bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geometrically Restricted Intermediates in the Self‐Assembly of an M12L24Cuboctahedral Complex
Authors: Fujita Daishi , Yokoyama Hiroyuki , Ueda Yoshihiro , Sato Sota , Fujita Makoto 
Published: November 2014

AbstractThe self‐assembly of a cuboctahedral M12L24complex is traced by time‐dependent NMR spectroscopy and mass spectrometry. The metastable intermediate structures that exist during the self‐assembly process are not a chaotic mixture of numerous species, but instead are geometrically restricted. Short‐lived M8L16(D4d) and relatively long‐lived M9L18(D3h) are fully characterized as major intermediates. Employing a ligand with a smaller bend angle (112°) allows these two species to be kinetically trapped and more clearly observed by NMR spectroscopy. X‐ray crystallography shows that M9L18has the framework topology predicted by geometric discussion.
In situ Synchrotron IR Microspectroscopy of CO2 Adsorption on Single Crystals of the Functionalized MOF Sc2(BDC‐NH2)3
Authors: Greenaway Alex , Gonzalez‐Santiago Berenice , Donaldson Paul M. , Frogley Mark D. , Cinque Gianfelice , Sotelo Jorge , Moggach Stephen , Shiko Elenica , Brandani Stefano , Howe Russell F. , Wright Paul A. 
Published: November 2014

AbstractSynchrotron radiation (SR) IR microspectroscopy has enabled determination of the thermodynamics, kinetics, and molecular orientation of CO2 adsorbed in single microcrystals of a functionalized metal–organic framework (MOF) under conditions relevant to carbon capture from flue gases. Single crystals of the small‐pore MOF, Sc2(BDC‐NH2)3, (BDC‐NH2=2‐amino‐1,4‐benzenedicarboxylate), with well‐defined crystal form have been investigated during CO2 uptake at partial pressures of 0.025‐0.2 bar at 298–373 K. The enthalpy and diffusivity of adsorption determined from individual single crystals are consistent with values obtained from measurements on bulk samples. The brilliant SR IR source permits rapid collection of polarized spectra. Strong variations in absorbance of the symmetric stretch of the NH2 groups of the MOF and the asymmetric stretch of the adsorbed CO2 at different orientations of the crystals relative to the polarized IR light show that CO2 molecules align along channels in the MOF.
Enantioselective Construction of Vicinal Tetrasubstituted Stereocenters by the Mannich Reaction of Silyl Ketene Imines with Isatin‐Derived Ketimines
Authors: Zhao Jiannan , Fang Bing , Luo Weiwei , Hao Xiaoyu , Liu Xiaohua , Lin Lili , Feng Xiaoming 
Published: November 2014

AbstractA highly enantioselective Mannich reaction of silyl ketene imines with isatin‐derived ketimines has been realized by using a chiral N,N′‐dioxide/ZnII catalyst. A variety of β‐amino nitriles containing congested vicinal tetrasubstituted stereocenters were obtained with excellent outcomes (up to 98 % yield, >19:1 d.r. and 99 % ee). Based on the experimental investigations, a possible transition state has been proposed to explain the origin of the asymmetric induction.
Graphitic Carbon Nitride Nanoribbons: Graphene‐Assisted Formation and Synergic Function for Highly Efficient Hydrogen Evolution
Authors: Zhao Yang , Zhao Fei , Wang Xiaopeng , Xu Chenyu , Zhang Zhipan , Shi Gaoquan , Qu Liangti 
Published: November 2014

