bluuebunny/crossref_metadata_2025_split huggingface dataset:
A New Dual‐Signalling Electrochemical Sensing Strategy Based on Competitive Host–Guest Interaction of a β‐Cyclodextrin/Poly(N‐acetylaniline)/Graphene‐Modified Electrode: Sensitive Electrochemical Determination of Organic Pollutants
Authors: Zhu Gangbing , Wu Liang , Zhang Xia , Liu Wei , Zhang Xiaohua , Chen Jinhua 
Published: March 2013

AbstractBased on the competitive host–guest interaction between a β‐cyclodextrin/poly(N‐acetylaniline)/electrogenerated‐graphene (β‐CD/PNAANI/EG) film and probe or target molecules, a new dual‐signalling electrochemical sensing method has been developed for the sensitive and selective determination of organic pollutants. As a model system, rhodamine B (RhB) and 1‐aminopyrene (1‐AP) were adopted as the probe and target molecules, respectively. Due to the host–guest interaction, RhB molecules can enter into the hydrophobic inner cavity of β‐CD, and the β‐CD/PNAANI/EG‐modified glassy carbon electrode displays a remarkable oxidation peak due to RhB. In the presence of 1‐AP, competitive association to β‐CD occurs and the RhB molecules are displaced by 1‐AP. This results in a decreased oxidation peak current of RhB and the appearance of an oxidation peak current for 1‐AP, and the changes of these signals correlate linearly with the concentration of 1‐AP. When the value ΔI1‐AP+∣ΔIRhB∣ (ΔI1‐AP and ΔIRhB are the change values of the oxidation peak currents of 1‐AP and RhB, respectively) is used as the response signal to quantitatively determine the concentration of 1‐AP, the detection limit is much lower than that given by using ΔI1‐AP or ΔIRhB as the response signal. This dual‐signalling sensor can provide more sensitive target recognition and will have important applications in the sensitive and selective electrochemical determination of electroactive organic pollutants.
Tricyclometalated Iridium Complexes as Highly Stable Photosensitizers for Light‐Induced Hydrogen Evolution
Authors: Yuan Yong‐Jun , Yu Zhen‐Tao , Gao Hong‐Lin , Zou Zhi‐Gang , Zheng Chao , Huang Wei 
Published: March 2013

AbstractThe development of an efficient and stable artificial photosensitizer for visible‐light‐driven hydrogen production is highly desirable. Herein, a new series of charge‐neutral, heteroleptic tricyclometalated iridium(III) complexes, [Ir(thpy)2(bt)] (1–4; thpy=2,2′‐thienylpyridine, bt=2‐phenylbenzothiazole and its derivatives), were systematically synthesized and their structural, photophysical, and electrochemical properties were established. Three solid‐state structures were studied by X‐ray crystallographic analysis. This design offers the unique opportunity to drive the metal‐to‐ligand charge‐transfer (MLCT) band to longer wavelengths for these iridium complexes. We describe new molecular platforms that are based on these neutral iridium complexes for the production of hydrogen through visible‐light‐induced photocatalysis over an extended period of time in the presence of [Co(bpy)3]2+ and triethanolamine (TEOA). The maximum amount of hydrogen was obtained under constant irradiation over 72 h and the system could regenerate its activity upon the addition of cobalt‐based catalysts when hydrogen evolution ceased. Our results demonstrated that the dissociation of the [Co(bpy)3]2+ catalyst contributed to the loss of catalytic activity and limited the long‐term catalytic performance of the systems. The properties of the neutral complexes are compared in detail to those of two known non‐neutral bpy‐type complexes, [Ir(thpy)2(dtb‐bpy)]+ (5) and [Ir(ppy)2(dtb‐bpy)]+ (6; ppy=2‐phenylpyridine, dtb‐bpy=4,4′‐di‐tert‐butyl‐2,2′‐dipyridyl). This work is expected to contribute toward the development of long‐lasting solar hydrogen‐production systems.
ChemInform Abstract: Hydrothermal Synthesis of Hierarchical LiFePO4 Microspheres for Lithium Ion Battery.
Authors: Wang Qi , Deng SiXu , Wang Hao , Xie Ming , Liu JingBing , Yan Hui 
Published: March 2013

