bluuebunny/crossref_metadata_2025_split huggingface dataset:
9.3 KDa components of the injected venom of Conus purpurascens define a new five‐disulfide conotoxin framework
Authors: Möller Carolina , Marí Frank 
Published: June 2010

AbstractThe 83‐residue conopeptide (p21a) and its corresponding nonhydroxylated analog were isolated from the injected venom ofConus purpurascens. The complete conopeptide sequences were derived from Edman degradation sequencing of fragments from tryptic, chymotryptic and cyanogen bromide digestions. p21a has a unique, 10‐cystine/5‐disulfide 7‐loop framework with extended 10‐residue N‐terminus and a 5‐residue C‐terminus tails, respectively. p21a has a 48% sequence homology with a recently described 13‐cystine conopeptide, con‐ikot‐ikot, isolated from the dissected venom of the fish‐hunting snailConus striatus. However, unlike con‐ikot‐ikot, p21a does not form a dimer of dimers. MALDI‐TOF mass spectrometry suggests that p21a may form a noncovalent dimer. p21a is an unusually large conotoxin and in so far is the largest isolated from injected venom. p21a provides evidence that theConusvenom arsenal includes larger molecules that are directly injected into the prey. Therefore, cone snails can utilize toxins that are comparable in size to the ones commonly found in other venomous animals. © 2010 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 96: 158–165, 2011.
Guidance on Safety/Health for Process Intensification Including MS Design. Part IV: Case Studies
Authors: Klais O. , Albrecht J. , Carson D. , Kraut M. , Lö P. , Minnich C. , Olschewski F. , Reimers C. , Simoncelli A. , Uerdingen M. 
Published: June 2010

AbstractThe new technology of process intensification by multiscale equipment can significantly contribute to the achievement of a safer design by switching from batch/semi‐batch to continuous operation combined with a reduction of the inventory of hazardous substances in critical stages. On the other hand, the shift to higher space‐time‐yields and temperatures comprises new risks (see Parts I and II). A tool was developed for preliminary risk assessment to cover characteristic features of micro‐designed equipment, called HAZOP‐LIKE study (see Part III). The generic case studies were applied to two demonstration projects within the IMPULSE project: sulfur dioxide oxidation and the alkylation reaction for the production of ionic liquids. The generic templates proved to be applicable and support comprehensive risk analysis studies on processes with hidden deviations not obviously following traditional HAZOP studies.
Effects of Soft Particle Deformability and Particle/Pore Size Ratio on the Blocking Mechanism in Dead‐End Microfiltration
Authors: Tung K. L. , Hu C. C. , Chuang C. J. , Hwang K. J. , Wu T. Y. 
Published: June 2010

AbstractMicrofiltrations of Saccharomyces cerevisiae yeast particles of various deformabilities were conducted to examine the blocking mechanism due to particle deposition during the initial stage of the microfiltration process. The S. cerevisiae particles were treated with glutaraldehyde to form particles of various deformabilities. To compare differences in the blocking mechanisms among the different particles during microfiltration, a blocking model was adopted to estimate the filtrate flux, which accounts for initial blocking due to pore obstruction and subsequent blocking due to the growth of a cake over these initially blocked regions. The surface morphology of the cake layer on the membrane surface and the blockage by particles in membrane pores was examined by scanning electron microscopy (SEM). Analysis of the blocking mechanism of particles of varying deformability during microfiltration based on the blocking model indicated that softer particles resulted in more severe pore blocking problems and greater flux decline. A comparison of the theoretical results with experimental observations by SEM showed good qualitative agreement.
Two‐Step Thermal Spin Transition and LIESST Relaxation of the Polymeric Spin‐Crossover Compounds Fe(X‐py)2[Ag(CN)2]2 (X=H, 3‐methyl, 4‐methyl, 3,4‐dimethyl, 3‐Cl)
Authors: Rodríguez‐Velamazán J. Alberto , Carbonera Chiara , Castro Miguel , Palacios Elías , Kitazawa Takafumi , Létard Jean‐François , Burriel Ramón 
Published: June 2010

