H2TP(o-NO2)TBP及其锌和钴配合物的光谱电化学研究

采用循环伏安以及电化学和电子吸收光谱联用技术研究了邻硝基四苯并卟啉（H2TP（o-NO2)TBP）及其锌和钴配合物在DMF介质的中氧化和还原性质。结果表明H2TP（o-NO2)TBP及其锌配合物的氧化和还原均发生于卟啉的大环π电子结构,伴随有紫外-可见光谱的明显变化,氧化和还原过程为可逆。钴配合物的第一氧化和还原均发生于中心金属离子,第二氧化发生于卟啉的大环π电子结构。     

酰胺基卟啉的制备,光谱及电化学性质研究

合成了未见文献报道的5-(4-异烟酸酰亚胺基)苯基-10,15,20-三苯基卟啉配体(H2P)及其锌配合物(ZnP),并通过紫外-可见光谱、红外光谱、核磁共振氢谱、元素分析等测试方法对化合物的结构加以确认.研究表明,配体和配合物的拉曼光谱有很大区别,卟啉配体的循环伏安曲线与氨基卟啉和锌配合物不同,卟啉环的氧化还原峰位都有移动.差热研究表明,卟啉配体410oC开始分解,显示了很高的热稳定性.     

单取代色氨酸四苯基卟啉及其配合物的合成、结构表征及催化性质研究

模拟细胞色素 P- 4 5 0的活性中心金属卟啉及周围氨基酸残基的结构 ,研究以其共轭大 π电子体系和中心金属原子价改变为基础的金属卟啉的氧化还原性质 ,以及中心金属对轴向配体的配位能力是当前人们感兴趣的课题[1 ] 。本文报道了 5 - [(对 - N-色氨酸丁氧基 )苯基 ]- 10 -15 - 2 0 -三 (对氯苯基 )卟啉及其铁、钴、锰配合物的合成、结构表征和对芳醛的催化氧化行为。实　验　部　分合成1.色氨酸四苯基卟啉 (H2 L )的合成 :　按文献 [2 ]先合成单对羟基卟啉 (收率 4 .2 % ) ,再与1,4二溴丁烷反应得单对溴丁氧基四苯基卟啉 (收率 6 0 % ) ,…     

四苯骈卟啉及其金属配合物的合成

卟啉类化合物作为电子给体在光合作用模拟研究中占据着重要位置 ,在卟啉环上引入供电子基团以增大共轭体系 ,常有利于卟啉环的给电子作用 ,过去常用的卟啉化合物为四苯基卟啉及其衍生物 ,但由于空阻作用 ,四个亚甲基上的苯基不能很好与卟啉环共平面而降低了共轭效应 ,为了寻求一种更有利于卟啉环共轭大Π键形成的结构 ,我们合成了比四苯基卟啉共平面效果更好的卟啉化合物———四苯骈卟啉 (Ｈ2 ＴＢＰ)及其与Ｎｉ2 + 、Ｃｏ2 + 、Ｚｎ2 + 的金属配合物以及研究它的给电子作用效果。四苯骈卟啉配合物早在 1 92 8年就为人们所认识[1] ,但其研…     

水溶性四(p-磺酸钠苯基)金属卟啉配合物的合成、光谱性质及催化三氯苯酚的氧化脱氯反应

通过四苯基卟啉(H2TPP)和浓硫酸发生磺化反应及其金属化, 控制反应体系pH并利用透析法纯化, 高效合成了水溶性四(对磺酸钠苯基)卟啉(H2TPPS)及其金属配合物(FeTPPS和ZnTPPS); 采用UV-Vis、荧光、1H NMR和FTIR等光谱手段表征及研究了水溶性卟啉的结构及性质. 结果表明, 磺酸根离子的存在增强了卟啉分子间的π-π作用, 从而使H2TPPS及其金属配合物的分子间聚合作用增强. 研究了FeTPPS对2,4,6-三氯苯酚(TCP)催化氧化脱氯反应, 结果表明, FeTPPS/H2O2催化体系对TCP具备很好的催化氧化脱氯性能, 2,6-二氯对苯醌的转化数达到了766.     

5,10,15,20-四(对-十四酰亚胺基苯基)卟啉及其锰、锌配合物的合成及性质

合成了5,10,15,20-四(对-十四酰亚胺基苯基)卟啉配体(TMPPH2)及其锰、锌金属配合物(TMPPMnCl, TMPPZn), 并通过紫外-可见光谱、红外光谱、核磁共振氢谱、元素分析等技术对化合物的结构加以确认, 研究了配体和配合物的拉曼光谱、光电子能谱和荧光光谱的变化及电化学性质. 结果表明, 配体和配合物的紫外光谱、红外光谱、拉曼光谱、荧光光谱及光电子能谱都有很大区别, 锰配合物的循环伏安曲线与配体和锌配合物不同, 除了卟啉环发生氧化还原外, 还发生了金属离子的氧化还原反应.     

