bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the synthesis and structure–effect relationship of multi‐aryl imidazoles with their fluorescence properties
Authors: Tian Mi , Wang Chao , Wang LiGong , Luo Kai , Zhao An , Guo CanCheng 
Published: October 2013

ABSTRACTIn this paper, 23 multi‐aryl imidazole derivatives were synthesized and identified by nuclear magnetic resonance, ultraviolet‐visible and elemental analysis. At the same time, their ultraviolet‐visible maximum absorption (λabmax), fluorescence emission maximum (λemmax) and quantum yields (Фf) were measured. The relationships between the optical behaviors and structures for these compounds were assessed. The results show that the λmaxab and λmaxem are red‐shifted and the fluorescence Фf are increased by the introduction of electron‐withdrawing substituents and the increase in the planarity of multi‐aryl imidazole molecules. The results also showed that the fluorescence quantum yields of the compounds containing two imidazole nuclei are double the corresponding mono‐imidazole nucleus compounds. Copyright © 2013 John Wiley & Sons, Ltd.
Revealing interaction between sulfobutylether‐β‐cyclodextrin and reserpine by chemiluminescence and site‐directed molecular docking
Authors: Xiong Xunyu , Wu Min , Zhao Xinfeng , Song Zhenghua 
Published: October 2013

ABSTRACTThe host–guest interaction between sulfobutylether‐β‐cyclodextrin (SBE‐β‐CD) and reserpine (RSP) is described using flow injection‐chemiluminescence (FI‐CL) and site‐directed molecular docking methods. It was found that RSP could inhibit the CL intensity produced by a luminol/SBE‐β‐CD system. The decrease in CL intensity was logarithmic over an RSP concentration range of 0.03 to 700.0 nM, giving a regression equation of ∆I = 107.1lgCRES + 186.1 with a detection limit of 10 pM (3σ). The CL assay was successfully applied in the determination of RSP in injection, saliva and urine samples with recoveries in the range 93.5–106.1%. Using the proposed CL model, the binding constant (KCD‐R) and the stoichiometric ratio of SBE‐β‐CD/RSP were calculated to be 7.4 × 106 M‐1 and 1 : 1, respectively. Using molecular docking, it was confirmed that luminol binds to the small cavity of SBE‐β‐CD with a nonpolar interaction, while RSP targeted the larger cavity of SBE‐β‐CD and formed a 1 : 1 complex with hydrogen bonds. The proposed new CL method has the potential to become a powerful tool for revealing the host–guest interaction between CDs and drugs, as well as monitoring drugs with high sensitivity. Copyright © 2013 John Wiley & Sons, Ltd.
Infants' object location and identity processing in spatial scenes: an ERP study
Authors: van Hoogmoed Anne H. , van den Brink Danielle , Janzen Gabriele 
Published: October 2013

AbstractBackgroundFast detection and identification of objects in an environment is important for using objects as landmarks during navigation. While adults rapidly process objects within an environment and use landmarks during navigation, infants do not routinely use distal landmarks below the age of 18 months. In the current event‐related potential (ERP) study we adopted an oddball paradigm to examine whether infants are capable of processing objects in environments, which is a prerequisite for using objects as landmarks.MethodsWe measured the electrophysiological correlates and time courses related to the processing of changes in object location, object identity, and a switch of two objects.ResultsTwelve‐month‐old infants showed an Nc (negative central) effect reflecting increased attention likely caused by initial change detection within 300 msec for all three manipulations. In addition, they showed conscious processing of an object change and a location change as evidenced by a positive slow wave (PSW).ConclusionThis study is the first to show that infants are capable of rapidly detecting changes in single objects when these are presented in an environment, but lack conscious detection of a switch. These results indicate that 12‐month‐old infants as yet lack the ability to rapidly bind the identity and location of multiple objects within an environment.
Person re‐identification with local descriptors across multicameras
Authors: Huang Qiao , Yang Jie 
Published: October 2013

