Multifunctional Molecular Material Combining Photocurrent Generation and Second-Order Optical Nonlinearity in LB Monolayer Films

ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｌｅｃｕｌａｒｎｏｎｌｉｎｅａｒｏｐｔｉｃｓ (ＮＬＯ)ｈａｓａｔｔｒａｃｔｅｄｉｎ ｃｒｅａｓｉｎｇｉｎｔｅｒｅｓｔｏｖｅｒｔｈｅｐａｓｔｔｅｎｙｅａｒｓ ,ｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｓｉｎｖａｒｉｏｕｓｆｉｅｌｄｓｉｎｃｌｕｄｉｎｇｔｅｌｅｃｏｍ ｍｕｎｉｃａｔｉｏｎｓ ,ｏｐｔｉｃａｌｄａｔａｓｔｏｒａｇｅａｎｄｐｒｏｃｅｓｓｉｎｇａｎｄｏｐｔｉ ｃａｌｐｏｗｅｒｌｉｍｉｔａｔｉｏｎ .1,2 Ｉｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｔｈｅｐ…     

Blue-light emitting diodes and flat display based on poly(p-phenylenevinylene) copolymers

Ｐｏｌｙｍｅｒｉｃｌｉｇｈｔｅｍｉｔｔｉｎｇｄｉｏｄｅｓ(ＬＥＤｓ)ｈａｖｅｄｒａｗｎｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｆｏｒｔｈｅｉｒｐｏｓｓｉｂｌｅａｐｐｌｉｃａｔｉｏｎｓｉｎｌａｒｇｅａｒｅａｆｌａｔｐａｎｅｌｄｉｓｐｌａｙｓｉｎｃｅｔｈｅ1990ｓｗｈｅｎａｇｒｏｕｐａｔＣａｍｂｒｉｄｇｅＵｎｉｖｅｒｓｉｔｙ[1]ｒｅｐｏｒｔｅｄｔｈａｔｐｏｌｙ(ｐｐｈｅｎｙｌｅｎｅｖｉｎｙｌｅｎｅ)(ＰＰＶ)ｅｘｈｉｂｉｔｓｅｌｅｃｔｒｏｌｕｍｉｎｅｓｃｅｎｃｅ.Ｓｉｇｎｉｆｉｃａｎｔｉｍｐｒｏｖｅｍｅｎｔ…     

[Co(H_2O)(HPO_4)]·H_2O: The Layered Divalent Metal Monohydrogenphosphate Structure

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｎｃｅｔｈｅｐｉｏｎｅｅｒｗｏｒｋｓｏｆＣｌｅａｒｆｉｅｌｄａｎｄｃｏｗｏｒｋｅｒｓｉｎｔｈｅ 196 0ｓ ,1,2 ｌａｙｅｒｅｄｍｅｔａｌｐｈｏｓｐｈａｔｅｓｈａｖｅａｔｔｒａｃｔｅｄｍｕｃｈａｔｔｅｎｔｉｏｎｄｕｅｔｏｔｈｅｉｒａｐｐｌｉｃａｔｉｏｎｓｏｎｉｏｎｅｘ ｃｈａｎｇｅ ,ｉｎｔｅｒｃａｌａｔｉｏｎ ,ｈｅｔｅｒｏｇｅｎｅｏｕｓｃａｔａｌｙｓｉｓａｎｄｓｏｒｐ ｔｉｏｎ .3 7Ａｍｏｎｇｔｈｅｎｕｍｅｒｏｕｓｌａｍｅｌｌａｒｐｈａｓｅｓ ,ｔｈｅｐｒｏｔｏ ｔｙｐｉｃａｌ…     

Synthesis and magnetic resonance of new heteropolynuclear Ln(III)-Cu(II) complexes with noncyclic polyether Schiff base

Ｎｏｎｃｙｃｌｉｃｐｏｌｙｅｔｈｅｒｓｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｔｅｎｔｉｏｎｆｏｒｔｈｅｉｒｎｏｎｅｘｐｅｎｓｉｖｅ,ｌｅｓｓｔｏｘｉｃｉｔｙａｎｄｓｏｏｎ.Ｔｈｅｙｈａｖｅｓｏｍｅｐｒｏｍｉｓｉｎｇａｐｐｌｉｃａｔｉｏｎｓｉｎｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎａｎｄｅｎｒｉｃｈｍｅｎｔｏｆｍｅｔａｌｉｏｎｓａｓｗｅｌｌａｓｉｎｔｈｅｉｏｎｓｅｌｅｃｔｉｖｅｅｌｅｃｔｒｏｄｅ,ｅｔｃ.[1].ＮｏｎｃｙｃｌｉｃｐｏｌｙｅｔｈｅｒＳｃｈｉｆｆｂａｓｅｉｓｏｎｅｏｆｐｏｌｙｄｅｎ…     