AbstractIn the series of polymeric spin‐crossover compounds Fe(X‐py)2[Ag(CN)2)]2 (py=pyridine, X=H, 3‐Cl, 3‐methyl, 4‐methyl, 3,4‐dimethyl), magnetic and calorimetric measurements have revealed that the conversion from the high‐spin (HS) to the low‐spin (LS) state occurs by two‐step transitions for three out of five members of the family (X=H, 4‐methyl, and X=3,4‐dimethyl). The two other compounds (X=3‐Cl and 3‐methyl) show respectively an incomplete spin transition and no transition at all, the latter remaining in the HS state in the whole temperature range. The spin‐crossover behaviour of the compound undergoing two‐step transitions is well described by a thermodynamic model that considers both steps. Calculations with this model show low cooperativity in this type of systems. Reflectivity and photomagnetic experiments reveal that all of the compounds except that with X=3‐methyl undergo light‐induced excited spin state trapping (LIESST) at low temperatures. Isothermal HS‐to‐LS relaxation curves at different temperatures support the low‐cooperativity character by following an exponential decay law, although in the thermally activated regime and for aX=H and X=3,4‐dimethyl the behaviour is well described by a double exponential function in accordance with the two‐step thermal spin transition. The thermodynamic parameters determined from this isothermal analysis were used for simulation of thermal relaxation curves, which nicely reproduce the experimental data.
Triptycene‐Derived Calix[6]arenes: Synthesis, Structures, and Their Complexation with Fullerenes C60 and C70
Authors: Tian Xiao‐Hong , Chen Chuan‐Feng 
Published: June 2010

AbstractTwo pairs of novel triptycene‐derived calix[6]arenes 4 a,b and 5 a,b have been efficiently synthesized through both one‐pot and two‐step fragment‐coupling strategies starting from 2,7‐bis(hydroxymethyl)‐1,8‐dimethoxytriptycene 1. Subsequent demethylation of 4 a,b and 5 a,b with BBr3 in dry dichloromethane gave the macrocyclic compounds 6 a,b and 7 a,b. Treatment of either 4 a or 6 a with AlCl3 resulted in the same debutylated product 8, while 9 was similarly obtained from either 5 a or 7 a. Structural studies revealed that all of the macrocycles have well‐defined structures with fixed conformations both in solution and in the solid state owing to the introduction of the triptycene moiety with a rigid three‐dimensional (3D) structure, making them very different from their classical calix[6]arene counterparts. As a consequence, it was found that all of these the triptycene‐derived calix[6]arenes could encapsulate small neutral molecules in their cavities in the solid state. Moreover, it was also found that the macrocycles 4 b and 5 b showed highly efficient complexation abilities toward fullerenes C60 and C70, forming 1:1 complexes with association constants ranging from (5.22±0.20)×104 to (8.68±0.30)×104 M−1.
2‐Hydroxyazobenzenes to Tailor pH Pulses and Oscillations with Light
Authors: Emond Matthieu , Le Saux Thomas , Maurin Sylvie , Baudin Jean‐Bernard , Plasson Raphael , Jullien Ludovic 
Published: June 2010

AbstractThis paper evaluates the 2‐hydroxyazobenzene platform for tailoring proton concentration pulses and oscillations with monochromatic light. The easily prepared 2‐hydroxyazobenzenes exhibit large absorptions in the near‐UV range. Photoisomerization was investigated by UV/Vis absorption, 1H NMR spectroscopy, and steady‐state fluorescence emission. In the whole investigated series, the trans stereoisomer of the 2‐hydroxyazobenzene motif provides the corresponding cis derivative with an action cross section in the 103 M−1 cm−1 range. At the same time, photoisomerization is accompanied by a significant pK drop of the phenol group. According to the phenyl‐substituent pattern, cis‐to‐trans thermal back‐isomerization can be tuned in the 10 ms–100 s range. Up to 2 units of reversible pH drops or pH oscillations on the 10 s timescale have been obtained by appropriately tailoring single‐wavelength illumination of 2‐hydroxyazobenzene solutions.
Synthesis of Functionalized Indoles with a Trifluoromethyl‐Substituted Stereogenic Tertiary Carbon Atom Through an Enantioselective Friedel–Crafts Alkylation with β‐Trifluoromethyl‐α,β‐enones
Authors: Blay Gonzalo , Fernández Isabel , Muñoz M. Carmen , Pedro José R. , Vila Carlos 
Published: June 2010