四苯基（2—硝基）卟啉金属配合物的XPS研究

用XPS研究了四苯基(2-硝基)卟啉及其过渡金属化合物。由π→π跃迁能、跃迁几率及N_(1S)和金属M_(2p3/2)结合能的位移证明,这些化合物是金属镶嵌在大π体系共轭环中而成的金属配合物。其中,—NO_2是连在卟啉环上。引入—NO_2后,金属结合能升高,Lewis酸性增强,因而与轴向配位体的加合能力增强。     

四萘基四苯并卟啉钴的合成,表征和电化学行为

合成了四萘基四苯并卟啉钴配合物（ＴＮＴＢＰＣｏ）．用元素分析、紫外可见光谱、红外光声光谱，核磁共振氢谱、摩尔电导进行了表征．用循环伏安法研究了ＴＮＴＢＰＣｏ的电化学性质．结果表明，钴卟啉配合物中心离子由正三价还原为正二价的半波电位为－０．２５５Ｖ，由正二价还原为正一价的半波电位为－１．１７５Ｖ，卟啉环还原的半波电位为－１．８５０Ｖ，三步电极反应均可逆．     

锌配合物Zn(phen)(H2O)(3-mba)2的合成、结构表征及荧光性质

常温下,溶液法合成了一个单核结构的锌配合物Zn (phen)(H2O)(3-mba)2(phen:邻菲咯啉;3-Hmba∶3-甲基苯甲酸),并用红外光谱、元素分析、热重分析以及X射线单晶衍射表征了其结构.结果表明,配合物属于三斜晶系,空间群P1,晶胞参数:a=10.893(2)(A),b=11.461(2)(A),c=11.505(2)(A),α=95.54(3)°,β=115.80(3)°,γ =100.25(3)°,V=1247.9(4) (A)3,C28H24N2O5Zn,Mr=533.86,Z =2,Dc=1.421 g·cm-3,F(000) =552,最终偏离因子[I≥2σ(I)]R1=0.0471,wR2 =0.0954.在配位物分子中,中心锌离子是五配位模式,双分子间先通过O—H…O氢键形成二聚体,继而二聚体间通过相邻分子中的邻菲咯啉芳环的π-π堆积作用沿着a方向形成了一维超分子链.对配合物的荧光性能进行了测试.CCDC 1023439.     

吸电子取代基(2-硝基)金属卟啉的轴向加合反应的研究

本文报道了用电子吸收光谱和电化学方法系统地研究卟啉环上具有吸电子取代基(—NO_2)的四苯基卟啉[H_2TP(2-NO_2)P]的Zn、Ni、Cu、Co、Mn、Fe的配合物与一系列含N有机碱的加合作用,测定了加合常数、加合分子数,总结了吸电子基团对金属卟啉的轴向效应以及中心金属离子和卟啉环氧化还原性的影响。     

Intermolecular forces for D2, N2, O2, F2 and CO2

The intermolecular potentials for D₂, N₂, O₂, F₂ and CO₂ are determined on the basis of the second virial coeffincients, the polarizabilities parallel and perpendicular to the molecular axes, and the electric quadrupole moment. The repulsive parts of the potentials are taken from the corresponding Kihara core-potentials. Effects of the octopolar induction are taken into consideration in a unique way. The potential depends on relative orientations of the two molecules as well as the distance r between the molecular centers. This dependence is shown in graphs. A measure of the anisotropy of the potential depth is 0.72 for CO₂ 0.36 for D₂, and smaller than 0.27 for N₂ O₂ and F₂. The remarkable anisotropy for CO₂ and D₂ is due to strong electrostatic quadrupole interactions.     

配合物[Cu(H2O)(C12H8N2)2].2ClO4的合成、性质及晶体结构

合成了配合物[Cu(H2O)(C12H8N2)2]*2ClO4(C12H8N2为1,10-邻菲咯啉),用元素分析、摩尔电导、红外光谱及电子光谱进行了表征,并测定了配合物的晶体结构.该晶体属单斜晶系,空间群为CC;晶胞参数a=1.9177(2)nm,b=0.81994(0)nm,c=1.62458(14)nm,β=100.104(6)°;V=2.5419(4)nm3,Z=4,F(000)=1300,DC=1.693g/cm3,R=0.0430,wR=0.1195.中心铜(Ⅱ)离子与两个1,10-邻菲咯啉的四个N原子和一个水分子的氧原子配位,形成了一个变形的三角双锥结构.     