Application of Nafion／Cobalt Hexacyanoferrate Chemically Modified Electrodes for the Determination of Electroinactive Cations by Ion Chromatography

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｉｏｎｃｈｒｏｍａｔｏｇｒａｐｈｙ (ＩＣ)ｈａｓｂｅｅｎｒｅｃｏｇｎｉｚｅｄａｓａｕｓｅｆｕｌｍｅｔｈｏｄｆｏｒｔｈｅｓｅｐａｒａｔｉｏｎｏｆｉｎｏｒｇａｎｉｃａｎｉｏｎｓａｎｄｃａｔｉｏｎｓｓｉｎｃｅｉｔｓｉｎｔｒｏｄｕｃｔｉｏｎｂｙＳｍａｌｌｅｔａｌ .ｉｎ 1975 .1ＡｓｉｇｎｉｆｉｃａｎｔｔｒｅｎｄｉｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆＩＣｍｅｔｈｏｄｉｓｓｅａｒｃｈｆｏｒｓｅｎｓｉｔｉｖｅａｎｄｕｎｉｖｅｒｓａｌｄｅｔｅｃｔｉｏｎｍｅｔｈｏｄｓ .Ｔｈｅｍａｉｎｄｅｔ…     

Theoretical Study of La , Ca modified and Pure PbTiO_3 Nanocrystals

ＩｎｔｒｏｄｕｃｔｉｏｎＢｏｔｈｔｈｅｓｔｕｄｉｅｓｏｎｔｈｅｌｏｗ－ｄｉｍｅｎｓｉｏｎｍａｔｅｒｉａｌｓｏｆｍｏｄｉｆｉｅｄＰｂＴｉＯ３ａｎｄｐｕｒｅＰｂＴｉＯ３ｗｅｒｅｃａｒｒｉｅｄｏｕｔｓｙｎｃｈｒｏｎｏｕｓｌｙ，ｔｈｅａｕｔｈｏｒｓｈｏｐｅｄｔｏｓｔｒｅｎｇｔｈｅｎｔｈｅｐｈｙｓｉｃｏｃｈｅｍｉｃａｌｐｒｏｐｅｒ－ｔｉｅｓｏｆｔｈｅｍａｔｅｒｉａｌｓｉｎｓｏｍｅｒｅｓｐｅｃｔｓｂｙｍｅａｎｓｏｆｃｈａｎｇｉｎｇｄｅｓｉｇｎｍｏｄｉｆｉｃａｔｉｏｎｓｃｈｅｍｅ．Ａｍｏｎｇｔｈｅｎｕｍｅｒｏ…     

Synthesis of New Spiropyrans With a Polyaromatic or Heteroaromatic Pendant and Their Photochromic Behaviors

ＩｎｔｒｏｄｕｃｔｉｏｎＤｉｓｃｏｖｅｒｙｏｆｔｈｅｐｈｏｔｏｃｈｒｏｍｉｃｒｅａｃｔｉｏｎｓｏｆｓｐｉｒｏｐｙ ｒａｎｓｂｙＦｉｓｃｈｅｒａｎｄＨｉｒｓｈｂｅｒｇ1ｉｎ 195 2ａｎｄＨｉｒｓｈｂｅｒｇ’ｓｉｄｅａｏｆｕｓｉｎｇｔｈｅｐｈｅｎｏｍｅｎｏｎｆｏｒａ“ｐｈｏｔｏｃｈｅｍｉｃａｌｅｒａｓａｂｌｅｍｅｍｏｒｙ”2 ｉｎｉｔｉａｔｅｄａｃｔｉｖｅｒｅｓｅａｒｃｈｏｎｐｈｏ ｔｏｃｈｒｏｍｉｓｍ .Ｎｕｍｅｒｏｕｓｏｔｈｅｒａｐｐｌｉｃａｔｉｏｎｓｂａｓｅｄｏｎｒｅ ｖｅｒｓｉｂｌｅｃｏｌｏｒａｎｄｏ…     