AbstractThe development of new promising metal‐free catalysts is of great significance for the electrocatalytic hydrogen evolution reaction (HER). Herein, a rationally assembled three‐dimensional (3D) architecture of 1D graphitic carbon nitride (g‐C3N4) nanoribbons with 2D graphene sheets has been developed by a one‐step hydrothermal method. Because of the multipathway of charge and mass transport, the hierarchically structured g‐C3N4 nanoribbon–graphene hybrids lead to a high electrocatalytic ability for HER with a Tafel slope of 54 mV decade−1, a low onset overpotential of 80 mV and overpotential of 207 mV to approach a current of 10 mA cm−2, superior to those non‐metal materials and well‐developed metallic catalysts reported previously. This work presents a great advance for designing and developing highly efficient metal‐free catalyst for hydrogen evolution.
Thermogravimetric and Fourier‐transform infrared analyses on the cure behavior of polycardanol containing epoxy groups cured by electron beam
Authors: Cheon Jinsil , Cho Donghwan , Song Bong Keun , Park Jihyun , Kim Byungnam , Lee Byung Cheol 
Published: November 2014

ABSTRACTIn this study, the curing behavior of polycardanol containing epoxy groups (diepoxidized polycardanol) was exploited in terms of thermal stability and the cure reaction conversion by means of thermogravimetric analysis and Fourier‐transform infrared spectroscopy, respectively. The effect of photo‐initiator type and concentration and electron beam absorption dose in the presence of cationic photo‐initiators (triarylsulfonium hexafluorophosphate (P‐type) and triarylsulfonium hexafluoroantimanate (Sb‐type) on the cure behavior of diepoxidized cardanol (DEC) resin was investigated. The thermal stability of DEC with Sb‐type photo‐initiator was higher than that with P‐type one, being increased with increasing the concentration and electron beam absorption dose. The conversion of cure reaction was gradually increased with increasing the dose, showing the maximum at 800 kGy. The results revealed that Sb‐type photo‐initiator, the concentration of 2 or 3 wt %, and electron beam absorption dose of about 800 kGy may be preferable for initiating epoxy ring opening in the DEC molecules as well as for efficiently curing the DEC resin by electron beam irradiation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41599.
Reliable H∞ Control for a Class of Nonlinear Networked Control Systems with Random Delays
Authors: Wang Yanqian , Zhuang Guangming , Zhang Shuyu , Shan Zhenfang 
Published: November 2014

AbstractIn this paper, the problem of reliable H∞ controller design is studied for a class of nonlinear networked control systems. A novel model is presented, which contains random transmission delays, faults of the sensor and actuator. The sensor‐to‐controller and controller‐to‐actuator transmission delays with upper bounds are considered, simultaneously. The working conditions of the sensor and actuator are formulated as two independent Markov chains, which take matrix values in finite sets, respectively. The resulting closed‐loop system is converted into a Markov switching system. On the basis of the cone complementary linearization algorithm, a mode‐dependent reliable controller is constructed such that the closed‐loop system is stochastically stable and attains the prescribed H∞ disturbance attenuation level. Finally, a numerical example is given to show the effectiveness of the developed technique.
Quantized Filtering for Continuous‐Time Markovian Jump Systems with Deficient Mode Information
Authors: Wei Yanling , Qiu Jianbin , Karimi Hamid Reza 
Published: November 2014

AbstractThis paper investigates the problem of quantized
filtering for a class of continuous‐time Markovian jump linear systems with deficient mode information. The measurement output of the plant is quantized by a mode‐dependent logarithmic quantizer, and the deficient mode information in the Markov stochastic process simultaneously considers the exactly known, partially unknown, and uncertain transition rates. By fully exploiting the properties of transition rate matrices, together with the convexification of uncertain domains, a new sufficient condition for quantized
performance analysis is first derived, and then two approaches, namely, the convex linearization approach and iterative approach, to the
filter synthesis are developed. It is shown that both the full‐order and reduced‐order filters can be obtained by solving a set of linear matrix inequalities (LMIs) or bilinear matrix inequalities (BMIs). Finally, two illustrative examples are given to show the effectiveness and less conservatism of the proposed design methods.
A sensitive assay of mercury using fluorescence correlation spectroscopy of gold nanoparticles
Authors: Xu Zhancheng , Lan Tao , Huang Xiangyi , Dong Chaoqing , Ren Jicun 
Published: November 2014

