bluuebunny/crossref_metadata_2025_split huggingface dataset:
Complexes between Lithium Cation and Diphenylalkanes in the Gas Phase: The Pincer Effect
Authors: Gal Jean‐François , Maria Pierre‐Charles , Mó Otilia , Yáñez Manuel , Kuck Dietmar 
Published: August 2006

AbstractThe gas‐phase lithium cation basicities (LCB values, Gibbs free energies of binding) of α,ω‐diphenylalkanes Ph‐(CH2)n‐Ph (n=2, 3, or 7) and 1,1‐diphenylethane Ph‐CH(Me)‐Ph were investigated by means of Fourier‐transform ion cyclotron resonance (FTICR) mass spectrometry. Their structures, and those of the corresponding Li+complexes were optimized at the B3LYP/6‐31G(d) level and their relative stabilities calculated at the B3LYP/6‐311+G(3df,2p)//B3LYP/6‐31G(d) level. Whereas the most stable conformers of the free diphenylalkanes were found to adopt a completely stretched aliphatic chain connecting the two benzene rings, the most stable Li+complexes correspond to conformers in which the alkali metal cation interacts simultaneously with both benzene rings through the folding of the aliphatic chain (“pincer effect”). This chelation brings about a significant enhancement of the Li+binding enthalpies (LBE values), which were calculated to be approximately 75 kJ mol−1higher than those evaluated for conventional (singly coordinated) π complexes in which the metal cation interacts with only one of the benzene rings. The increase of the corresponding lithium cation basicities, however, (Gibbs free energies of Li+binding, LCB values) was calculated to be smaller by approximately 15 kJ mol−1as the pincer effect is entropically disfavored. The good agreement between the calculated LCB values, assuming a statistical distribution of the different conformers present in the gas phase, and the experimental LCB values measured by means of FTICR mass spectrometry are considered indirect evidence of the existence of the pincer effect.
Solvent Effects on the Thermal and Photochemical Reactions of 4′‐Iodo‐8‐methoxyflavylium and Their Consequences on the Coloring Phenomena Caused by Anthocyanins in Plants
Authors: Gomes Raquel , Parola A. Jorge , Lima João C. , Pina Fernando 
Published: August 2006

AbstractThe chemistry and photochemistry of the compound 4′‐iodo‐8‐methoxyflavylium tetrafluoroborate was studied in solvent mixtures of water and ethanol. The trans‐chalcone form (Ct) is always the most stable species at equilibrium. In particular, for the first time, Ct and not the flavylium cation is reported as the most stable species in mixtures containing water at pH 1.0. The rate of Ct formation as a function of the water content exhibits a bell‐shaped dependence, showing a maximum at approximately 50 % water. These trends are explained by a slower cis–trans isomerization in ethanol relative to that in water due to the expected stabilization in polar solvents of the zwitterionic intermediate; on the other hand, the decrease in the concentration of cis‐chalcone (Cc) in the pseudoequilibrium with increasing water content, gives rise to a decrease in the rate of Ct formation (kobs=kreal[Cc]). The hydration reaction was found to be much more efficient when water is present in low concentrations. This result has important consequences for the interpretation of the coloring phenomena caused by anthocyanins in plants, as well as for applications of flavylium compounds in the field of optical memories.
One‐Electron Oxidation Pathways during β‐Cyclodextrin‐Modified TiO2 Photocatalytic Reactions
Authors: Tachikawa Takashi , Tojo Sachiko , Fujitsuka Mamoru , Majima Tetsuro 
Published: August 2006