AbstractThe title microspheres are hydrothermally synthesized from (NH4)2HPO4, LiOH, and FeSO4 in sucrose solution (autoclave, 180 °C, 0.5—16 h).
ChemInform Abstract: Synthesis, Structure, and Transport Properties of Type‐I Derived Clathrate Ge46‐xPxSe8‐y (x = 15.4(1); y = 0—2.65) with Diverse Host—Guest Bonding.
Authors: Shevelkov Andrei V. , et al. et al. 
Published: March 2013

AbstractA first clathrate compound with Se guest atoms, [Ge46‐xPx]Se8‐y□y (x = 15.4; y = 0—2.65; □ = vacancy) is prepared from the elements (873 K, 72 h) and characterized by powder and single crystal XRD, SAED, TEM, and TB‐LMTO‐ASA electronic band structure computations.
ChemInform Abstract: {Ta12}/{Ta16} Cluster‐Containing Polytantalotungstates with Remarkable Photocatalytic H2 Evolution Activity.
Authors: Li Shujun , Liu Shumei , Liu Shuxia , Liu Yiwei , Tang Qun , Shi Zhan , Ouyang Shuxin , Ye Jinhua 
Published: March 2013

AbstractCompounds (III) and (VII) are tris‐(peroxotantalum)‐substituted Dawson‐ and Keggin‐type derivatives, whereas (IV) and (VIII) are tetrameric oligomers containing an unprecedented {Ta12} and {Ta16} core, respectively.
ChemInform Abstract: Organocatalyzed Baylis—Hillman Reaction: An Enantioselective Approach.
Authors: Thorat Prashant B. , Goswami Santosh V. , Khade Bhimrao C. , Bhusare Sudhakar R. 
Published: March 2013

AbstractA series of new organocatalysts is designed based on hydrogen bonding motifs and applied to the title reaction.
ChemInform Abstract: N‐Heterocyclic Carbene Complexes of Nickel as Efficient Catalysts for Hydrosilylation of Carbonyl Derivatives.
Authors: Postigo Lorena , Royo Beatriz 
Published: March 2013

AbstractA new Ni‐NHC‐complex displays high activity and excellent tolerance to functional groups in the reduction of aldehydes (I) and ketones (III).
ChemInform Abstract: A Highly Active Bifunctional Iridium Complex with an Alcohol/Alkoxide‐Tethered N‐Heterocyclic Carbene for Alkylation of Amines with Alcohols.
Authors: Bartoszewicz Agnieszka , Marcos Rocio , Sahoo Suman , Inge A. Ken , Zou Xiaodong , Martin‐Matute Belen 
Published: March 2013

AbstractA series of novel iridium complexes possessing chelating [NHC‐alcohol] ligands is prepared.
ChemInform Abstract: Potassium 4‐Iodylbenzenesulfonate: Preparation, Structure, and Application as a Reagent for Oxidative Iodination of Arenes.
Authors: Yusubov Mekhman S. , Yusubova Roza Y. , Nemykin Victor N. , Maskaev Andrey V. , Geraskina Margarita R. , Kirschning Andreas , Zhdankin Viktor V. 
Published: March 2013

AbstractA thermally stable and water‐soluble hypervalent iodine oxidant for oxidative iodination of aromatic substrates is synthesized.
ChemInform Abstract: Room‐Temperature Base‐Free Copper‐Catalyzed Trifluoromethylation of Organotrifluoroborates to Trifluoromethylarenes.
Authors: Huang Yuanyuan , Fang Xin , Lin Xiaoxi , Li Huaifeng , He Weiming , Huang Kuo‐Wei , Yuan Yaofeng , Weng Zhiqiang 
Published: March 2013