ABSTRACTTracking the same person across multiple cameras is an important task in human motion analysis systems. It is also desirable to re‐identify the individuals who have been previously seen with a single camera. This paper addresses this problem by the re‐identification of the same individual in two different datasets, which are both challenging situations from human motion analysis systems. In this paper, local descriptors are introduced for image description, and support vector machines are employed for high classification performance and so an efficient bag‐of‐features approach for image presentation. In this way, robustness against low resolution, occlusion, and pose, viewpoint and illumination changes is achieved in a very fast way. We obtain promising results from the evaluation with situations where a number of individuals vary continuously from a multicamera system. Copyright © 2013 John Wiley & Sons, Ltd.
A faster triangle‐to‐triangle intersection test algorithm
Authors: Ling‐yu Wei 
Published: October 2013

ABSTRACTThe triangle‐to‐triangle intersection test is the most basic component of collision detection. And our algorithm, which firstly computes the line segment between triangle A and the plane of triangle B and uses a new method to detect the intersection between this line and triangle B, can reduce about 10% of time on average, compared with the previous fastest algorithm. Our new method divides the plane of triangle B into four quarter planes by two edges of B, and detects intersection depending on the location of the two endpoints of the segment. After using some techniques like avoiding division and projecting the segment and triangle B on XY, YZ, or ZX plane, the total number of arithmetic operations is reduced to at most 87, which is less than any existing algorithms. Copyright © 2013 John Wiley & Sons, Ltd.
Ionic Liquids as New Solvents for Textile Fiber Formation and Modification
Authors: Tavanaie M. A. 
Published: October 2013

AbstractIonic liquids (ILs) with their special characteristics such as low melting point, high thermal stability, electrical conductivity, and good solubility in different chemical liquids, are widely used as new solvents for a large range of inorganic, organic, and polymeric materials. The development of ILs created a great untapped potential for commercial and academic applications to increase operating efficiencies of many chemical processes, including the processing of textiles. A summarizing introduction about ILs, their characterization, the general applications, and the major challenges is presented, followed by previous researches on using ILs for textile fiber formation and modification of their properties.
Incorporation of Mass and Energy Integration in the Optimal Bioethanol Separation Process
Authors: Vázquez‐Ojeda M. , Segovia‐Hernández J. G. , Ponce‐Ortega J. M. 
Published: October 2013

AbstractA techno‐economic analysis for the separation process in bioethanol production is presented. Optimized azeotropic separation processes in conjunction with process integration (mass and energy) are considered to simultaneously enhance the results from economic and environmental points of view. Process integration improves significantly the separation process because it helps to reduce the overall energy required in the reboilers based on energy integration and additionally to diminish the amount of required solvent based on mass integration. The SYNHEAT optimization model was applied for energy integration whereas a direct recycle strategy was implemented for the mass integration process. The best separation processes obtained correspond to an integrated conventional separation sequence with energy integration to ethanol‐water mixture III and integrated optional separation sequences with energy integration to ethanol‐water mixture III, with significant savings in utility costs and possible recycling of nearly all solvent.
Design and Analysis of a Submerged Membrane Reactor by CFD Simulation
Authors: Meng L. , Cheng J.‐C. , Jiang H. , Yang C. , Xing W.‐H. , Jin W.‐Q. 
Published: October 2013

AbstractCFD was applied to demonstrate the effect of reactor configurations on the fluid flow pattern in submerged membrane reactors. A mixture model, a realizable k‐ϵ model, and the multiple reference frame (MRF) technique were employed to simulate the solid‐liquid turbulent flow. Influences of the introduction of a ceramic membrane, the relative position between ceramic membrane and impeller, and the types of impeller on velocity profiles and concentration distributions were systematically discussed. These simulation results were validated qualitatively with experimental data for various reactor configurations.
Recent Applications of Polymer Blends in Gas Separation Membranes
Authors: Mannan H. A. , Mukhtar H. , Murugesan T. , Nasir R. , Mohshim D. F. , Mushtaq A. 
Published: October 2013

