bluuebunny/crossref_metadata_2025_split huggingface dataset:
Relationship between Carbon Nanotube Structure and Electrochemical Behavior: Heterogeneous Electron Transfer at Electrochemically Activated Carbon Nanotubes
Authors: Pumera Martin , Sasaki Toshio , Iwai Hideo 
Published: September 2008

AbstractThe electrochemical activation of multiwalled carbon nanotubes (MWCNTs) (at potentials of 1.5–2.0 V vs Ag/AgCl for 60–360 s) results in significantly increased rate constants (${k_{{\rm{obs}}}^0 }$) for heterogeneous electron‐transfer with [Fe(CN)6]3−/4− (from 8.34×10−5 cm s−1 for as‐received MWCNTs to 3.67×10−3 cm s−1 for MWCNTs that were electrochemically activated at 2.0 V for 180 s). The increase in the value of ${k_{{\rm{obs}}}^0 }$ arises from the introduction of wall defects exposing edge planes of the MWCNTs, as observed by high‐resolution TEM. The density of the edge plane defects increases from almost zero (for as‐received MWCNTs) to 3.7 % (for MWCNTs electrochemically activated at 2.0 V for 180 s). High‐resolution X‐ray photoelectron spectroscopy (HR‐XPS), Raman spectroscopy, and electrochemical impedance spectroscopy were used to gain a better understanding of the phenomena. HR‐XPS revealed that the increase in electrochemical activation potential increases the number of oxygen‐containing groups on the surface of carbon nanotubes.
Self‐Assembled Organic Microtubes from Amphiphilic Molecules
Authors: Lee Ho Yong , Nam Seong Ryong , Hong Jong‐In 
Published: September 2008

AbstractGetting the sizes sorted out: In recent years, there have been increasing numbers of reports about self‐assembled nano‐ or microtubular structures because of their potential uses in a variety of technical applications, which are largely determined by the tube sizes. This Focus Review highlights microsized self‐assembled organic tubular structures formed in aqueous solutions and organic solvents.magnified imageIn recent years, there have been increasing numbers of reports about self‐assembled nano‐ or microtubular structures, because they have potential uses in nanofabrication, purification, medical, and encapsulation applications. A wide range of tubular structures have been constructed by the self‐assembly of amphiphilic molecules in aqueous solution or organic solvents. The diameters of self‐assembled tubular structures range between 10 nm and 30 μm. One of the most important factors that determine their suitability for technical applications is the size of the tubes. Therefore, analyzing and sorting tubular structures according to their size is essential. This Focus Review highlights microsized self‐assembled organic tubular structures formed in aqueous solutions and organic solvents.
A critical evaluation of a flow‐cell based on a liquid core waveguide for chemiluminescence measurements
Authors: Sanchez Mariana A. , Rocha Fábio R. P. 
Published: September 2008

AbstractLiquid‐core waveguides (LCWs), devices that constrain the emitted radiation minimizing losses during the transport, are an alternative to maximize the amount of detected radiation in luminescence. In this work, the performance of a LCW flow‐cell was critically evaluated for chemiluminescence measurements, by using as model the oxidation of luminol by hydrogen peroxide or hypochlorite. An analytical procedure for hypochlorite determination was also developed, with linear response in the range 0.2–3.8 mg/L (2.7–51 µmol/L), a detection limit estimated as 8 µg/L (0.64 µmol/L) at the 99.7% confidence level and luminol consumption of 50 µg/determination. The coefficients of variation were 3.3% and 1.6% for 0.4 and 1.9 mg/L ClO−, respectively, with a sampling rate of 164 determinations/h. The procedure was applied to the analysis of Dakin's solution samples, yielding results in agreement with those obtained by iodometric titration at the 95% confidence level. Copyright © 2008 John Wiley & Sons, Ltd.
1‐, 2‐, and 4‐Ethynylpyrenes in the Structure of Twisted Intercalating Nucleic Acids: Structure, Thermal Stability, and Fluorescence Relationship
Authors: Filichev Vyacheslav V. , Astakhova Irina V. , Malakhov Andrei D. , Korshun Vladimir A. , Pedersen Erik B. 
Published: September 2008