AbstractThis reaction runs in the absence of any additional base or oxidant and tolerates a variety of functionalities.
ChemInform Abstract: Synthesis of Five‐ and Six‐Membered Benzocyclic Ketones Through Intramolecular Alkene Hydroacylation Catalyzed by Nickel(0)/N‐Heterocyclic Carbenes.
Authors: Hoshimoto Yoichi , Hayashi Yukari , Suzuki Haruka , Ohashi Masato , Ogoshi Sensuke 
Published: March 2013

AbstractThe convenient method allows the synthesis of indanone and tetralone derivatives.
ChemInform Abstract: Ruthenium‐Catalyzed Direct ortho‐Alkynylation of Arenes with Chelation Assistance.
Authors: Ano Yusuke , Tobisu Mamoru , Chatani Naoto 
Published: March 2013

AbstractThe process allows the synthesis of various o‐substituted bisarenes, which can serve as precursors of polycyclic systems as is demonstrated for the preparation of heteroarene (X).
ChemInform Abstract: Phosphane‐Mediated Domino Synthesis of Tetrasubstituted Furans from Simple Terminal Activated Olefins.
Authors: Wang Jianfang , Zhou Rong , He Zheng‐Rong , He Zhengjie 
Published: March 2013

AbstractA general, mild, and convenient highly efficient synthesis of the title compounds is developed from readily available starting materials with flexible substitution patterns.
ChemInform Abstract: Ir(I)‐Catalyzed C—H Bond Alkylation of C2‐Position of Indole with Alkenes: Selective Synthesis of Linear or Branched 2‐Alkylindoles.
Authors: Pan Shiguang , Ryu Naoto , Shibata Takanori 
Published: March 2013

AbstractThe differences between the N‐acetyl group and the N‐benzoyl group are used to obtain either linear or branched alkylation products.
ChemInform Abstract: Novel One‐Pot Synthesis of 2‐Substituted 3‐Alkoxyisoindolin‐1‐imine Derivatives from 2‐Cyanobenzaldehyde, Amine, and Alcohol.
Authors: Shen Sida , Xu Xingyu , Lei Min , Hu Lihong 
Published: March 2013

AbstractThe additional, efficient method for the preparation of the isoindole skeleton tolerates a broad spectrum of functionalities.
ChemInform Abstract: Highly Diastereo‐ and Enantioselective Organocatalytic One‐Pot Sequential 1,4‐Addition/Dearomative‐Fluorination Transformation.
Authors: Li Feng , Sun Long , Teng Yuou , Yu Peng , Zhao John Cong‐Gui , Ma Jun‐An 
Published: March 2013

AbstractThis reaction yields products with adjacent tertiary and quarternary stereocenters in good yields with high diastereo‐ and enantioselectivities.
ChemInform Abstract: Efficient One‐Pot Synthesis of 1H‐Pyrazolo[1,5‐b]indazoles by a Domino Staudinger—Aza‐Wittig Cyclization.
Authors: Zhao Fen‐Fen , Yan Yan‐Mei , Zhang Rui , Ding Ming‐Wu 
Published: March 2013

AbstractTreatment of azides (I) with triphenylphosphine results in an initial abnormal Staudinger reaction which is followed by intramolecular aza‐Wittig reaction to produce the relatively unknown, biologically important heterocyclic scaffold.
ChemInform Abstract: SBA‐15/TFE (SBA‐15/2,2,2‐Trifluoroethanol) as a Suitable and Effective Metal‐Free Catalyst for the Preparation of the Tri‐ and Tetra‐Substituted Imidazoles via One‐Pot Multicomponent Method.
Authors: Rostamnia Sadegh , Zabardasti Ali 
Published: March 2013