Ba3 (VO4)2-K2 Ba(MoO4)2 and Pb3 (VO4)2-K2 Pb(MoO4)2 systems

Phase equilibria in the Ba₃(VO₄)₂-K₂Ba(MoO₄)₂ and Pb3(VO₄)₂-K₂Pb(MoO₄)₂ systems have been investigated. In the first system, a continuous series of substitutional solid solutions with the palmierite structure is formed, and in the second one, the polymorphic transition in lead orthovanadate at 100°C restricts the extent of the palmierite-type solid solution to 10–100 mol % K₂Pb(MoO₄)₂. Original Russian Text ? V.D. Zhuravlev, Yu.A. Velikodnyi, A.S. Vinogradova-Zhabrova, A.P. Tyutyunnik, V.G. Zubkov, 2008, published in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 10, pp. 1746–1748.     

The preparation of NbH5(Me2PCH2CH2Me2)2 and NbHL2(Me2PCH2CH2PMe2)2 (L = CO or C2H4)

MMe₅(dmpe) (M = Nb or Ta, dmpe = Me₂PCH₂CH₂PMe₂) reacts with H₂ (500 atm) and dmpe in THF at 60°C to give MH₅(dmpe)_2? NbH₅(dmpe)₂ readily reacts with two mol of CO or ethylene (L) to give NbHL₂(dmpe)₂. The exchange of the hydride ligand with the ethylene protons in NbH(C₂H₄)₂(dmpe)₂ is not rapid on the ¹H NMR time scale (60 MHz) at 95°C.     

Phase transitions in Ca3(BN2)2 and Sr3(BN2)2

α-Ca₃(BN₂)₂ crystallizes in the cubic system (space group: ) with one type of calcium ions disordered over of equivalent (8c) positions. An ordered low-temperature phase (β-Ca₃(BN₂)₂) was prepared and found to crystallize in the orthorhombic system (space group: Cmca) with lattice parameters: , , and . Structure refinements on the basis of X-ray powder data have revealed that orthorhombic β-Ca₃(BN₂)₂ corresponds to an ordered super-structure of cubic α-Ca₃(BN₂)₂. The space group Cmca assigned for β-Ca₃(BN₂)₂ is derived from by a group-subgroup relationship.DSC measurements and temperature-dependent in situ X-ray powder diffraction studies showed reversible phase transitions between β- and α-Ca₃(BN₂)₂ with transition temperatures between 215 and 240 °C.The structure Sr₃(BN₂)₂ was reported isotypic with α-Ca₃(BN₂)₂ () with one type of strontium ions being disordered over of equivalent (2c) positions. In addition, a primitive () structure has been reported for Sr₃(BN₂)₂. Phase stability studies on Sr₃(BN₂)₂ revealed a phase transition between a primitive and a body-centred lattice around 820 °C. The experiments showed that both previously published structures are correct and can be assigned as α-Sr₃(BN₂)₂ (, high-temperature phase), and β-Sr₃(BN₂)₂ (, low-temperature phase).A comparison of Ca₃(BN₂)₂ and Sr₃(BN₂)₂ phases reveals that the different types of cation disordering present in both of the cubic α-phases () have a directing influence on the formation of two distinct (orthorhombic and cubic) low-temperature phases.     

Zur Trennung von H2, O2, N2, NO, CO, N2O, CO2, C2H6, C2H4, C2H2, NO2(N2O4) und Feuchtigkeit

Ohne Zusammenfassung     

Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas

An experimental study on the conversion of NO in the NO/N₂, NO/O₂/N₂, NO/C₂H₄/N₂ and NO/C₂H₄/O₂/N₂ systems has been carried out using dielectric barrier discharge (DBD) plasmas at atmospheric pressure. In the NO/N₂ system, NO decomposition to N₂ and O₂ is the dominating reaction; NO conversion to NO₂ is less significant. O₂ produced from NO decomposition was detected by an on-line mass spectrometer. With the increase of NO initial concentration, the concentration of O₂ produced decreases at 298 K, but slightly increases at 523 K. In the NO/O₂/N₂ system, NO is mainly oxidized to NO₂, but NO conversion becomes very low at 523 K and over 1.6% of O₂. In the NO/C₂H₄/N₂ system, NO is reduced to N₂ with about the same NO conversion as that in the NO/N₂ system but without NO₂ formation. In the NO/C₂H₄/O₂/N₂ system, the oxidation of NO to NO₂ is dramatically promoted. At 523 K, with the increase of the energy density, NO conversion increases rapidly first, and then almost stabilizes at 93–91% of NO conversion with 61–55% of NO₂ selectivity in the energy density range of 317–550 J L⁻¹. It finally decreases gradually at high energy density. A negligible amount of N₂O is formed in the above four systems. Of the four systems studied, NO conversion and NO₂ selectivity of the NO/C₂H₄/O₂/N₂ system are the highest, and NO/O₂/C₂H₄/N₂ system has the lowest electrical energy consumption per NO molecule converted.     