AbstractA postsynthetic, on‐column Sonogashira reaction was applied on DNA molecules modified by 2‐ or 4‐iodophenylmethylglycerol in the middle of the sequence, to give the corresponding ortho‐ and para‐twisted intercalating nucleic acids (TINA) with 1‐, 2‐, and 4‐ethynylpyrene residues. The convenient synthesis of 2‐ and 4‐ethynylpyrenes started from the hydrogenolysis of pyrene that has had the sulfur removed and separation of 4,5,9,10‐tetrahydropyrene and 1,2,3,6,7,8‐hexahydropyrene, which were later converted to the final compounds by successive Friedel–Crafts acetylation, aromatization by 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone, and a Vilsmeier–Haack–Arnold transformation followed by a Bodendorf fragmentation. Significant alterations in thermal stability of parallel triplexes and antiparallel duplexes were observed upon changing the attachment of ethynylpyrenes from para to ortho in homopyrimidine TINAs. Thus, for para‐TINAs the bulge insertion of an intercalator led to high thermal stability of Hoogsteen‐type parallel triplexes and duplexes, whereas Watson–Crick‐type duplexes were destabilized. In the case of ortho‐TINA, both Hoogsteen and Watson–Crick‐type complexes were stabilized. Alterations in the thermal stability were highly influenced by the ethynylpyrene isomers used. This also led to TINAs with different changes in fluorescence spectra depending on the secondary structures formed. Stokes shift of approximately 100 nm was detected for pyren‐2‐ylethynylphenyl derivatives, whereas values for 1‐ and 4‐ethynylpyrenylphenyl conjugates were 10 and 40 nm, respectively. In contrast with para‐TINAs, insertion of two ortho‐TINAs opposite each other in the duplex as a pseudo‐pair resulted in formation of an excimer band at 505 nm for both 1‐ and 4‐ethynylpyrene analogues, which was also accompanied with higher thermal stability.
Theoretical Study on the Factors Controlling the Stability of the Borate Complexes of Ribose, Arabinose, Lyxose, and Xylose
Authors: Šponer Judit E. , Sumpter Bobby G. , Leszczynski Jerzy , Šponer Jiří , Fuentes‐Cabrera Miguel 
Published: September 2008

AbstractRecent experimental studies suggest that complexation with borate minerals stabilizes ribose, and that the borate complex of ribose is more stable than those of related aldopentoses, that is, arabinose, lyxose, and xylose. These findings have revived the debate on the plausibility of the RNA‐world theory, because they provide an explanation for the stabilization and selection of ribose in prebiotic conditions. In this paper we unravel the factors that make the ribose–borate complex the most stable one. For this purpose, we have investigated the structure and stability of the ribose–, arabinose–, lyxose–, and xylose–borate complexes using density functional theory and a continuum solvent approach. The computed results reveal that in the aldopentose–borate complexes, the electrostatic field of the borate is strong enough to change the orientation of the nearby hydroxyl groups compared to noncomplexed aldopentoses. In addition, we show that the distinct stability of the ribose–borate 2:1 complex can be attributed to 1) a strong hydrogen bond between the ribose 3‐OH and one of the negatively charged borate oxygen atoms, and 2) a favorable contact between the aqueous medium and the 5‐CH2OH group due to the space separation between the 5‐CH2OH group and the borate anion.
Effect of the Nature of the Metal Atom on Hydrogen Bonding and Proton Transfer to [Cp*MH3(dppe)]: Tungsten versus Molybdenum
Authors: Belkova Natalia V. , Besora Maria , Baya Miguel , Dub Pavel A. , Epstein Lina M. , Lledós Agustí , Poli Rinaldo , Revin Pavel O. , Shubina Elena S. 
Published: September 2008