AbstractChiral complexes of BINOL‐based ligands with zirconium tert‐butoxide catalyze the Friedel–Crafts alkylation reaction of indoles with β‐trifluoromethyl‐α,β‐unsaturated ketones to give functionalized indoles with an asymmetric tertiary carbon center attached to a trifluoromethyl group. The reaction can be applied to a large number of substituted α‐trifluoromethyl enones and substituted indoles. The expected products were obtained with good yields and ees of up to 99 %.
Self‐Sorted Assembly in a Mixture of Donor and Acceptor Chromophores
Authors: Molla Mijanur Rahaman , Das Anindita , Ghosh Suhrit 
Published: June 2010

AbstractA simple and novel supramolecular approach for orthogonal self‐assembly of donor and acceptor chromophores has been demonstrated. Suitably designed 1,5‐dialkoxynaphthalene (DAN) and naphthalene tetracarboxylic acid diimide (NDI) derivatives were used as the donor and acceptor systems, respectively. The molecular design for self‐sorting relies upon the precise control over the placement of the self‐complementary hydrogen‐bonding units (amide functionality) with respect to the individual chromophore. By design, the distances between the two amide groups in the donor and acceptor chromophores are not identical, and consequently the effect of the hydrogen‐bonding interaction cannot be maximised in the case of alternate donor–acceptor‐type π‐stacking. Thus a relatively weak charge‐transfer interaction is expected to be sacrificed, and segregated assembly among the individual chromophores should be enforced by virtue of the much stronger effects of hydrogen bonding and π–π stacking. Detailed spectroscopic studies were carried out to probe the mode of self‐assembly in various derivatives of the DAN–NDI donor–acceptor pairs to establish the utility of the molecular design as a generalised one for orthogonal self‐assembly.
A Computational Study of Rhodium Pincer Complexes with Classical and Nonclassical Hydride Centres as Catalysts for the Hydroamination of Ethylene with Ammonia
Authors: Uhe Andreas , Hölscher Markus , Leitner Walter 
Published: June 2010

AbstractThe catalytic hydroamination of ethylene with ammonia was investigated by means of density functional theory (DFT) calculations. An initial computational screening of key reaction steps (CN bond formation, NH bond cleavage), which are assumed to be part of a catalytic cycle, was carried out for complexes with the [M(L)]‐complex fragment (M=Rh, Ir; L=NCN, PCP; NCN=2,5‐bis(dimethylaminomethyl)benzene, PCP=2,5‐bis‐ (dimethylphosphanylmethyl)benzene). Based on the evaluation of activation barriers, this screening showed the rhodium compound with the NCN ligand to be the most promising catalyst system. A detailed investigation was carried out starting with the hypothetical catalyst precursor [Rh(NCN)(H)2(H2)] (1). A variety of activation pathways to yield the catalytically active species [Rh(NCN)(H)(NH2)] (5), as well as [Rh(NCN)(C2H5)(NH2)] (17), were identified. With 5 and 17 several closed catalytic cycles could be calculated. One of the calculated cycles is favoured kinetically and bond‐forming events have activation barriers low enough to be put into practice. The calculations also show that for experimental realisation the synthesis of 1 is not necessary, as the synthesis of 17 would establish an active catalyst directly without the need for activation. Oligomerisation of ethylene would be possible in principle and would be expected as a competitive side reaction. Accordingly not only ethylamine would be observed in an experimental system, as amines with longer carbon chains also can be formed.
Fabrication of a Biocompatible and Conductive Platform Based on a Single‐Stranded DNA/Graphene Nanocomposite for Direct Electrochemistry and Electrocatalysis
Authors: Zhang Qian , Qiao Yun , Hao Fei , Zhang Ling , Wu Shuyao , Li Ying , Li Jinghong , Song Xi‐Ming 
Published: June 2010