Formation of [Cp2TiSbMe2]2, [Cp2TiSb(SiMe3)2]2 and [Cp2TiCl]2·2Mes4Sb2

Reactions of [Cp₂Ti(btmsa)] (btmsa = bis(trimethylsilyl)acetylene) with R₄Sb₂ (R = Me, Me₃Si) give [Cp₂TiSbMe₂]₂ (1) or [Cp₂TiSb(SiMe₃)₂]₂ (2) respectively. [Cp₂TiCl]₂·2Mes₄Sb₂ (3) is serendipitously formed from [Cp₂Ti(btmsa)] and Mes₂SbH containing NH₄Cl traces.     

Synthesis and structure of three manganese oxalates: MnC2O4·2H2O, [C4H8(NH2)2][Mn2(C2O4)3] and Mn2(C2O4)(OH)2

Three manganese oxalates have been hydrothermally synthesized, and their structures determined by single-crystal X-ray diffraction. MnC₂O₄·2H₂O (I) is orthorhombic, P2₁2₁2₁, , , , , Z=4, final R, R_w=0.0832, 0.1017 for 561 observed data (I>3σ(I)). The one-dimensional structure consists of chains of oxalate-bridged manganese centers. [C₄H₈(NH₂)₂][Mn₂(C₂O₄)₃] (II) is triclinic, , , , , α=81.489(2)°, β=81.045(2)°, γ=86.076(2)°, , Z=1, final R, R_w=0.0467, 0.0596 for 1773 observed data (I > 3σ (I)). The three-dimensional framework is constructed from seven coordinate manganese and oxalate anions. The material contains extra-framework diprotonated piperazine cations. Mn₂(C₂O₄)(OH)₂ (III) is monoclinic, P2₁/c, , , , β=91.10(3)°, , Z=1, final R₁, wR2=0.0710, 0.1378 for 268 observed data (I>2σ (I)). The structure is also three dimensional, with layers of MnO₆ octahedra pillared by oxalate anions. The hydroxide group is found bonded to three manganese centers resulting in a four coordinate oxygen.     

Synthesis and structural investigation of the compounds containing HF2 anions: Ca(HF2)2, Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6)

Three new compounds Ca(HF₂)₂, Ba₄F₄(HF₂)(PF₆)₃ and Pb₂F₂(HF₂)(PF₆) were obtained in the system metal(II) fluoride and anhydrous HF (aHF) acidified with excessive PF₅. The obtained polymeric solids are slightly soluble in aHF and they crystallize out of their aHF solutions. Ca(HF₂)₂ was prepared by simply dissolving CaF₂ in a neutral aHF. It represents the second known compound with homoleptic HF environment of the central atom besides Ba(H₃F₄)₂. The compounds Ba₄F₄(HF₂)(PF₆)₃ and Pb₂F₂(HF₂)(PF₆) represent two additional examples of the formation of a polymeric zigzag ladder or ribbon composed of metal cation and fluoride anion (MF⁺)_n besides PbF(AsF₆), the first isolated compound with such zigzag ladder. The obtained new compounds were characterized by X-ray single crystal diffraction method and partly by Raman spectroscopy. Ba₄F₄(HF₂)(PF₆)₃ crystallizes in a triclinic space group P1¯ with a=4.5870(2) Å, b=8.8327(3) Å, c=11.2489(3) Å, α=67.758(9)°, β=84.722(12), γ=78.283(12)°, V=413.00(3) Å³ at 200 K, Z=1 and R=0.0588. Pb₂F₂(HF₂)(PF₆) at 200 K: space group P1¯, a=4.5722(19) Å, b=4.763(2) Å, c=8.818(4) Å, α=86.967(10)°, β=76.774(10)°, γ=83.230(12)°, V=185.55(14) ų, Z=1 and R=0.0937. Pb₂F₂(HF₂)(PF₆) at 293 K: space group P1¯, a=4.586(2) Å, b=4.781(3) Å, c=8.831(5) Å, α=87.106(13)°, β=76.830(13)°, γ=83.531(11)°, V=187.27(18) Å³, Z=1 and R=0.072. Ca(HF₂)₂ crystallizes in an orthorhombic Fddd space group with a=5.5709(6) Å, b=10.1111(9) Å, c=10.5945(10) Å, V=596.77(10) Å³ at 200 K, Z=8 and R=0.028.