Synthesis, Structural Characterization, and Oxidation-Reduction Behavior of the gamma-Isomer of the Dodecatungstosilicate Anion

The reaction of tungstate ions with the gamma-10-tungstosilicate in mixed water-ethanol (v/v) yields the corresponding isomer of the 12-tungstosilicate isolated as its tetrabutylammonium salt. It was characterized by means of (183)W NMR, infrared, Raman, and UV spectroscopies and was identified with the isomer resulting from the Keggin structure (alpha-isomer) by rotation of two tritungstic groups by pi/3. Cyclic voltammetry shows that the reducibility increases in the sequence alpha-beta-gamma as the number of rotated tritungstic groups. Whereas the gamma-12-tungstosilicate anion is unstable in pure aqueous solution whatever the pH value, it is stable in mixed aqueous-organic or pure organic solvents, even at boiling temperatures. In contrast, the two- and four-electron-reduced blue species are stable in aqueous media but not the one-electron-reduced blue. Study of the (183)W NMR spectrum of the two-electron-reduced species showed that the two spin-paired electrons are delocalized on all the W atoms on the NMR time scale but have a larger residency time on one group of four atoms.     

硫化铟锌的改性合成及光催化特性

随着社会经济的高速发展,能源的短缺和生态的破坏引起了人们的关注。近年来,寻找合适的解决方案已成为关注的重点。作为一种绿色环保技术,光催化由于其高效、低成本等优点而成为能源和环境问题的研究热点。在许多光催化材料中,三元硫化物硫化铟锌(ZnIn₂S₄)由于具有可见光响应特性、简单的制备方法和出色的稳定性而表现出巨大的潜力。然而,较高的载流子复合率限制了其光催化性能。近年来,许多研究报道了改性ZnIn₂S₄以提高其光催化性能,在此,本文详细介绍了各种改性研究,包括ZnIn₂S₄单体的合成、半导体化合物的结构、贵金属沉积、碳元素改性、离子掺杂。然后,系统完整地总结了ZnIn₂S₄在光催化、降解有机污染物、去除六价铬、还原CO₂和有机合成等方面表现出的光催化特性和机理。最后,对ZnIn₂S₄的发展前景提出了展望,以期ZnIn₂S₄光催化剂得到更广泛和深入的研究,尽快在实际生产中得到应用。     

有机镓、铟芳酰腙配合物的制备与结构表征

通过芳酰腙与三甲基镓或三甲基铟的反应,制备得到了七个有机镓或铟的镓芳酰腙配合物,在配合物中金属直接与芳酰腙的氧和烯胺氮成键,形成五元环状分子内配合物。对得到的化合物通过元素分析、红外光谱、质子核磁共振和质谱进行了结构表征。     

花状硫化铟纳米多级结构的液相合成及形貌调控机理

以C2H5NS和In(NO3)3为前驱物,采用简单的液相法成功制备了In2S3纳米多级结构,C2H5NS作为硫源的同时也起到了模板剂的作用.研究结果表明,前驱物浓度对In2S3形貌控制起着重要作用.随着In(NO3)3/C2H5NS摩尔比从1∶1.5增加到1∶6,In2S3纳米花呈现了不同的形貌和尺寸.XRD谱图显示,In2S3纳米花晶体具有立方结构.SEM和TEM照片显示,制备的In2S3纳米结构呈多级花状结构,这种结构由纳米片堆积组装而成.通过第一性原理计算并结合实验结果对C2H5NS影响纳米片生长的机理进行了分析,结果表明C2H5NS在In2S3(001)晶面上的吸附可以有效降低晶面的表面能,起到稳定晶面的作用;纳米花的形成是在C2H5NS影响In2S3的晶面稳定性及其成核速率之间的一个协同效应.In2S3纳米晶的形貌可以通过调整反应溶液中的C2H5NS浓度来调节.     

Synthesis and Photophysical Properties of a Series of Dimeric Indium Quinolinates

A novel class of quinolinol-based dimeric indium complexes (1–6) was synthesized and characterized using ¹H and ¹³C(¹H) NMR spectroscopy and elemental analysis. Compounds 1–6 exhibited typical low-energy absorption bands assignable to quinolinol-centered π–π* charge transfer (CT) transition. The emission spectra of 1–6 exhibited slight bathochromic shifts with increasing solvent polarity (p-xylene < tetrahydrofuran (THF) < dichloromethane (DCM)). The emission bands also showed a gradual redshift, with an increase in the electron-donating effect of substituents at the C5 position of the quinoline groups. The absolute emission quantum yields (Φ_PL) of compounds 1 (11.2% in THF and 17.2% in film) and 4 (17.8% in THF and 36.2% in film) with methyl substituents at the C5 position of the quinoline moieties were higher than those of the indium complexes with other substituents.     

Synthesis and Crystal Structure of Potassium Indium Tribromide,KInBr3

KInBr₃, the first ternary indium bromide containing divalent indium, is synthesized from InBr₃, KBr, and elemental In at 450 °C. Its trigonal crystal structure (a = b = 853.24(1) pm, c = 1077.76(2) pm; P3¯; Z = 4) has been solved and refined from X-ray powder data. Indium atoms of oxidation state two are found in an [In₂Br₆]^2– unit with ecliptic ethane structure while potassium ions are located in two different polyhedra. There is an octahedral coordination by bromine anions for half of the K⁺ whereas the other K⁺ cations are located in trigonal Br^– prisms, tricapped by three additional Br^– anions.     