AbstractPolymeric membranes are extensively used for gas separations but their performance is limited by the upper bound trade‐off discovered by Robeson in 1991. Among the attractive modifications available to increase the performance of polymeric membranes, polymer blending is a unique technique because it offers a time‐ and cost‐effective method of tuning the properties of membranes. A variety of polymer blends has been explored in recent years. The application of polymer blends in gas separation membranes is described by critically analyzing the performance of polymer blend membranes. Polymer blend membranes of different polymer pairs are reviewed and evaluated in terms of phase behavior, permeability, and selectivity.
Experiments and Simulations on Bidisperse Solids Suspension in a Mixing Tank
Authors: Ayranci I. , Kresta S. M. , Derksen J. J. 
Published: October 2013

AbstractExperiments and simulations of a solids suspension process in a lab‐scale stirred tank under turbulent conditions have been performed. Two impellers have been tested. The liquid‐solid suspension consists of water and a mixture of glass and bronze particles. The simulations are Eulerian‐Lagrangian with the liquid flow as the Eulerian part, being solved by means of a lattice‐Boltzmann method combined with a large‐eddy approach to turbulence modeling. Comparison with experimental visualizations indicates that the simulations are able to represent the start‐up of the suspension process from a zero‐velocity initial condition. Differences between experiment and simulation are observed near the bottom of the tank. The simulation data are used to highlight the collisional interaction between the two different types of solids, the role of baffles, and the effect of impeller type on the suspension process.
Effect of Additives on the Activity of CuO/Ce0.6Zr0.4O2 Catalysts for the Water‐Gas Shift Reaction
Authors: Jiang L. , Li C. , Li Z. , Zhang S. 
Published: October 2013

AbstractA series of CuO/Ce0.6Zr0.4O2 catalysts doped with rare earth (Y, La) oxides and transition metal (Fe, Co, Ni) promoters were synthesized by the coprecipitation method. The effects of the additive type and content on the structure, redox properties, and water‐gas shift (WGS) catalytic activity were investigated in detail by X‐ray diffraction, N2 physisorption, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, H2 temperature‐programmed reduction, and Raman spectroscopy. The catalytic activity was tested in terms of CO in H2‐rich coal‐derived synthesis gas, which simulated the actual gas composition of an integrated gasification combined cycle system. The experimental results revealed the beneficial role of doping with 3 wt % Fe in enhancing the catalytic performance by increasing the oxygen storage and mobility capacity, the reducibility, and the synergistic interaction between copper oxide and ceria‐zirconia.
Ring‐Closing Metathesis Reactions: Interpretation of Conversion–Time Data
Authors: Thiel Vasco , Wannowius Klaus‐Jürgen , Wolff Christiane , Thiele Christina M. , Plenio Herbert 
Published: October 2013

AbstractConversion–time data were recorded for various ring‐closing metathesis (RCM) reactions that lead to five‐ or six‐membered cyclic olefins by using different precatalysts of the Hoveyda type. Slowly activated precatalysts were found to produce more RCM product than rapidly activated complexes, but this comes at the price of slower product formation. A kinetic model for the analysis of the conversion–time data was derived, which is based on the conversion of the precatalyst (Pcat) into the active species (Acat), with the rate constant kact, followed by two parallel reactions: 1) the catalytic reaction, which utilizes Acat to convert reactants into products, with the rate kcat, and 2) the conversion of Acat into the inactive species (Dcat), with the rate kdec. The calculations employ two experimental parameters: the concentration of the substrate (c(S)) at a given time and the rate of substrate conversion (−dc(S)/dt). This provides a direct measure of the concentration of Acat and enables the calculation of the pseudo‐first‐order rate constants kact, kcat, and kdec and of kS (for the RCM conversion of the respective substrate by Acat). Most of the RCM reactions studied with different precatalysts are characterized by fast kcat rates and by the kdec value being greater than the kact value, which leads to quasistationarity for Acat. The active species formed during the activation step was shown to be the same, regardless of the nature of different Pcats. The decomposition of Acat occurs along two parallel pathways, a unimolecular (or pseudo‐first‐order) reaction and a bimolecular reaction involving two ruthenium complexes. Electron‐deficient precatalysts display higher rates of catalyst deactivation than their electron‐rich relatives. Slowly initiating Pcats act as a reservoir, by generating small stationary concentrations of Acat. Based on this, it can be understood why the use of different precatalysts results in different substrate conversions in olefin metathesis reactions.
Triblock Polyphiles through Click Chemistry: Self‐Assembled Thermotropic Cubic Phases Formed by Micellar and Monolayer Vesicular Aggregates
Authors: Tan Xiaoping , Kong Leiyang , Dai Heng , Cheng Xiaohong , Liu Feng , Tschierske Carsten 
Published: October 2013