Instructions to Authors

ＣｈｉｎｅｓｅＪｏｕｒｎａｌｏｆＣｈｒｏｍａｔｏｇｒａｐｈｙ,ａｊｏｕｒｎａｌｕｎｄｅｒｔａｋｅｎｂｙＣｈｉｎｅｓｅＣｈｅｍｉｃａｌＳｏｃｉｅｔｙ,ｐｕｂｌｉｓｈｅｓａｒｔｉｃｌｅｓｉｎＣｈｉｎｅｓｅａｎｄｉｎＥｎｇｌｉｓｈｏｎａｌｌａｓｐｅｃｔｓｏｆｃｈｒｏｍａｔｏｇｒａｐｈｙ .Ｔｏｐｉｃｓｉｎｃｌｕｄｅｎｅｗｏｒｉｍｐｒｏｖｅｄａｎａｌｙｔｉｃａｌａｎｄｐｒｅｐａｒａｔｉｖｅｍｅｔｈｏｄｓ,ｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｏｒｉｅｓ,ａｎｄｉｎｎｏｖａｔｉｖｅａｐｐｌｉｃａｔｉｏｎｓｏｆｃｈｒｏ…     

Two-dimensional Network Crown Ether Complex. Synthesis and Crystal Structure of 18-Crown-6 Complex: [K(18-C-6)]_2[Cd-(mnt)_2]

ＩｎｔｒｏｄｕｃｔｉｏｎＲｅｃｅｎｔｙｅａｒｓ ,ｃｏｏｒｄｉｎａｔｉｏｎｐｏｌｙｍｅｒｓｈａｖｅｂｅｅｎｒｅ ｃｅｉｖｅｄｍｕｃｈａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｔｈｅｉｒｉｎｔｅｒｅｓｔｉｎｇｐｈｙｓｉ ｃａｌｐｒｏｐｅｒｔｉｅｓｓｕｃｈａｓｅｌｅｃｔｒｉｃａｌｃｏｎｄｕｃｔｉｖｉｔｙ ,ｍａｇ ｎｅｔｉｓｍ ,ｎｏｎｌｉｎｅａｒｏｐｔｉｃａｌｐｒｏｐｅｒｔｉｅｓａｎｄｐｏｔｅｎｔｉａｌａｐｐｌｉ ｃａｔｉｏｎｓｉｎｓｅｐａｒａｔｉｏｎａｎｄｃａｔａｌｙｓｔ.1Ｔｈｅｍｏｄｕｌａｒａｐ ｐｒｏａｃｈ…     

Synthesis and Characterization of the Chiral Skeleton Cluster [η~5-C_5H_4C(O)CH_2CH_2C(O)OCH_3]RuCoW(μ_3-Se)(CO)_8

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｒａｎｓｉｔｉｏｎｍｅｔａｌｃｌｕｓｔｅｒｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｒｅｃｅｉｖｉｎｇｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔ ｙｅａｒｓｌａｒｇｅｌｙｂｅｃａｕｓｅｏｆｔｈｅｉｒ ｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｓｉｎｃａｔａｌｙｓｉｓａｓｗｅｌｌａｓｔｈｅｎｏｖｅｌｔｙａｎｄｖｅｒｓａｔｉｌｉｔｙｏｆｔｈｅｉｒｒｅａｃｔｉｏｎｓａｎｄｓｔｒｕｃｔｕｒｅｓ.[1～ 4] Ｏｕｒｉｎｔｅｒｅｓｔｉｎｍｅｔａｌｃｌｕｓｔｅｒｃａｔａｌｙｓｉｓｐ…     

Catalytic performance of silica-supported chromium oxide catalysts in ethane dehydrogenation with carbon dioxide

The oxidative dehydrogenation of ethane into ethylene by CO₂ over a series of silica-supported chromium oxide catalysts was investigated. The results showed that the catalysts were effective for the reaction and CO₂ in the feed promoted the catalytic activity. The 5%Cr/SiO₂ catalyst exhibited the excellent performance with 30.7% ethane conversion and 96.5% ethylene selectivity at 700^oC. ESR and UV-DRS were used to probe the active sites and the species with high valent states (Cr⁵⁺ and/or Cr⁶⁺) were found to be important for the reaction.     