Synthesis and Characterization of Chiral Organogallium and Indium Complexes with Salen Ligands

Several new chiral organogallium and indium complexes with chiral Salen(1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis,IR,^1H NMR and Mass spectroscopy.For the gallium,Mono and bimetallic complexes were obtained,whereas ring closure complexes of indium were obtained.     

铟锡氧化物纳米粉体的低温溶剂热法制备

以氯化铟和氯化锡为原料,氨水为沉淀剂,先用化学沉淀法制备了前驱体,然后将该前驱体以乙二醇为溶剂在聚四氟乙烯内衬的反应釜中于低至190 ℃下反应,获得了铟锡氧化物(ITO)纳米粉体。采用扫描电子显微镜(SEM)、X射线衍射(XRD)及纳米粒度仪Zetasizer Nano-ZS对在不同温度、不同时间下反应的所得的ITO纳米粉体进行了表面形貌、结构和粒度分布等分析。结果表明,制备的ITO纳米粉体为立方晶相,粉体的平均颗粒小于100 nm;与已有的ITO纳米粉体制备方法相比,本溶剂热法制备过程无需高温烧结、流程简单,反应过程所需的温度可低至190 ℃,是迄今为止文献报导制备ITO的最低温度,同时所得产物纯度高、粒度均匀、分散性很好。     

水基溶胶凝胶法制备纳米氧化铟锡粉末

氧化铟锡（ITO）;PEG辅助的溶胶 凝胶法;纳米粉末     

Hydrothermal Synthesis and Structure Analysis of Indium Vanadate （InVO4）

1 INTRODUCTION Indium vanadate is a kind of vanadate compounds. There are two crystal phase structures, metastable monocline structure and stable orthogonal structure. Orel, B.[1] and his partners have discovered that V of tetrahedron VO4 has very sensitive energy gap band. Through XPS study of orthogonal InVO4, it is found that its band gap is shorter than those of InNbO4 and InTaO4, and its band-gap energy is 2.0 eV[4]. Ortho- gonal InVO4 can act during the range from short- wav…     

三价铟化合物在有机合成中的应用

综述了近年来三价铟化合物促进的多种有机反应及其在有机合成中的应用,其中重点讨论了三价铟化合物促进下的碳-碳键和碳-杂原子键的形成反应.     

Channel Structure Formed by Hydrogen Bonds and Filled by Water Molecules and Dodecatungstosilicate Anions

A new compound consisting of Keggin-type polyoxometalate and transition metal complex, [Cr(apca)₂(H₂O)₂]₄[SiW₁₂O₄₀]·12H₂O(1), (apca^??=?3-aminopyrazine-2-carboxylate anion), was synthesized with conventional method and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, TG analyses, PXRD. Fluorescent property was explored. The [SiW₁₂O₄₀]^4? anions and complex cations [Cr(apca)₂(H₂O)₂]⁺ in compound 1 are connected by hydrogen bonds and π–π interaction, forming the 3D structure. Especially, [Cr(apca)₂(H₂O)₂]⁺ cations are linked into left-hand helical chain extending along c-axis through hydrogen bonds, forming a channel A. The chains connect other four chains from four directions also through hydrogen bonds, then the four chains enclose a channel B whose inside dimension is a little bigger than that of A, polyoxoanions fill in the channel B, and free waters in the channel A. Compound 1 shows an asymmetric wide emission band at λ_max?=?435 nm, which may belongs to the intraligand π*?→?π transition.     

Indium Perovskite-Like Phases: Synthesis, Crystal Structure Refinement, and Properties

This paper describes syntheses and structure and composition refinement for phases of the general composition (In,Cu)Sr₂YCu₂O_{6 +} (1212) and (In,Cu)(Sr,Ho)₂(Ho,Ce)₂O_{8 +} (1222) obtained in air atmosphere and for the same phases treated in oxygen. Oxygen treatment did not change the oxygen content in the phases, but changed the composition of the cationic (especially In) sites. The absence of superconductivity is explained by the nonoptimal values of the formal charge of copper [FC(Cu)] obtained from the electroneutrality condition and taking into account the refined phase compositions. Superconductivity found for the phase of composition (In,Cu)Ba₂(Y,Ca)Cu₂O_{6 +} (T_c = 80 K) is lost when the sample is annealed in air and during subsequent thermobaric treatment, leading to changes in the oxygen and indium contents and to a decrease in FC(Cu) from 2.15 to 2.05 and 2.08, respectively.     

水相中铟促进下支链高烯丙基醇的合成

通过铟促进下醛与2-苯基-4-溴-2-丁烯在水相中经烯丙基化反应合成一系列的支链高烯丙基醇, 产率较高, 反应条件温和.     

铟（Ⅲ）的碱金属卤化物与冠醚配合物的合成及表征

在萃取研究过程中,合成了10种由四溴(或碘)合铟(Ⅲ)配阴离子与苯并-15-冠-5或二苯并-18-冠-6合钾(或钠)配阳离子相结合所形成的新型固体配合物。经元素分析、红外光谱及差热-热重等方法对配合物进行了表征。通过与相应的冠醚碱金属苦味酸盐配合物结构性质的对比,较合理地解释了这两类萃取体系之间存在的某些差别。