AbstractThree series of triblock polyphiles consisting of a rigid 4‐phenyl‐1,2,3‐triazole or 1,4‐diphenyl‐1,2,3‐triazole core with three lipophilic and flexible alkoxyl chains at one end and a polar glycerol group at the opposite end were synthesized by copper‐catalyzed azide–alkyne click reactions. Their mesophase behavior was studied by polarizing optical microscopy, differential scanning calorimetry, and XRD. Depending on alkyl chain length and core length, a transition from hexagonal columnar to ${{\it Pm}\bar 3n}$‐type cubic phases was observed. In the cubic phases, the molecules are organized as spherical objects. Remarkably, compounds with a longer core unit have a higher tendency to form these cubic phases, and their stability is strongly enhanced over those of the compounds with a shorter core, despite longer cores having a smaller cone angle and therefore being expected to disfavor the formation of spherical objects. There is a large difference in the number of molecules involved in the spherical aggregates formed by compounds with long and short cores. Whereas the aggregates in the cubic phases of the compounds with short rod units are small and could be regarded as micellar, the long‐core compounds form much larger aggregates which are regarded as a kind of monolayer vesicular aggregate.
A Convenient and Selective Palladium‐Catalyzed Aerobic Oxidation of Alcohols
Authors: Gowrisankar Saravanan , Neumann Helfried , Gördes Dirk , Thurow Kerstin , Jiao Haijun , Beller Matthias 
Published: October 2013

AbstractAn efficient procedure for the oxidation of primary and secondary alcohols to aldehydes and ketones, respectively, with molecular oxygen under ambient conditions has been achieved. By applying catalytic amounts of Pd(OAc)2 in the presence of tertiary phosphine oxides (OPR3) as ligands, a variety of substrates are selectively oxidized without formation of ester byproducts. Spectroscopic investigations and DFT calculations suggest stabilization of the active palladium(II) catalyst by phosphine oxide ligands.
Tris(tetraceno)triquinacenes: Synthesis and Photophysical Properties of Threefold Linearly Extended Tribenzotriquinacenes
Authors: Mughal Ehsan Ullah , Eberhard Jens , Kuck Dietmar 
Published: October 2013

AbstractThe linear extension of the rigid, C3v‐symmetrical carbon framework of tribenzotriquinacene (TBTQ) along its three wings is reported. The key step of the extension procedure consists of a Diels–Alder reaction of three ortho‐quinodimethane units generated in situ at the triquinacene core. The use of 1,4‐naphthoquinone provides a facile and particularly efficient access to tris(tetraceno)‐annellated triquinacenes. The steady‐state photophysical properties of these new oligotetracenes bearing three mutually orthogonal chomophores are determined and analyzed by DFT calculations.
ChemInform Abstract: Effect of Retrapping on the Persistent Luminescence in Strontium Silicate Orange—Yellow Phosphor.
Authors: Xu Xuhui , Yu Xue , Zhou Dacheng , Qiu Jianbei 
Published: October 2013

AbstractA series of Sr3‐x‐1.5ySiO5:xEu2+, yLn3+ (Ln: Nd, Er, Dy, x = 0.0025, y = 0.0025) is prepared by solid state reaction of a stoichiometric mixture of SrCO3, SiO2, Eu2O3, and Ln2O3 (alumina crucible, 1400 °C, 4 h, N2 atmosphere).
ChemInform Abstract: A Novel Yellow Luminescent Material Ba3Y(PO4)3:Eu2+.
Authors: Yang Zhiping , Liu Pengfei , Li Jiaojiao , Yang Qiao , Lv Liang , Zhao Yinhong 
Published: October 2013