AbstractWe described a new and sensitive method for the determination of mercury ions (Hg2+) on the basis of fluorescence correlation spectroscopy (FCS) and recognition of oligonucleotides. In this assay, 30‐nm gold nanoparticles (GNPs) were modified with oligonucleotides containing thymine bases (T) as fluorescent probes, and the principle of this assay was based on the specific binding of Hg2+ by two DNA thymine bases. When two GNPs labelled with different oligonucleotides were mixed with a sample containing Hg2+, the T‐Hg2+‐T binding reaction should cause GNPs to form dimers (or oligomers), which would lead to a significant increase in the characteristic diffusion time of GNPs in the detection volume. The FCS method is a single molecule detection method and can sensitively detect the change in the characteristic diffusion time of GNPs before and after binding reactions. The quantitative analysis was performed according to the relation between the change in the characteristic diffusion time of GNPs and the concentration of Hg2+. Under optimal conditions, the linear range of this method was from 0.3 nM to 100 nM, and the detection limit was 0.14 nM for Hg2+. This new method was successfully applied for direct determination of Hg2+ levels in water and cosmetics samples. Copyright © 2014 John Wiley & Sons, Ltd.
Pharmacokinetics and penetration into synovial fluid of systemical and electroporation administered sinomenine to rabbits
Authors: Yan Huan , Yan Miao , Li Huan‐De , Jiang Pei , Deng Yang , Cai Hua‐lin 
Published: November 2014

AbstractSinomenine is an anti‐rheumatoid arthritis (RA) drug derived from the Sinomenium acutum. The major site of RA treatment is within the synovial compartment. However, the pharmacokinetic and penetration into synovial fluid (SF) of sinomenine have not been reported. In our study, the pharmacokinetics and penetration into SF of systemic and electroporation administered sinomenine were investigated by microdialysis incorporated with HPLC‐MS/MS. Sinomenine went into plasma and SF more rapidly with higher peak concentration (Cmax) by intramuscular injection compared with oral administration. The area under the concentration–time graph (AUC0–∞) of intramuscularly injected sinomenine was 1,403,294.75 ± 125,534.567 ng min/mL in plasma and 456,116.37 ± 62,648.36 ng min/mL in SF, which were equivalent with those for an oral dose. These results indicated that equal amounts of sinomenine could penetrate into SF by the two administration routes, and the permeation ratios were approximately 1:3. The AUC0–∞ and Cmax were lower with electroporation compared with systemic administration, but the CSF/CPlasma (concentration of sinomenine in SF vs that of plasma) at 90, 120, 150, 180, 240 and 480 min by electroporation was 3‐ to 10‐fold higher relative to systemic administration. This illustrated that sinomenine can be targeted into joints by electroporation, and electroporation is a potential technique for sinomenine's transdermal delivery. Copyright © 2014 John Wiley & Sons, Ltd.
Endovascular therapy by CO2 angiography to prevent contrast‐induced nephropathy in patients with chronic kidney disease: A prospective multicenter trial of CO2 angiography registry
Authors: Fujihara Masahiko , Kawasaki Daizo , Shintani Yoshiaki , Fukunaga Masashi , Nakama Tatsuya , Koshida Ryouji , Higashimori Akihiro , Yokoi Yoshiaki ,   on behalf of the CO Angiography Registry Investigators
Published: November 2014