Dehydrogenation of Isobutane to Isobutene with Carbon Dioxide over SBA‐15‐Supported Chromia‐Ceria Catalysts

A series of SBA‐15‐supported chromia‐ceria catalysts with 3% Cr and 1%–5% Ce (3Cr‐Ce/SBA) were prepared using an incipient wetness impregnation method. The catalysts were characterized by XRD, N₂ adsorption, SEM, TEM‐EDX, Raman spectroscopy, UV–vis spectroscopy, XPS and H₂‐TPR, and their catalytic performance for isobutane dehydrogenation with CO₂ was tested. The addition of ceria to SBA‐15‐supported chromia improves the dispersion of chromium species. 3Cr‐Ce/SBA catalysts are more active than SBA‐15‐supported chromia (3Cr/SBA), which is due to a higher concentration of Cr⁶⁺ species present on the former catalysts. The 3Cr‐3Ce/SBA catalyst shows the highest activity, which gives 35.4% isobutane conversion and 89.6% isobutene selectivity at 570 °C after 10 min of the reaction.     

Effect of chromium content on the properties of a microspherical alumina-chromium catalyst for isobutane dehydrogenation prepared with the use of a centrifugal thermal activation product of gibbsite

The states of chromium in both promoted and unpromoted alumina-chromium catalysts with various chromium contents prepared with the use of a centrifugal thermal activation product of gibbsite were studied in detail. The presence of five chromium species was found in the catalysts of this type: two Cr⁶⁺ and three Cr³⁺ species. The concentration of each particular chromium species depends on the total chromium content of the catalyst. Based on the experimental data, we hypothesized that highly disperse Cr³⁺ particles, the formation of which was completed at a chromium content of ∼7–9 wt %, are responsible for the catalytic activity of alumina-chromium samples in the reaction of isobutane dehydrogenation.     

CrOx/SiO2催化剂上丙烷在CO2气氛中脱氢反应的研究

采用XRD、UV-vis DRS、ESR和微分吸附量热等技术,考察了铬担载量分别为2.5、5和10wt%的CrO_x/SiO₂催化剂的结构、表面性质和氧化还原性能。结果表明,催化剂表面上存在多种Cr的氧化态和聚集形式。随着Cr担载量从2.5wt%到10wt%的逐渐增大,催化剂表面占主导地位的Cr物种由CrO₃单体转为多聚CrO₃和Cr₂O₃晶相。在CO₂气氛中催化剂对丙烷转化率和丙烯选择性的大小顺序为2.5wt%CrO_x/SiO₂>5wt%CrO_x/SiO₂>10wt%CrO_x/SiO₂,反应过程中的原位ESR和UV-visDRS测定结果表明,催化剂表面的反应活性中心为Cr⁵⁺,Cr⁵⁺可由催化剂预处理过程中Cr³⁺的氧化及丙烷反应过程中CrO₃单体的还原产生,在反应中CO₂可使Cr³⁺重新氧化为Cr⁵⁺.     

Catalytic dehydrogenation of ethanol into acetaldehyde and isobutanol using mono- and multicomponent copper catalysts

The purpose of this work was to investigate biomass-derived ethanol dehydrogenation into acetaldehyde using several mono- and multicomponent (CuO, ZnO and Cr₂O₃)-containing catalysts supported on industrial size Al₂O₃ beads. The catalysts, prepared with either solution combustion or incipient wetness method, were characterized by using various physico-chemical methods, such as EDXA, SEM-EDXA, TEM, XRD, XPS, pyridine adsorption desorption FTIR, and ζ-potential measurements. The results revealed that the multicomponent catalysts exhibited superior activity compared to the metal oxide catalysts containing only one metal oxide. In addition, the most selective catalyst towards acetaldehyde formation, with 50% selectivity at 55% conversion of ethanol at 300 °C and WHSV 1 h^?1 was CuOCr₂O₃/Al₂O₃ prepared by using the solution combustion method, indicating that this inexpensive and rapid catalyst preparation method is promising for other applications.     