AbstractA series of new phosphors Ba3(1‐x)Y(PO4)3:xEu2+ (0.0025 ≤ x ≤ 0.12) is prepared by solid state reaction of stoichiometric mixtures of BaCO3, Y2O3, NH4H2PO4, and Eu2O3 (1200 °C, 3 h).
ChemInform Abstract: A High‐Pressure Route to Thermoelectrics with Low Thermal Conductivity: The Solid Solution Series AgInxSb1‐xTe2 (x = 0.1—0.6).
Authors: Schroeder Thorsten , Rosenthal Tobias , Souchay Daniel , Petermayer Christian , Grott Sebastian , Scheidt Ernst‐Wilhelm , Gold Christian , Scherer Wolfgang , Oeckler Oliver 
Published: October 2013

AbstractTitle compounds with x = 0.1, 0.2, 0.4, 0.5 and 0.6 are prepared by solid state reaction of stoichiometric mixtures of the elements (sealed silica ampoules, 950 °C, Ar) followed by hot isostatic pressing (multianvil press, 2.5 GPa, 400 °C, 5 h).
ChemInform Abstract: Polar and Magnetic Mn2FeMO6 (M: Nb, Ta) with LiNbO3‐Type Structure: High‐Pressure Synthesis.
Authors: Greenblatt Martha , et al. et al. 
Published: October 2013

AbstractThe title compounds are prepared from stoichiometric mixtures of MnO, Fe2O3, and Nb2O5 or Ta2O5 (Walker‐type multianvil press, 7 GPa, 1573 K).
ChemInform Abstract: A Facile Microwave‐Assisted Route to Co(OH)2 and Co3O4 Nanosheet for Li‐Ion Battery.
Authors: Chen Gen , Fu Engang , Zhou Meng , Xu Yun , Fei Ling , Deng Shuguang , Chaitanya Vimal , Wang Yongqiang , Luo Hongmei 
Published: October 2013

AbstractHexagonal Co(OH)2 nanosheets with average width of 2 μm and thickness of 100 nm are prepared from aqueous solutions of Co(NO3)2 and NH4OH by microwave irradiation (autoclave, 3 min).
ChemInform Abstract: Fate of a Giant {Mo72Fe30}‐Type Polyoxometalate Cluster in an Aqueous Solution at Higher Temperature: Understanding Related Keplerate Chemistry, from Molecule to Material.
Authors: Mekala Raju , Supriya Sabbani , Das Samar K. 
Published: October 2013

AbstractReflux of an aqueous solution of [Mo72Fe30O252 (OAc)12{Mo2O7(H2O)}2 {H2Mo2O8(H2O)}(H2O)] ·150H2O for 36 h results in the formation of nanoparticles of Fe2(MoO4)3 in the form of a yellow precipitate.
ChemInform Abstract: Single Crystal Growth, Transport, and Electronic Band Structure of YCoGa5.
Authors: Zhu Xiangde , Lu Wenjian , Ning Wei , Qu Zhe , Li Li , Qi T. F. , Cao Gang , Petrovic Cedomir , Zhang Yuheng 
Published: October 2013

AbstractSingle crystals of YCoGa5 are prepared from mixtures of the elements using a large excess of Ga as a flux (1100 °C, 6 h).
ChemInform Abstract: Ammonium—Cobalt—Nickel Phosphates, NH4 [Co1‐xNixPO4]·H2O.
Authors: Torre‐Fernandez Laura , Trobajo Camino , de Pedro Imanol , Alfonso Belen F. , Fabelo Oscar , Blanco Jesus A. , Garcia Jose R. , Garcia‐Granda Santiago 
Published: October 2013

AbstractTitle compounds with x = 0.00, 0.34, 0.59, 0.70, and 1.00 are prepared by hydrothermal reaction of MCl2 (M: Ni, Co) and solid (NH2)2CO in aqueous H3PO4 (autoclave, 180 °C, 7 d).
ChemInform Abstract: Iridium‐Catalyzed Enantioselective Hydrogenation of Unsaturated Heterocyclic Acids.
Authors: Song Song , Zhu Shou‐Fei , Pu Liu‐Yang , Zhou Qi‐Lin 
Published: October 2013