AbstractThe hydrogen‐bonding and proton‐transfer pathway to complex [Cp*W(dppe)H3] (Cp*=η5‐C5Me5; dppe=Ph2PCH2CH2PPh2) was investigated experimentally by IR, NMR, UV/Vis spectroscopy in the presence of fluorinated alcohols, p‐nitrophenol, and HBF4, and by using DFT calculations for the [CpW(dhpe)H3] model (Cp=η5‐C5H5; dhpe=H2PCH2CH2PH2) and for the real system. A study of the interaction with weak acids (CH2FCH2OH, CF3CH2OH, (CF3)2CHOH) allowed the determination of the basicity factor, Ej=1.73±0.01, making this compound the most basic hydride complex reported to date. A computational investigation revealed several minima for the [CpW(dhpe)H3] adducts with CF3CH2OH, (CF3)2CHOH, and 2(CF3)2CHOH and confirms that these interactions are stronger than those established by the Mo analogue. Their geometries and relative energies are closely related to those of the homologous Mo systems, with the most stable adducts corresponding to H bonding with M–H sites, however, the geometric and electronic parameters reveal that the metal center plays a greater role in the tungsten systems. Proton‐transfer equilibria are observed with the weaker proton donors, the proton‐transfer step for the system [Cp*W(dppe)H3]/HOCH(CF3)2 in toluene having ΔH=(−3.9±0.3) kcal mol−1 and ΔS=(−17±2) cal mol−1 K−1. The thermodynamic stability of the proton‐transfer product is greater for W than for Mo. Contrary to the Mo system, the protonation of the [Cp*W(dppe)H3] appears to involve a direct proton transfer to the metal center without a nonclassical intermediate, although assistance is provided by a hydride ligand in the transition state.
Gold‐ and Silver‐Catalyzed Tandem Amination/Ring Expansion of Cyclopropyl Methanols with Sulfonamides as an Expedient Route to Pyrrolidines
Authors: Rao Weidong , Chan Philip Wai Hong 
Published: September 2008

AbstractAn efficient synthetic route to pyrrolidines that relies on AuCl/AgOTf‐catalyzed tandem amination/ring expansion of substituted cyclopropyl methanols with sulfonamides is reported herein. The reactions proceed rapidly at 100 °C with catalyst loadings as low as 2 mol % and produce the pyrrolidine products in yields of 30–95 %. The method was shown to be applicable to a broad range of cyclopropyl methanols, including unactivated ones, and sulfonamide substrates containing electron‐withdrawing, electron‐donating, and sterically‐demanding substituents. The mechanism is suggested to involve activation of the alcohol substrate by the AuCl/AgOTf catalyst, followed by ionization of the starting material, which causes ring opening of the cyclopropane moiety and trapping by the sulfonamide nucleophile. The resultant aminated acyclic intermediate undergoes subsequent intramolecular hydroamination to give the pyrrolidine.
β‐Cyclodextrin‐Appended Giant Amphiphile: Aggregation to Vesicle Polymersomes and Immobilisation of Enzymes
Authors: Felici Marco , Marzá‐Pérez María , Hatzakis Nikos S. , Nolte Roeland J. M. , Feiters Martin C. 
Published: September 2008