ObjectivesTo assess the safety and efficacy of carbon dioxide (CO2) angiography‐guided endovascular therapy (EVT) for renal, iliofemoral artery disease.BackgroundPatients with peripheral vascular disease (PVD) often have chronic kidney disease (CKD) and the use of iodinated contrast media may enhance the risk of contrast‐induced nephropathy (CIN). Contrast volume reduction is an effective CIN preventive strategy.MethodsA prospective multicenter registry was developed and six clinical centers participated in the study. Patients with an estimated glomerular filtration rate (eGFR) of <60 ml/min/1.73 m2 and stage‐3 CKD were recruited between February 2012 and March 2013. CO2 angiography‐guided EVT was performed; incomplete CO2 angiograms were supplemented by intravascular ultrasound, pressure wire, and/or minimal iodinated contrast media. The primary endpoint was a composite of freedom from renal events and freedom from major CO2 angiography related complications.ResultsThis study included 98 patients with 109 lesions. The mean eGFR baseline was 35.2 ± 12.7 ml min−1. CO2 angiography‐guided angioplasty were performed in 16 renal arteries, 31 aortoiliac arteries, and 62 superficial femoral arteries. The technical success rate was 97.9%. Average CO2 consumption was 281.4 ± 155.8 ml, average dose of iodinated contrast media was 15.0 ± 18.1 ml. Primary endpoint was 92.8% (91/98). Incidence of CIN was 5.1% (5/98) and CO2 angiography‐related complications occurred in 17.3% (17/98). Two cases (2%) developed severe, fatal, nonocclusive mesenteric ischemia (NOMI).ConclusionsThis trial showed that CO2 angiography‐guided angioplasty was effective for preventing CIN, however, CO2 angiography related complication was somewhat high. © 2014 Wiley Periodicals, Inc.
Coronary artery aneurysms associated with ascending aortic aneurysms and abdominal aortic aneurysms: Pathophysiologic implications
Authors: Balderston Jessica R. , Giri Jay , Kolansky Daniel M. , Bavaria Joseph E. , Gertz Zachary M. 
Published: November 2014

BackgroundCoronary artery aneurysms (CAA) are seen in 1–5% of angiograms. Aneurysmal coronary disease has been thought to be a variant of atherosclerotic coronary artery disease (CAD) in most patients, but this has not been systematically studied.MethodsTo better understand the pathophysiology of CAA, we reviewed the cardiac catheterization films of 403 patients with ascending thoracic aortic aneurysms and 74 patients with abdominal aortic aneurysms (AAA) who underwent surgery for their aortic aneurysms at our institution. Coronary aneurysms had diameters 1.5‐fold that of a reference segment.ResultsThe incidences of CAA in patients with ascending aneurysms and AAA were 17% and 16% respectively (P = 0.92). CAAs in the ascending group were larger (mean diameter 5.9 vs. 5.0 mm, P = 0.12) with larger reference vessel size (3.1 vs. 2.6 mm, P = 0.03). CAAs in the patients with ascending aneurysms were less likely to be CAD‐associated within the same vessel (12% vs. 75%, P < 0.001). This difference remained significant after controlling for the presence of generalized CAD. No other differences in CAAs between the two groups were found. Within the ascending aneurysm group, the only clinical variable independently associated with CAA was bicuspid aortic valve (OR 0.47, 95% confidence interval 0.25–0.89, P = 0.02). The majority of patients with CAA in the ascending aortic aneurysm population did not have CAD or any other previously identified cause of CAA.ConclusionsThere is a high incidence of CAA in patients with aortic aneurysms. In patients with ascending aortic aneurysms there is likely a mechanism distinct from CAD that causes CAAs. © 2014 Wiley Periodicals, Inc.
Williams syndrome presenting with findings consistent with Alagille syndrome
Authors: Sakhuja Pankaj , Whyte Hilary , Kamath Binita , Martin Nicole , Chitayat David 
Published: November 2014

Key Clinical MessageConjugated hyperbilirubinemia, posterior embryotoxon, and vertebral anomalies are not features of William syndrome (WS). We herein report a preterm infant who presented with features suggestive of Alagille syndrome, but microarray showed findings consistent with WS. This further extends the phenotype of WS and emphasizes the need for microarray analysis.
Flavin‐Functionalized Gold Nanoparticles as an Efficient Catalyst for Aerobic Organic Transformations
Authors: Imada Yasushi , Osaki Motonari , Noguchi Mikiko , Maeda Takatoshi , Fujiki Misa , Kawamorita Soichiro , Komiya Naruyoshi , Naota Takeshi 
Published: November 2014