AbstractThe title compounds are obtained in the one‐pot multicomponent reaction between benzil, aromatic aldehydes, amines and/or ammonium acetate.
ChemInform Abstract: Simple and Efficient Protocol for the Synthesis of Novel Dihydro‐1H‐pyrano[2,3‐c]pyrazol‐6‐ones via a One‐Pot Four‐Component Reaction.
Authors: Azzam Sadeq Hamood Saleh , Pasha M. A. 
Published: March 2013

AbstractBa(OH)2 is an efficient catalyst in the fast process if aromatic aldehydes are involved.
ChemInform Abstract: Synthesis of Chromans and 4H‐Chromenes: Exploring the Oxidation of 2H‐Chromenes and Dihydro‐1‐benzoxepines by Hypervalent Iodine(III).
Authors: Ahmad Anees , Silva Luiz F. Jr. 
Published: March 2013

AbstractThe reaction of the heterocyclic substrates with Koser′s reagent HTIB in the presence of orthoesters or alcohols is studied.
ChemInform Abstract: Iron‐Mediated Direct Arylation with Arylboronic Acids Through an Aryl Radical Transfer Pathway.
Authors: Wang Jian , Wang Shan , Wang Gao , Zhang Ji , Yu Xiao‐Qi 
Published: March 2013

AbstractFeS is successfully employed as an efficient catalyst for the direct C‐arylation of quinones, pyridines and related N‐heterocycles.
ChemInform Abstract: FSG‐Hf(NPf2)4 Catalyzed, Environmentally Benign Synthesis of 1,8‐Dioxodecahydroaridines in Water‐Ethanol
Authors: Hong Mei , Xiao Guomin 
Published: March 2013

Abstractvia three‐component one‐pot condensation of various aromatic aldehydes, 5,5‐dimethyl‐1,3‐cyclohexanedione and different aromatic amines or ammonium acetate
ChemInform Abstract: Design and Synthesis of Coumarinyl 1,4‐Benzodioxanes as Potential Antioxidants.
Authors: Das Asish R. , Pal Gargi , Bhattacharyya Pranabes , Ghosh Arnab K. , Mukherjee Debasri , Bandyopadhyay Debasish 
Published: March 2013

AbstractPreliminary investigations reveal that some products exhibit a significant in vitro free hydroxyl radical scavenging activity.
ChemInform Abstract: Significantly Fast Synthesis of S‐Glycosyl N‐Substituted Dithiocarbamate and S‐Glycosyl S′‐Substituted Trithiocarbonate Derivatives under Solvent‐Free Conditions.
Authors: Jana Manas , Misra Anup Kumar 
Published: March 2013

AbstractCarbohydrates (I), (V) and (VIII) are used for the preparation of both types of title compounds, which are suitable for oligosaccharide synthesis.
Relation Between Time of Symptom Onset of ST‐Segment Elevation Myocardial Infarction and Patient Baseline Characteristics: From the National Cardiovascular Data Registry
Authors: Mogabgab Owen , Wiviott Stephen D. , Antman Elliot M. , Foody Joanne M. , Wang Tracy Y. , Sabatine Marc S. , Cannon Christopher P. , Li Shuang , Giugliano Robert P. 
Published: March 2013