AbstractThe photocatalytic one‐electron oxidation reactions of aromatic sulfides using the carboxymethyl‐β‐cyclodextrin (CM‐β‐CD)‐modified TiO2 nanoparticles (TiO2/CM‐β‐CD) were investigated by using nano‐ and femtosecond transient absorption spectroscopies. The one‐electron oxidation processes of the substrate (S) by the valence band hole (hVB+) at the TiO2 surface and the trapped hole at the adsorption site of the CM‐β‐CD (hCD+) were examined. The transient absorption spectra and time traces observed for the charge carriers and the radical cation of S (S.+) revealed that the one‐electron oxidation reaction of S during the nano‐ and femtosecond laser flash photolyses of TiO2/CM‐β‐CD is significantly enhanced relative to bare TiO2. The kinetics of the decay and the dimerization processes between S.+s are discussed on the basis of the results obtained by the pulse radiolysis technique.
Relationship between Incoherent Excitation Energy Migration Processes and Molecular Structures in Zinc(II) Porphyrin Dendrimers
Authors: Cho Sung , Li Wei‐Shi , Yoon Min‐Chul , Ahn Tae Kyu , Jiang Dong‐Lin , Kim Jiwon , Aida Takuzo , Kim Dongho 
Published: August 2006

AbstractMultiporphyrin dendrimers are among the most promising architectures to mimic the oxygenic light‐harvesting complex because of their structural similarities and synthetic convenience. The overall geometries of dendrimers are determined by the core structure, the type of dendron, and the number of generations of interior repeating units. The rigid core and bulky volume of exterior porphyrin units in multiporphyrin dendrimers give rise to well‐ordered three‐dimensional structures. As the number of generations of interior repeating units increases, however, the overall structures of dendrimers become disordered and randomized due to the flexibility of the repeating units. To reveal the relationship between molecular structure and processes of excitation‐energy migration in multiporphyrin dendrimers, we calculated the molecular structure and measured the time‐resolved transient absorption and fluorescence anisotropy decays for various hexaarylbenzene‐anchored polyester zinc(II) porphyrin dendrimers along with three types of porphyrin dendrons as references. We found that the congested two‐branched type dendrimers exhibit more efficient energy migration processes than one‐ or three‐branched type dendrimers because of multiple energy migration pathways, and the three‐dimensional packing efficiency of dendrimers strongly depends on the type of dendrons.
Individual Dissolution of Single‐Walled Carbon Nanotubes in Aqueous Solutions of Steroid or Sugar Compounds and Their Raman and Near‐IR Spectral Properties
Authors: Ishibashi Ayumi , Nakashima Naotoshi 
Published: August 2006

AbstractThe individual solubilization of single‐walled carbon nanotubes (SWNTs), achieved by using ten different anionic‐, zwitterionic‐, and nonionic‐steroid biosurfactants and three different sugar biosurfactants, was examined. Aqueous micelles of anionic cholate analogues, such as sodium cholate (SC), sodium deoxycholate (SDC), sodium taurocholate (STC), sodium taurodeoxycholate (STDC), sodium glycocholate (SGC), as well as N,N‐bis(3‐D‐gluconamidopropyl)cholamide (BIGCHAP) and N,N‐bis(3‐D‐gluconamidopropyl)deoxycholamide (deoxy‐BIGCHAP), exhibited good abilities to dissolve the SWNTs individually. Aqueous micelles of nonionic biosurfactants, such as sucrose monocholate (SMC), n‐octyl‐β‐D‐glucoside (OG), n‐decyl‐β‐D‐maltoside (DM), and n‐decanoyl‐N‐methylglucamide (MEGA‐10), could dissolve the SWNTs, however, the solubilization abilities were weaker than those of the anionic cholate analogues. In sharp contrast, the solubilization abilities of the zwitterionic micelles of 3‐[(3‐cholamidopropyl)dimethylammonio]propanesulfonic acid (CHAPS) and 3‐[(3‐cholamidopropyl)dimethylammonio]‐2‐hydroxypropanesulfonic acid (CHAPSO) were very low, and almost zero for OG. It is evident that the chemical structures, in particular the substituent groups of the surfactants, play an important role in the solubilization of SWNTs. The near‐IR photoluminescence behaviors of the SWNTs dissolved in aqueous micelles and in 1 mM biosurfactants were investigated. The chirality indices of the SWNTs dissolved in these solutions depend on the chemical structures of the biosurfactants. The Raman spectra of the SWNTs dissolved in a 1 mM solution of SC suggest the selective extraction of the metallic SWNTs. Finally, a possible solubilization mechanism using steroid surfactants is described. The SWNTs dissolved individually in water‐containing biocompounds are useful in many areas of nano‐ and materials chemistry.
Novel Properties from Experimental Charge Densities: An Application to the Zwitterionic Neurotransmitter Taurine
Authors: Waller M. P. , Howard S. T. , Platts J. A. , Piltz R. O. , Willock D. J. , Hibbs D. E. 
Published: August 2006

