)6 (H2O)3] and the methanation reaction activity of [Cr3OAT] were also much lower than that of [Cr3OAH]. The difference between [Fe3OAH], [Cr3OAT] and [Fe3OAH], [Cr3OAH] mentioned above were discussed.     

富电子膦硫混配钴簇合物Co6S8[P（OCH3）3]6的电化学研究

利用循环伏安法研究了膦硫混配原子簇化合物Ｃｏ６Ｓ８「Ｐ（ＯＣＨ３）３」６的电化学行为,结果表明Ｃｏ６Ｓ８「Ｐ（ＯＣＨ３）３」６在ＣＨ２Ｃｌ２训可观察到三个可逆氧化还原过程,其电子转移过程为;Ｃｏ６Ｓ８「ｐ（ｏｃｈ３）３」６－＝＾（－Ｅ,＋Ｅ）Ｃｏ６Ｓ８「Ｐ（ＣＯＨ３０３」６ｙ０＝（＾－ｅ,＋ｅ）Ｃｏ６Ｓ８「Ｐ（ＯＣＨ３）３」６＾＋＝＾（－ｅ,＋ｅ）Ｃｏ６Ｓ８「Ｐ（ＯＣＨ３）３」６＾２＋并探讨了其电     

在N2中［VnCr3－n(μ3-O)（μ-O2CCH3）6（THF）3］X［n＝0－3，X＝Cl－，ClO－4，（VO5）－0.5］及［VnFe3－n（μ3-O）（μ-O2CCH3）6（THF）3］X（n＝0－3，X＝Cl－）反应行为的原位红外光谱研究

利用原位红外光谱研究标题化合物在N2中的反应行为。发现它们在不同温度下能使乙酸分别转化为丙酮和甲烷。它们对乙酸的丙酮化反应活性顺序：［V3OAT］＞［VFe2OAT］，［V2CrOAT］＞［Fe3OAT］，［VCr2OAT］＞［Cr3OAT］［OAT＝（μ3-O）（μ-O2CCH3）6（THF）3］。它们对乙酸的甲烷化反应活性顺序：［Cr3OAT］＞［VCr2OAT］，［V2CrOAT］＞［V3OAT］＞［VFe2OAT］，［FeO3OAT］。对乙酸的丙酮化反应活性［Fe3OAT］明显低于［Fe3OAH］［OAH＝（μ3-O）（μ-O2CCH3）6（H2O）3］。对乙酸的甲烷化反应活性［Cr3OAT］也明显低于［CrOAH］。并对上述［Fe3OAT］，［Cr3OAT］与［Fe3OAH］，［Cr3OAH］之间差异进行了讨论     

铕吡啶羧酸配合物[Eu（C7H3O4N）（CH3COO）（H2O）]·2H2O的合成、表征及其结构

在水热条件下,以2,5-吡啶二甲酸为配体合成得到稀土Eu^3＋为中心离子的配位聚合物[Eu（C7H3O4N）（CH3COO）（H2O）]·2H2O。用元素分析、红外光谱、单晶衍射对配合物的组成和结构进行了表征。晶体结构测试表明,标题配合物属于单斜晶系,空间群为P2（1）/c。在晶体结构中,构筑单位是含有Eu-Eu金属键的双核重复单元,六分子的吡啶二甲酸配体均以五齿配位的形式桥连4个Eu^3＋离子,从而将邻近的双核单元连接起来形成三维结构。     

用简并四波混频对聚[3''''-甲基-4''''-二(N,N-氧亚乙基)胺基-4-硝基偶氮苯癸二酰]薄膜三阶非线性光学性质、光信息储存及光致异构过程的研究

通过简并四波混频法（DFWM）对“聚［3’-甲基-4’一二（N，N-氧亚乙基）胺基-4-硝基偶氮苯癸二酰］”薄膜的三阶非线性光学性质进行了研究，测得其三阶非线性系数X[3]达到6．6×10－5esu．通过EFWM，测得样品有很强的光信息储存，另外通过对材料的光致异构过程的研究，测得在上升和下降过程中相位共轭光Ipc与时间t均满足确定的关系式，并与文中所推的理论相符．     

用简并四波混频对聚[3’-甲基-4’-二(N,N-氧亚乙基)胺基-4-硝基偶氮苯癸二酰]薄膜三阶非线性光学性质、光信息储存及光致异构过程的研究

通过简并四波混频法(DFWM)对“聚[3’-甲基-4’一二(N,N-氧亚乙基)胺基-4-硝基偶氮苯癸二酰]”薄膜的三阶非线性光学性质进行了研究,测得其三阶非线性系数X⁽³⁾达到6.6×10^-5esu.通过EFWM,测得样品有很强的光信息储存,另外通过对材料的光致异构过程的研究,测得在上升和下降过程中相位共轭光I^pc与时间t均满足确定的关系式,并与文中所推的理论相符.     