AbstractMonolayer‐protected gold clusters functionalized with synthetic flavins were synthesized and their catalytic activity in aerobic organic transformations investigated. Gold nanoparticles with 5‐ethyl‐3‐(8‐thiooctyl)lumiflavinium perchlorate acts as an efficient catalyst for the aerobic oxidation of organic sulfides to the corresponding sulfoxides upon treatment with hydrazine at room temperature and under atmospheric pressure in oxygen. With a catalytic amount of gold nanoparticles with 3‐(8‐thiooctyl)lumiflavin, diimide reduction of various olefins can be performed with hydrazine at room temperature under atmospheric pressure in air with greater yields of product alkanes than with non‐supported 3‐methyllumiflavin catalyst under the same conditions. Kinetic studies revealed that the monolayer‐protected gold cluster‐catalyzed reactions proceeded faster than those with non‐supported catalysts over the full substrate concentration range for the hydrogenation of olefins and at lower substrate concentrations for sulfoxidation. This positive effect was rationalized by assuming a Michaelis–Menten‐type mechanism in which the specific inclusion of substrates into the enzyme‐like reaction cavities was a key factor in the high efficiency of the supported flavin catalysts.
Numerical Simulation of Particle Segregation in Vibration Fluidized Beds
Authors: Sun Liyan , Zhao Feixiang , Zhang Qinghong , Li Dan , Lu Huilin 
Published: November 2014

AbstractThe influence of vibration parameters on the segregation phenomenon of a binary mixture in a vibration fluidized bed is investigated. Initially, the mixture composed of spherical balls with different densities but same diameter is in a perfect mixing state in the bed. The motion of particles is simulated based on the discrete element method. The effects of friction coefficient, vibration frequency, amplitudes, and gas velocity are analyzed. The coefficient of segregation to the degree of particle segregation is calculated for different operating conditions. The segregation degree in the vibration fluidized bed is found to be higher than that in the bed without vibration. The curve for the segregation degree exhibits a single peak value which represents the optimal segregation result.
Droplet Size Distribution Obtained by Atomization with Two‐Fluid Nozzles in a Spray Dryer
Authors: Sander Aleksandra , Penović Tomislav 
Published: November 2014

AbstractThe possibility of predicting the droplet size distribution from the particle size distribution was investigated. For that purpose, suspensions of different types of materials were dried in a laboratory‐scale spray drier. Drying of suspensions was performed with different sizes of two‐fluid nozzles. Droplet size distribution was evaluated from the data obtained for spray drying of bismuth molybdate suspension. The method was validated experimentally with other tested materials. Investigated systems involve processes of drying, crystallization, and coating. The proposed methodology can be applied when nonagglomerated particles, spherical particles, or spherical agglomerates were obtained by spray drying.
Origin of the Enantioselectivity in Organocatalytic Michael Additions of β‐Ketoamides to α,β‐Unsaturated Carbonyls: A Combined Experimental, Spectroscopic and Theoretical Study
Authors: Quintard Adrien , Cheshmedzhieva Diana , Sanchez Duque Maria del Mar , Gaudel‐Siri Anouk , Naubron Jean‐Valère , Génisson Yves , Plaquevent Jean‐Christophe , Bugaut Xavier , Rodriguez Jean , Constantieux Thierry 
Published: November 2014

AbstractThe organocatalytic enantioselective conjugate addition of secondary β‐ketoamides to α,β‐unsaturated carbonyl compounds is reported. Use of bifunctional Takemoto’s thiourea catalyst allows enantiocontrol of the reaction leading either to simple Michael adducts or spirocyclic aminals in up to 99 % ee. The origin of the enantioselectivity has been rationalised based on combined DFT calculations and kinetic analysis. This study provides a deeper understanding of the reaction mechanism, which involves a predominant role of the secondary amide proton, and clarifies the complex interactions occurring between substrates and the catalyst.
Univalent Gallium Complexes of Simple and ansa‐Arene Ligands: Effects on the Polymerization of Isobutylene
Authors: Lichtenthaler Martin R. , Maurer Steffen , Mangan Robert J. , Stahl Florian , Mönkemeyer Florian , Hamann Julian , Krossing Ingo 
Published: November 2014