AbstractThe charge distribution of taurine (2‐aminoethane‐sulfonic acid) is revisited by using an orbital‐based method that describes the density in a fixed molecular orbital basis with variable orbital occupation numbers. A new neutron data set is also employed to explore whether this improves the deconvolution of thermal motion and charge density. A range of molecular properties that are novel for experimentally determined charge densities are computed, including Weinhold population analysis, Mayer bond orders, and local kinetic energy densities, in addition to charge topological analysis and quantum theory of atoms‐in‐molecules (QTAIM) integrated properties. The ease with which a distributed multipole analysis can be performed on the fitted density matrix makes it straightforward to compute molecular moments, the lattice energy, and the electrostatic interaction energies of molecules removed from the crystal. Results are compared with high‐level (QCISD) gas‐phase calculations and band structure calculations employing density functional theory. Finally, the avenues available for extending the range of molecular properties that can be calculated from experimental charge densities still further using this approach are discussed.
Density Functional Theory Study of 10‐Atom Germanium Clusters: Effect of Electron Count on Cluster Geometry.
Authors: King R. B. , Silaghi‐Dumitrescu I. , Uja M. M. 
Published: August 2006

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, please click on HTML or PDF.
Lanthanoid(III) Oxide Chloride Oxoselenates(IV): A Fascinating Class of Multinary Compounds.
Authors: Schleid Thomas , Wontcheu Joseph 
Published: August 2006

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, please click on HTML or PDF.
Three Structure Types for Strontium Copper(I) Lanthanide(III) Selenides SrCuLnSe3 (Ln: La, Gd, Lu).
Authors: Strobel Sabine , Schleid Thomas 
Published: August 2006

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, please click on HTML or PDF.
Synthesis of a New NASICON‐Type Blue Luminescent Material.
Authors: Masui Toshiyuki , Koyabu Kazuhiko , Tamura Shinji , Imanaka Nobuhito 
Published: August 2006

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, please click on HTML or PDF.
Synthesis of New Green Emitting Phosphors Based on Rare Earth Oxycarbonates.
Authors: Koyabu Kazuhiko , Mayama Yuhei , Masui Toshiyuki , Imanaka Nobuhito 
Published: August 2006

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, please click on HTML or PDF.
New Type of Potassium Ion Conducting Solid Based on Lanthanum Oxysulfate.
Authors: Yamamoto Shohei , Tamura Shinji , Imanaka Nobuhito 
Published: August 2006

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, please click on HTML or PDF.
Anion Composition Control and Magnetic Short‐ and Long‐Range Order in Transition Metal Oxide Hydrides.
Authors: Bowman A. , Claridge J. B. , Rosseinsky M. J. 
Published: August 2006

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, please click on HTML or PDF.
Structure and Physical Properties of Ternary Uranium Transition‐Metal Antimonides U3MSb5 (M: Zr, Hf, Nb).
Authors: Tkachuk Andriy V. , Muirhead Craig P. T. , Mar Arthur 
Published: August 2006

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, please click on HTML or PDF.
System Ln—Fe—O (Ln: Ho, Er): Thermodynamic Properties of Ternary Oxides Using Differential Scanning Calorimetry and Solid‐State Electrochemical Cells.
Authors: Parida S. C. , Rakshit S. K. , Dash S. , Singh Ziley , Sen B. K. , Venugopal V. 
Published: August 2006

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, please click on HTML or PDF.
Primary Reaction Steps of Al‐13 Clusters in an HCl Atmosphere: Snapshots of the Dissolution of a Base Metal.
Authors: Burgert Ralf , Stokes Sarah T. , Bowen Kit H. , Schnoeckel Hansgeorg 
Published: August 2006