AbstractA giant amphiphile consisting of polystyrene end‐capped with permethylated β‐cyclodextrin was synthesised and found to form vesicular structures when injected as a solution in THF into water. The ability of the cyclodextrins on the surface of the polymersomes to form inclusion complexes with hydrophobic compounds was tested by carrying out a competition experiment with a fluorescent probe sensitive to the polarity of the surrounding medium. It was found that 1‐adamantol can displace the fluorescent probe from the cavities of the cyclodextrin moieties of the polymersomes. The recognition of molecules by cell membranes in nature is often based on interactions with specific membrane receptors. To mimic this behaviour, the enzyme horseradish peroxidase was modified with adamantane groups through a poly(ethylene glycol) spacer and its interaction with the polymersomes was investigated. It was established that the presence of adamantane moieties on each enzyme allowed a host–guest interaction with the multifunctional surface of the polymersomes.
ChemInform Abstract: Structures of Neutral Au7, Au19, and Au20Clusters in the Gas Phase.
Authors: Gruene Philipp , Rayner David M. , Redlich Britta , van der Meer Alexander F. G. , Lyon Jonathan T. , Meijer Gerard , Fielicke Andre 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Formation of Co3+ Octahedra and Tetrahedra in YBaCo4O8.1.
Authors: Chmaissem O. , Zheng H. , Huq A. , Stephens P. W. , Mitchell J. F. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A New Promising Scintillator Ba3InB9O18.
Authors: Cai Gemei , Chen X. L. , Wang W. Y. , Lou Y. F. , Liu J. , Zhao J. T. , Chen H. H. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Neutron Powder Diffraction Study of the Crystal and Magnetic Structures of BiNiO3 at Low Temperature.
Authors: Carlsson Sandra J. E. , Azuma Masaki , Shimakawa Yuichi , Takano Mikio , Hewat Alan , Attfield J. Paul 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Cotemplating Ionothermal Synthesis of a New Open‐Framework Aluminophosphate with Unique Al/P Ratio of 6/7.
Authors: Xing Hongzhu , Li Jiyang , Yan Wenfu , Chen Peng , Jin Zhao , Yu Jihong , Dai Sheng , Xu Ruren 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A One‐Dimensional Double‐Chain Compound Constructed from CeIII Cations and [α‐SiW11O39]8‐ Anions: Synthesis, Crystal Structure and Magnetic Properties.
Authors: Hu Mi‐Xia , Chen Ya‐Guang , Shi Dong‐Mei , Pang Hai‐Jun , Zhang Chun‐Jing 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Hydrothermal Synthesis, Structure, and Magnetic Properties of Pu(SeO3)2.
Authors: Bray Travis H. , Skanthakumar S. , Soderholm L. , Sykora Richard E. , Haire Richard G. , Albrecht‐Schmitt Thomas E. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Polyoxometalate‐Mediated Self‐Assembly of Single‐Molecule Magnets: {[XW9O34]2 [MnIII4MnII2O4 (H2O)4]}12‐.
Authors: Murrie Mark , et al. et al. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis, Structure, and Magnetic Properties of Ba2Cu2US5.
Authors: Zeng Hui‐yi , Yao Jiyong , Ibers James A. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis, Structure, Magnetic Properties and Structural Distortion under High Pressure of a New Osmate, Sr2CuOsO6.
Authors: Lufaso Michael W. , Gemmill William R. , Mugavero Samuel J. III , Kim Seung‐Joo , Lee Yongjae , Vogt Thomas , zur Loye Hans‐Conrad 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Control of up to Five Stereocenters in a Cascade Reaction: Synthesis of Highly Functionalized Five‐Membered Rings.
Authors: Li Hao , Loh Teck‐Peng 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Diphosphite Ligands Derived from Carbohydrates as Stabilizers for Ruthenium Nanoparticles: Promising Catalytic Systems in Arene Hydrogenation.
Authors: Gual Aitor , Axet M. Rosa , Philippot Karine , Chaudret Bruno , Denicourt‐Nowicki Audrey , Roucoux Alain , Castillon Sergio , Claver Carmen 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Mild Copper(I) Iodide/β‐Keto Ester Catalyzed Coupling Reactions of Styryl Bromides with Phenols, Thiophenols, and Imidazoles.
Authors: Bao Weiliang , Liu Yunyun , Lv Xin 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Gold(I)‐Catalyzed Intramolecular Hydroamination of Unactivated C=C Bonds with Alkyl Ammonium Salts.
Authors: Bender Christopher F. , Widenhoefer Ross A. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Highly Enantioselective [2,3]‐Wittig Rearrangement of Functionalized Allyl Benzyl Ethers: A Novel Approach to Lignan Synthesis.
Authors: Hirokawa Yoshimi , Kitamura Maria , Maezaki Naoyoshi 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Aerobic Alcohol Oxidation by Ruthenium Species Stabilized on Nanocrystalline Magnesium Oxide by Basic Ionic Liquids.
Authors: Kantam M. Lakshmi , Pal Ujjwal , Sreedhar B. , Bhargava Suresh , Iwasawa Yasuhiro , Tada Mizuki , Choudary B. M. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: β‐Ketoimine as an Efficient Ligand for Copper‐Catalyzed N‐Arylation of Nitrogen‐Containing Heterocycles with Aryl Halides.
Authors: Xue Fei , Cai Chengyi , Sun Hongmei , Shen Qi , Rui Jiao 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Catalytic Enantioselective Addition of Diorganozinc Reagents to Vinyl Sulfones.
Authors: Desrosiers Jean‐Nicolas , Bechara William S. , Charette Andre B. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Fluorinated Johnson Reagent for Transfer‐Trifluoromethylation to Carbon Nucleophiles.
Authors: Noritake Shun , Shibata Norio , Nakamura Shuichi , Toru Takeshi , Shiro Motoo 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Boron Trifluoride—Diethyl Etherate Complex Mediated Allylation of Baylis—Hillman Adducts: A Facile Synthesis of 1,5‐Dienes.
Authors: Yadav Jhillu S. , Reddy Basi V. Subba , Mandal Satadru S. , Singh Ashutosh Pratap , Basak Ashok K. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Preparation of Alkyl and Aryl Chlorodifluoromethyl Ethers Using BrF3.
Authors: Hagooly Youlia , Sasson Revital , Welch Michael J. , Rozen Shlomo 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Photosensitized Tetrahydropyran Transfer.
Authors: Oates R. P. , Jones Paul B. 
Published: September 2008

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.