AbstractUsing [Ga(C6H5F)2]+[Al(ORF)4]−(1) (RF=C(CF3)3) as starting material, we isolated bis‐ and tris‐η6‐coordinated gallium(I) arene complex salts of p‐xylene (1,4‐Me2C6H4), hexamethylbenzene (C6Me6), diphenylethane (PhC2H4Ph), and m‐terphenyl (1,3‐Ph2C6H4): [Ga(1,4‐Me2C6H4)2.5]+ (2+), [Ga(C6Me6)2]+ (3+), [Ga(PhC2H4Ph)]+ (4+) and [(C6H5F)Ga(μ‐1,3‐Ph2C6H4)2Ga(C6H5F)]2+ (52+). 4+ is the first structurally characterized ansa‐like bent sandwich chelate of univalent gallium and 52+ the first binuclear gallium(I) complex without a GaGa bond. Beyond confirming the structural findings by multinuclear NMR spectroscopic investigations and density functional calculations (RI‐BP86/SV(P) level), [Ga(PhC2H4Ph)]+[Al(ORF)4]−(4) and [(C6H5F)Ga(μ‐1,3‐Ph2C6H4)2Ga(C6H5F)]2+{[Al(ORF)4] −}2 (5), featuring ansa‐arene ligands, were tested as catalysts for the synthesis of highly reactive polyisobutylene (HR‐PIB). In comparison to the recently published 1 and the [Ga(1,3,5‐Me3C6H3)2]+[Al(ORF)4]− salt (6) (1,3,5‐Me3C6H3=mesitylene), 4 and 5 gave slightly reduced reactivities. This allowed for favorably increased polymerization temperatures of up to +15 °C, while yielding HR‐PIB with high contents of terminal olefinic double bonds (α‐contents=84–93 %), low molecular weights (Mn=1000–3000 g mol−1) and good monomer conversions (up to 83 % in two hours). While the chelate complexes delivered more favorable results than 1 and 6, the reaction kinetics resembled and thus concurred with the recently proposed coordinative polymerization mechanism.
Coordination‐Driven Terpyridyl Phosphine Pd(II) Gels
Authors: Li Hongmiao , Tan Xin , Zhang Jianyong 
Published: November 2014

AbstractIncorporation of phosphine‐Pd catalytic centers in gel network is an important strategy to develop highly active catalysts. In this contribution we show that catalytically active phosphine‐Pd(II) gels can be readily obtained via reaction of rigid bridging terpyridyl phosphines and Pd(II). The terpyridyl phosphines, Py2P2 and Py2P, contain one 4,2′:6′,4′ ′‐terpyridyl group and two/one diphenylphosphino groups. Reactions of Py2P2/Py2P and Pd(II) in CHCl3‐MeOH afforded the corresponding phosphine‐Pd(II) gels at room temperature or at elevated temperature (40°C). The gelation is driven by formation of metal‐organic coordination. Mild heating is important in triggering the formation of Py2P‐Pd(II) gel. The gels have a coherent, rigid spongy porous network of continuous nanometer‐sized particles. The phosphine‐Pd(II) gels showed high activity in the Suzuki‐Miyaura reactions of aryl bromides under ambient conditions and could be recycled and reused.
A Novel Highly Selective "Turn‐On" Fluorescence Sensor for Silver Ions Based on Schiff Base
Authors: Lin Qi , Yang Qingping , Sun Bin , Wei Taibao , Zhang Youming 
Published: November 2014

AbstractA novel optical chemical sensor L was designed and synthesized for the determination of silver ions. The sensor L was derived from 1‐naphthaldehyde and 3,4,5‐tris(hexadecyloxy)benzohydrazide. The sensor L shows high sensitivity and selectivity for Ag+ detection in comparison to other metal cations (Mg2+, Ca2+, Al3+, Cr3+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+) and has no significant response to other common metal cations. Upon addition of Ag+, the fluorescent emission of the sensor L was enhanced dramatically but other metal cations had no same response. The detection limit for Ag+ was 1.2×10−7 mol/L. Therefore, the sensor L is useful for Ag+ detection with some advantages including sensitivity, selectivity, simplicity and low‐cost.