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, please click on HTML or PDF.
The Metathesis Reactions of [SNS][SbF6] and [SN][AsF6] with Li[Al(OC(CF3)3)4] in Liquid SO2.
Authors: Knapp Carsten , Mailman Aaron , Nikiforov Grigory B. , Passmore Jack 
Published: August 2006

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, please click on HTML or PDF.
Are Ionic Liquids Really a Boon for the Synthesis of Inorganic Materials? A General Method for the Fabrication of Nanosized Metal Fluorides.
Authors: Jacob David S. , Bitton Liora , Grinblat Judith , Felner Israel , Koltypin Yuri , Gedanken Aharon 
Published: August 2006

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, please click on HTML or PDF.
Synthesis and Crystal Structure of Li4BH4(NH2)3.
Authors: Chater Philip A. , David William I. F. , Johnson Simon R. , Edwards Peter P. , Anderson Paul A. 
Published: August 2006

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, please click on HTML or PDF.
CuInS2 Films for Photovoltaic Applications Deposited by a Low‐Cost Method.
Authors: Todorov T. , Cordoncillo E. , Sanchez‐Royo J. F. , Carda J. , Escribano P. 
Published: August 2006

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, please click on HTML or PDF.
Enantioselective Hydrogenation of Diaryl‐Substituted α,β‐Unsaturated Nitriles.
Authors: Wabnitz Tobias C. , Rizzo Simona , Goette Carsten , Buschauer Armin , Benincori Tiziana , Reiser Oliver 
Published: August 2006

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, please click on HTML or PDF.
Functionalized Chiral Ionic Liquids as Highly Efficient Asymmetric Organocatalysts for Michael Addition to Nitroolefins.
Authors: Luo Sanzhong , Mi Xueling , Zhang Long , Liu Song , Xu Hui , Cheng Jin‐Pei 
Published: August 2006

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, please click on HTML or PDF.
4‐trans‐Amino‐Proline Based Di‐ and Tetrapeptides as Organic Catalysts for Asymmetric C—C Bond Formation Reactions.
Authors: Tsogoeva Svetlana B. , Jagtap Sunil B. , Ardemasova Zoya A. 
Published: August 2006

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, please click on HTML or PDF.
Enantioselective Cyanosilylation of Aldehydes Catalyzed by a Diastereomeric Mixture of Atropisomeric Thioureas.
Authors: Steele Rebecca M. , Monti Chiara , Gennari Cesare , Piarulli Umberto , Andreoli Federico , Vanthuyne Nicolas , Roussel Christian 
Published: August 2006

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, please click on HTML or PDF.
Chiral Silanes via Asymmetric Hydrosilylation with Catalytic CuH.
Authors: Lipshutz Bruce H. , Tanaka Naoki , Taft Benjamin R. , Lee Ching‐Tien 
Published: August 2006

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, please click on HTML or PDF.
Rhodium‐Catalyzed Asymmetric Cyclization/Hydroboration of 1,6‐Enynes.
Authors: Kinder Robert E. , Widenhoefer Ross A. 
Published: August 2006

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, please click on HTML or PDF.
Highly Diastereoselective Asymmetric Mannich Reactions of 1,3‐Dicarbonyls with Acyl Imines.
Authors: Ting Amal , Lou Sha , Schaus Scott E. 
Published: August 2006

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, please click on HTML or PDF.
Asymmetric Synthesis of Trifluoromethylphenyl Cyclopropanes Catalyzed by Chiral Metalloporphyrins.
Authors: Le Maux Paul , Juillard Sandrine , Simonneaux Gerard 
Published: August 2006

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, please click on HTML or PDF.
Diastereoselective Epoxidation of N‐Enoylsultams with Different Chiral Sultams as Auxiliaries.
Authors: Zhang Shu‐Jia , Chen Yong‐Kang , Li Hui‐Ming , Huang Wei‐Yang , Rogatchov Viktor , Metz Peter 
Published: August 2006