81Br NQR Study of [NH3(CH2) n NH3]CdBr4 (n = 4 and 5) and [NH3(CH2) n NH3]ZnBr4 (n = 5 and 6)

⁸¹Br NQR frequencies and differential scanning calorimetry (DSC) were measured as a function of temperature. [NH₃(CH₂)₄ NH₃]CdBr₄ (1) and [NH₃(CH₂)₅NH₃]CdBr₄ (2) showed a doublet and quartet ⁸¹Br NQR spectrum, respectively. [NH₃(CH₂)₅NH₃]ZnBr₄ (3) and [NH₃(CH₂)₆NH₃]ZnBr₄ (4) exhibited a four-line ⁸¹Br NQR spectrum. From the NQR results, it is inferred that (1) and (2) consist of infinite two-dimensional sheets of corner-sharing CdBr₆ octahedra, whereas (3) and (4) have isolated [ZnBr₄]²⁻ tetrahedra. All of the crystals except (1) showed at least one structural phase transition above 380 K.     

The thermoelastic properties of [N(CH3)4]2ZnBr4 and [N(CH3)4]2MnBr4

The ferrodistortive phase transition in the bis-tetramethylammonium tetrabromide crystals below room temperature is studied within the framework of the Landau theory. The specific heats of [N(CH₃)₄]₂MnBr₄ and [N(CH₃)₄]₂ZnBr₄ are correctly described down to 40°C below the transition temperature. The phenomenological parameters are determined from calorimetric results, elastic constants and thermal expansion data. Using these coefficients, the monoclinic angle in the ferrodistortive phases is obtained. The anharmonic quantities, such as the isothermal compressibility, calculated from the specific heat data, are in good agreement with the values derived from the elastic measurements.     

Optical studies of the ferroelastic phase transitions in Rb3H(SeO4)2, (NH4)3H(SO4)2 and (NH4)3H(SeO4)2

Optical observations of growth twins and ferroelastic domains and measurements of the rotation of the optical indicatrix were carried out for Rb₃H(SeO₄)₂ and (NH₄)₃H(SO₄)₂ using an optical microscope. Taking into account the symmetry reduction from the rhombohedral (Rm) to the monoclinic phase (B2/a) the occurrence of domains and growth twins can be well described. The orientations of oblique ferroelastic walls are well determined by the spontaneous strains ^s e ₁₁ and ^s e ₂₃ at room temperature.     

Raman and infrared spectral studies of [C(NH2)3]2MII(H2O)4(SO4)2, MII = Mn,Cd and VO

The Raman and FTIR spectra of three metal guanidinium sulfates, [C(NH₂)₃]₂M^II(H₂O)₄(SO₄)₂, (M^II = Mn, Cd and VO), are recorded. The observed spectral bands are assigned in terms of the fundamental modes of vibration of the guanidinium ions, sulfate groups and water molecules. The appearance of the sulfate tetrahedra's ν₁ and ν₂ modes in the IR spectra and the partial lifting of the ν₄ mode in the Raman spectra indicate the distortion of the SO₄²⁻ tetrahedra in the structure, so that its symmetry is lowered from T_d to C₁. The geometry of the sulfate group in guanidinium vanadyl sulfate does not deviate much from that of the average sulfate group. The distortion of the SO₄ tetrahedra is stronger in GuCds than in GuMnS. The CN₃ group in the guanidinium ion is planar (D_3h point group) in GuCdS and GuMnS, whereas it is lowered in the vanadyl compound. Furthermore, the spectral analyses show the presence of weak hydrogen bonds in the structures. Copyright © 2007 John Wiley & Sons, Ltd.     

Temperature dependence of EPR in [Ni(C3H4N2)6](NO3)2

Paramagnetic crystal of hexaimidazole nickel nitrate is studied by EPR at Q-band frequency (35.768 GHz). Well defined temperature dependence of the zero-field splitting is obtained at the perpendicular orientation of the trigonal axis,cΛB. An inversed EPR signal is observed in the powder spectrum of the compound.     

Vibrational Spectra of [Zn(15NH3)4] (ReO4)2 and [Cd(NH3)4] (ReO4)2 With 110Cd/116Cd and H/D Isotopic Substitution

The infrared spectra of the zinc tetraammine with ¹⁵N, and cadmium tetraammine perrhenates with ¹¹⁰Cd/¹¹⁶Cd and H/D isotopic substitution, provides useful data in determining skeletal pseudo - exact force constants. An approximate set of force constants in the F₂ symmetry class for the whole complexes were obtained.     

Light scattering studies of phase transitions of (NH4)2SO4-type crystals

The mechanism of the ferroelectric transition of pure and rubidium-doped ammonium sulfate is investigated by means of Raman, Brillouin and dielectric measurements. The study contributes to spectroscopic evidences of temperature anomalies of lattice vibrations in the paraelectric and ferroelectric range. The different behaviour of rubidium-doped crystals with respect to their dielectric and elastic properties at the transition is interpreted as an indication that different order parameters might become active in this first order transformation.