AbstractBackgroundThe presence of a morning excess of ST‐segment elevation myocardial infarction (STEMI) has been observed. The relation between patient characteristics and timing of STEMI may provide insight into the biological processes responsible for this phenomenon.HypothesisPatient baseline characteristics will vary with timing of STEMI.MethodsWe performed an analysis using a large national registry of unselected patients with STEMI (N = 45 218). Patients were categorized by time of symptom onset: early (6 am–2 pm), late day (2 pm–10 pm), and overnight (10 pm–6 am) then evaluated for variations in characteristics.ResultsA circadian variation in the timing of symptom onset of STEMI was observed (early 41%, late day 32%, and overnight 26%, P < 0.001). Circadian variations in factors known to alter timing of events were seen, including lower rates of home β‐blocker use, smoking, and diabetes, with early onset of STEMI symptoms. In addition, patients in the 6 am to 2 pm subgroup were more likely older, white race, and male, with higher rates of home aspirin use and lower rates of obesity. Higher rates of coexisting cardiovascular disease, including prior heart failure, 3‐vessel coronary artery disease, and depressed left ventricular ejection fraction, were observed in the overnight group. More robust antiplatelet therapy with home clopidogrel use was not associated with a change in the timing of events.ConclusionsA morning excess of STEMI continues to exist and represents a potential target for preventative strategies. Patient baseline characteristics vary with the onset of STEMI and may reflect a physiologic relationship between these factors and the timing of events.
Library Construction and Biological Evaluation of Enmein‐Type Diterpenoid Analogues as Potential Anticancer Agents
Authors: Li Dahong , Xu Shengtao , Cai Hao , Pei Lingling , Wang Lei , Wu Xiaoming , Yao Hequan , Jiang Jieyun , Sun Yijun , Xu Jinyi 
Published: March 2013

AbstractA library of promising enmein‐type 14‐O‐diterpenoid derivatives was constructed from a commercially available kaurene‐type oridonin by practical and efficient synthetic methods. These synthetic derivatives were evaluated for their antiproliferative activities against a set of four human cancer cell lines. The IC50 values are similar to or improved over those of the parent molecule and paclitaxel, the latter of which was used as a positive control. Compound 29 was further investigated for its apoptotic properties against human hepatocarcinoma Bel‐7402 cells to better understand its mode of action. Moreover, compound 29 was shown to have potent antitumor activity in vivo in studies with a murine model of gastric cancer (MGC‐803 mice). These results warrant further preclinical investigations of these diterpenoid‐based analogues as potential novel anticancer chemotherapeutics.
Unique hues and their stimuli—state of the art
Authors: Kuehni Rolf G. 
Published: March 2013

AbstractThe relationship between the information the visual system gathers at its interface with the outside world and the perceptual reality of four primary hues and the resulting hue circle has been and remains of interest since the second half of the 19th century. Considerable effort has been expended over many decades in determining statistical mean choices of color stimuli that for individuals represent unique hues in given conditions of viewing. In this article, historical and recent data are used to show the present state of knowledge. To have a means of comparison, in this article spectral and display unit stimuli are converted to Munsell hues on basis of dominant or complementary wavelengths of highest chroma data. Relatively good agreement was found between spectral and color sample data, with display data being significantly different in case of unique green. The issue of significant interobserver variability found in all data and its implications are highlighted. Problems with generating simple psychophysical models, particularly related to unique red, are discussed and a brief survey of the current knowledge on neural processing that may lead to unique hue perception is presented. Data still required for a meaningful definition of mean unique hue stimulus data are listed. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 279–287, 2014; Published Online 20 March 2013 in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/col.21793
Simulating Pump–Probe Photoelectron and Absorption Spectroscopy on the Attosecond Timescale with Time‐Dependent Density Functional Theory
Authors: De Giovannini Umberto , Brunetto Gustavo , Castro Alberto , Walkenhorst Jessica , Rubio Angel 
Published: March 2013

AbstractMolecular absorption and photoelectron spectra can be efficiently predicted with real‐time time‐dependent density functional theory. We show herein how these techniques can be easily extended to study time‐resolved pump–probe experiments, in which a system response (absorption or electron emission) to a probe pulse is measured in an excited state. This simulation tool helps with the interpretation of fast‐evolving attosecond time‐resolved spectroscopic experiments, in which electronic motion must be followed at its natural timescale. We show how the extra degrees of freedom (pump‐pulse duration, intensity, frequency, and time delay), which are absent in a conventional steady‐state experiment, provide additional information about electronic structure and dynamics that improve characterization of a system. As an extension of this approach, time‐dependent 2D spectroscopy can also be simulated, in principle, for large‐scale structures and extended systems.
Angle‐Resolved Strong‐Field Ionization of Polyatomic Molecules: More than the Orbitals Matters
Authors: Njoya Oumarou , Matsika Spiridoula , Weinacht Thomas 
Published: March 2013