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, please click on HTML or PDF.
Fast Aqueous/Organic Hydrogenation of Arenes, Olefins and Carbonyl Compounds by Poly(N‐vinylpyrrolidone)‐Ru as Amphiphilic Microreactor System.
Authors: Lu Fang , Liu Jing , Xu Jie 
Published: August 2006

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, please click on HTML or PDF.
Microwave‐Assisted Reduction of Acetophenones Using Ni—Al Alloy in Water.
Authors: Miyazawa Akira , Tashiro Masashi , Prakash G. K. Surya , Olah George A. 
Published: August 2006

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, please click on HTML or PDF.
Rapid Conversion of Hindered Arylsulfonates to Alkyl Chlorides with Retention of Configuration.
Authors: Lepore Salvatore D. , Bhunia Anjan K. , Mondal Deboprosad , Cohn Pamela C. , Lefkowitz Craig 
Published: August 2006

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, please click on HTML or PDF.
A Novel Tunable Aromatic Bromination Method Using Alkyl Bromides and Sodium Hybride in DMSO.
Authors: Guo MaoJun , Varady Laszlo , Fokas Demosthenes , Baldino Carmen , Yu Libing 
Published: August 2006

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, please click on HTML or PDF.
Sodium Nitrite Catalyzed Oxybromination of Aromatic Compounds and Aryl Ketones with a Combination of Hydrobromic Acid and Molecular Oxygen under Mild Conditions.
Authors: Zhang Guofu , Liu Renhua , Xu Qing , Ma Lixin , Liang Xinmiao 
Published: August 2006

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, please click on HTML or PDF.
Stereospecific C—S Bond Formation from Chiral Tertiary Alcohols by Quinone‐Mediated Oxidation—Reduction Condensation Using Alkyl Diphenylphosphinites and Its Application to the Synthesis of a Chiral Tertiary Thiol.
Authors: Ikegai Kazuhiro , Pluempanupat Wanchai , Mukaiyama Teruaki 
Published: August 2006

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, please click on HTML or PDF.
Copper Fluorapatite Catalyzed N‐Arylation of Heterocycles with Bromo and Iodoarenes.
Authors: Kantam M. Lakshmi , Venkanna G. T. , Sridhar Ch. , Kumar K. B. Shiva 
Published: August 2006

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, please click on HTML or PDF.
Influence of the Catalytic Conditions on the Selectivity of the Pd‐Catalyzed Heck Arylation of Acrolein Derivatives.
Authors: Noel Sebastien , Djakovitch Laurent , Pinel Catherine 
Published: August 2006

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, please click on HTML or PDF.
Lanthanoid Complexes of the Monovacant Dawson Polyoxotungstate [α1‐P2W17O61] 10‐ as Selective and Recoverable Lewis Acid Catalysts.
Authors: Boglio Cecile , Lemiere Gilles , Hasenknopf Bernold , Thorimbert Serge , Lacote Emmanuel , Malacria Max 
Published: August 2006

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, please click on HTML or PDF.
Synthesis of 4‐Nitrophenyl Sulfones and Application in the Modified Julia Olefination.
Authors: Mirk Daniela , Grassot Jean‐Marie , Zhu Jieping 
Published: August 2006

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, please click on HTML or PDF.
Organic Solvent Nanofiltration in Asymmetric Hydrogenation: Enhancement of Enantioselectivity and Catalyst Stability by Ionic Liquids.
Authors: Wong Hau‐To , See‐Toh Yoong Hsiang , Ferreira Frederico Castelo , Crook Robert , Livingston Andrew G. 
Published: August 2006

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, please click on HTML or PDF.
Catalytic Addition of Secondary Amines to Carbodiimides by a Half‐Sandwich Yttrium Complex: An Efficient Route to N,N′,N′′,N′′‐Tetrasubstituted Guanidines.
Authors: Zhang Wen‐Xiong , Nishiura Masayoshi , Hou Zhaomin 
Published: August 2006

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, please click on HTML or PDF.