AbstractThe synthetic value of this protocol is demonstrated by an efficient preparation of nipecotic acid (VI).
ChemInform Abstract: Diastereoselective [2 + 2] Photocycloaddition of Cyclohexenone Derivative with Olefins in Supercritical Carbon Dioxide.
Authors: Nishiyama Yasuhiro , Nakatani Kazuya , Tanimoto Hiroki , Morimoto Tsumoru , Kakiuchi Kiyomi 
Published: October 2013

AbstractAn enhancement of conversion is observed for the title reaction around the critical density of CO2 due to a clustering effect.
ChemInform Abstract: Direct Sustainable Bromination of Alkenes in Aqueous Media and Basic Ionic Liquids.
Authors: Primerano Patrizia , Cordaro Massimiliano , Scala Angela 
Published: October 2013

AbstractVarious alkenes such as (I), (III) and (V) are chemo‐ and diastereoselectively dibrominated in a mixture of water and basic ionic liquids, which catalyze the direct addition of bromine.
ChemInform Abstract: Odorless Isocyanide Chemistry: An Integrated Microfluidic System for a Multistep Reaction Sequence.
Authors: Sharma Siddharth , Maurya Ram Awatar , Min Kyoung‐Ik , Jeong Guan‐Young , Kim Dong‐Pyo 
Published: October 2013

AbstractThis describes continuous‐flow microreactor setups for four reactions involving isocyanides: the synthesis of isocyanides from formamides, the Passerini reaction, the Ugi reaction, and the synthesis of quinazolinones from isocyanides.
ChemInform Abstract: Rh‐Catalyzed Direct Enantioselective Alkynylation of α‐Ketiminoesters.
Authors: Morisaki Kazuhiro , Sawa Masanao , Nomaguchi Jun‐ya , Morimoto Hiroyuki , Takeuchi Yosuke , Mashima Kazushi , Ohshima Takashi 
Published: October 2013

Abstractα‐Tetrasubstituted α‐amino acid derivatives are formed in high yield and enantioselectivity by using a Rh‐catalyzed enantioselective alkynylation of α‐ketiminoesters.
ChemInform Abstract: Highly Enantioselective Simmons—Smith Fluorocyclopropanation of Allylic Alcohols via the Halogen Scrambling Strategy of Zinc Carbenoids.
Authors: Beaulieu Louis‐Philippe B. , Schneider Jakob F. , Charette Andre B. 
Published: October 2013

AbstractExcellent diastereoselectivities are achieved, except for the Z‐cinnamyl alcohol (IV) which gives the trans‐diastereomer (V) only with 4:1 d.r.
ChemInform Abstract: Control of Selectivity in Palladium‐Catalyzed Oxidative Carbocyclization/Borylation of Allenynes.
Authors: Deng Youqian , Bartholomeyzik Teresa , Baeckvall Jan‐E. 
Published: October 2013

AbstractDepending on the reaction conditions a selectivity <80% for either the borylated trienes or the borylated vinylallenes is achieved in the product mixtures.
ChemInform Abstract: Enaminone Ligand‐Assisted Homo‐ and Cross‐Coupling of Terminal Alkynes under Mild Conditions.
Authors: Liu Yunyun , Wang Chunping , Wang Xiaobo , Wan Jie‐Ping 
Published: October 2013

AbstractThe title reaction exhibits good functional group compatibility and provides a convenient approach for the synthesis of symmetrical and unsymmetrical diynes.
ChemInform Abstract: Synthesis of 1‐Bromo‐1,4‐dienes via Palladium‐Catalyzed Bromoallylation of Alkynes.
Authors: Wen Yanmei , Jiang Huanfeng 
Published: October 2013

AbstractA novel bromoallylation reaction of alkynes using allylic alcohols such as (II) and (IV) as alkylating agents is described.