AbstractWe compare the time‐ and angle‐dependent strong‐field ionization yields of three molecules with very similar electronic structure. A pump pulse in the deep ultraviolet excites 1,3‐cyclohexadiene, α‐terpinene, and α‐phellandrene to their first excited state. The latter two molecules are alkyl‐substituted 1,3‐cyclohexadiene systems. We then measure the strong‐field ionization yield due to a near infrared probe pulse as a function of delay and angle between pump and probe polarization vectors. Ab initio electronic structure calculations allow us to associate the parent ion yields with removal of an electron from a LUMO orbital (occupied after excitation by the pump). Despite the fact that the LUMO orbitals for these molecules are very similar, the angle‐dependent yields are very different, indicating that it is not the orbital shape alone which determines angle‐dependent ionization yields.
A cross‐layer optimization for maximum‐revenue‐based multicast in multichannel multiradio wireless mesh networks
Authors: Yang Wen‐Lin , Hong Wan‐Ting 
Published: March 2013

SUMMARYGiven a video/audio streaming system installed on a multichannel multiradio wireless mesh network, we are interested in a problem concerning about how to construct a delay‐constrained multicast tree to support concurrent interference‐free transmissions so that the number of serviced mesh clients is maximized. In this paper, we propose a heuristic approach called cross‐layer and load‐oriented (CLLO) algorithm for the problem. On the basis of the cross‐layer design paradigm, our CLLO algorithm can consider application demands, multicast routing, and channel assignment jointly during the formation of a channel‐allocated multicast tree. The experimental results show that the proposed CLLO outperforms the layered approaches in terms of the number of serviced mesh clients and throughputs. This superiority is due to information from higher layers can be used to guide routing selection and channel allocation at the same time. As a result, the CLLO algorithm can explore more solution spaces than the traditional layered approaches. In addition to that, we also propose a channel adjusting procedure to enhance the quality of channel‐allocated multicast trees. According to our simulations, it is proved to be an effective method for improving the performance of the proposed CLLO algorithm. Copyright © 2013 John Wiley & Sons, Ltd.
Genetic evidence for male‐biased dispersal in theQinghai toad‐headed agamidPhrynocephalus vlangaliiand its potential link to individual social interactions
Authors: Qi Yin , Yang Weizhao , Lu Bin , Fu Jinzhong 
Published: March 2013

AbstractSex‐biased dispersal has profound impacts on a species' biology and several factors have been attributed to its evolution, including mating system, inbreeding avoidance, and social complexity. Sex‐biased dispersal and its potential link to individual social interactions were examined in theQinghai toad‐headed agamid (Phrynocephalus vlangalii). We first determined the pattern of sex‐biased dispersal using population genetic methods. A total of 345 specimens from 32 sites in theQaidamBasin were collected and genotyped for nine microsatelliteDNAloci. Both individual‐based assignment tests and allele frequency‐based analyses were conducted. Females revealed much more genetic structure than males and all results were consistent with male‐biased dispersal. First‐generation migrants were also identified by genetic data. We then examined eight social interaction‐related morphological traits and explored their potential link to sex‐biased dispersal. Female residents had larger heads and longer tails than female migrants. The well‐developed signal system among females, coupled with viviparity, might make remaining on natal sites beneficial, and hence promote female philopatry. Dominant females with larger heads were more likely to stay. Contrary to females, male migrants had larger heads and belly patches than residents, suggesting that dispersal might confer selective advantages for males. Such advantages may include opportunities for multiple mating and escaping from crowded sites. Large belly patches and several other morphological traits may assist their success in obtaining mates during dispersal. Furthermore, a relatively high relatedness (R = 0.06) among females suggested that this species might have rudimentary social structure. Case studies in “less” social species may provide important evidence for a better understanding of sex‐biased dispersal.