Oxidative dehydrogenation of ethylbenzene to styrene with CO2 over Al-MCM-41-supported vanadia catalysts

Catalytic performance of Al-MCM-41-supported vanadia catalysts (V/Al-MCM-41) with different V loading was investigated for oxidative dehydrogenation of ethylbenzene to styrene (ST) with CO₂ (CO₂-ODEB). For comparison, pure silica MCM-41 was also used as support for vanadia catalyst. The catalysts were characterized by N₂ adsorption, X-ray diffraction (XRD) pyridine-Fourier-transform infrared spectroscopy, H₂-temperature-programmed reduction, thermogravimetric analysis (TGA), UV-Raman, and diffuse reflectance (DR) UV–vis spectroscopy. The results indicate that the catalytic behavior and the nature of V species depend strongly on the V loading and the support properties. Compared with the MCM-41-supported catalyst, the Al-MCM-41-supported vanadia catalyst exhibits much higher catalytic activity and stability along with a high ST selectivity (>98%). The superior catalytic performance of the present V/Al-MCM-41 catalyst can be attributed to the Al-MCM-41 support being more favorable for the high dispersion of V species and the stabilization of active V⁵⁺ species. Together with the characterization results of XRD, TGA, and DR UV–Vis spectroscopy, the deep reduction of V⁵⁺ into V³⁺ during CO₂-ODEB is the main reason for the deactivation of the supported vanadia catalyst, while the coke deposition has a less important impact on the catalyst stability.     

Mechanism of Butane Transformation

Catalytic activity and aromatic selectivity of n‐butane transformation were studied over various MFI type zeolites. From the data obtained, a reaction mechanism is suggested for different catalyst systems. It is visualized that in gallium doped catalysts, Ga³⁺ directly takes part both in cracking and dehydrogenation. The [Ga CH₃]²⁺ and [GaH]²⁺ species formed during cracking and dehydrogenation require protonic sites for regeneration of Ga³⁺ species. An alternative mechanism was suggested for dehydrogenation and cracking by Ga³⁺ without the involvement of protonic sites. However a protonic site would be required for aromatization. In case of gallosilicates a one step mechanism is suggested for cracking and dehydrogenation reaction which does not require the presence of protonic sites in the catalyst system.     

Synthesis and study of zeolites modified with cation metals as catalysts for the reaction of oxidative dehydrogenation of naphthenic hydrocarbons

A study of the catalytic activity of modified zeolites in the reaction of selective oxidative dehydrogenation of cyclohexane and methyl cyclohexane demonstrated that catalysts prepared on the basis of natural clinoptilolite modified with Cu²⁺, Zn²⁺, Co²⁺, and Cr³⁺ cations exhibit the highest activity in the reactions under consideration. Principles to be used when selecting high-efficiency catalytic systems for the reaction of oxidative dehydrogenation of alicyclic hydrocarbons to the corresponding dienes are formulated.     

Platinum‐Promoted Ga/Al2O3 as Highly Active,Selective, and Stable Catalyst for the Dehydrogenation of Propane

A novel catalyst material for the selective dehydrogenation of propane is presented. The catalyst consists of 1000 ppm Pt, 3 wt % Ga, and 0.25 wt % K supported on alumina. We observed a synergy between Ga and Pt, resulting in a highly active and stable catalyst. Additionally, we propose a bifunctional active phase, in which coordinately unsaturated Ga³⁺ species are the active species and where Pt functions as a promoter.     

介孔氧化铝负载Ni-Co氧化物催化剂上丙烷氧化脱氢制丙烯

以非离子型三嵌段共聚物作为模板剂, 异丙醇铝为氧化铝的前驱物, 采用一锅法合成了一系列介孔氧化铝负载镍氧化物、钴氧化物以及镍-钴双金属氧化物催化剂, 并以介孔氧化铝为载体, 采用浸渍法制备了负载Ni-Co 氧化物催化剂. 采用N₂吸附-脱附、高分辨透射电镜(HRTEM)、X射线粉末衍射(XRD)、H₂程序升温还原(H₂-TPR)以及激光拉曼光谱(LRS)等技术对催化剂的结构与性质进行表征, 并考察了催化剂的丙烷氧化脱氢反应性能. 结果表明: 一锅法制备的各催化剂均有大的比表面积和规整的孔道结构, 且负载的金属氧化物高度分散; 而浸渍法制备的催化剂, 其载体的介孔结构被破坏并有Co₃O₄晶相生成. 在考察的催化剂中, 一锅法合成的介孔氧化铝负载Ni-Co 氧化物催化剂表现出最佳的丙烷氧化脱氢性能. 在450 °C、C₃H₈:O₂:N₂的摩尔比为1:1:4和空速(GHSV)为10000 mL·g^-1·h^-1条件下, 该催化剂上丙烯产率为10.3%, 远高于浸渍法制备的催化剂上所获得的丙烯产率(2.4%). 关联催化剂表征和反应结果, 讨论了催化剂结构与性能之间的关系.