AbstractA novel electrochemical platform was designed by combining the biocompatibility of single‐stranded DNA (ss‐DNA) and the excellent conductivity of graphene (GP). This nanocomposite (denoted as ss‐DNA/GP) was first used as an electrode material for the immobilization and biosensing of redox enzymes. On the basis of electrostatic interactions, horseradish peroxidase (HRP) self‐assembled with ss‐DNA/GP on the surface of a glassy carbon (GC) electrode to form an HRP/ss‐DNA/GP/GC electrode. UV/Vis and FTIR spectra were used to monitor the assembly process and indicated that the immobilized HRP on the ss‐DNA/GP matrix retained its native structure well. A pair of stable and well‐defined redox peaks of HRP with a formal potential of about −0.26 V (vs. Ag/AgCl) in a pH 7.0 phosphate buffer solution were obtained at the HRP/ss‐DNA/GP/GC electrode; this demonstrates direct electron transfer between the immobilized HRP and the electrode. In addition, the modified electrode showed good electrocatalytic performance towards H2O2 with high sensitivity, wide linear range, and good stability. Accordingly, the ss‐DNA/GP nanocomposite provides a novel and efficient platform for the immobilized redox enzyme to realize direct electrochemistry and has a promising application in the fabrication of third‐generation electrochemical biosensors.
Reactions of Alkynes with [RuCl(cyclopentadienyl)] Complexes: The Important First Steps
Authors: Dutta Barnali , F. E. Curchod Basile , Campomanes Pablo , Solari Euro , Scopelliti Rosario , Rothlisberger Ursula , Severin Kay 
Published: June 2010

AbstractCyclopentadienyl–ruthenium half‐sandwich complexes with η2‐bound alkyne ligands have been suggested as catalytic intermediates in the early stages of Ru‐catalyzed reactions with alkynes. We show that electronically unsaturated complexes of the formula [RuCl(Cp^)(η2‐RC≡CR′)] can be stabilized and crystallized by using the sterically demanding cyclopentadienyl ligand Cp^ (Cp^=η5‐1‐methoxy‐2,4‐tert‐butyl‐3‐neopentyl‐cyclopentadienyl). Furthermore we demonstrate that [RuCl2(Cp^)]2 is an active and regioselective catalyst for the [2+2+2] cyclotrimerization of alkynes. The first elementary steps of the reaction of mono(η2‐alkyne) complexes containing {RuCl(Cp*)} (Cp*=η5‐C5Me5) and {RuCl(Cp^)} fragments with alkynes were investigated by DFT calculations at the M06/6‐31G* level in combination with a continuum solvent model. Theoretical results are able to rationalize and complement the experimental findings. The presence of the sterically demanding Cp^ ligand increases the activation energy required for the formation of the corresponding di(η2‐alkyne) complexes, enhancing the initial regioselectivity, but avoiding the evolution of the system towards the expected cyclotrimerization product when bulky substituents are present. Theoretical results also show that the electronic structure and stability of a metallacyclic intermediate is strongly dependent on the nature of the substituents present in the alkyne.
ChemInform Abstract: Electrical Resistivity, Oxidation Resistivity and Hardness of Single Crystal Compounds in the Er—Rh—B System.
Authors: SHISHIDO T. , KUDOU K. , OKADA S. , YE J. , OKU M. , HORIUCHI H. , FUKUDA T. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Structure and Characterization of a Mixed Crystal Rb2SO4×Te(OH)6.
Authors: DAMMAK M. , KHEMAKHEM H. , MHIRI T. , KOLSI A. W. , DAOUD A. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Structural Chemistry, Magnetism and Thermodynamic Properties of Ln2Pd2In.
Authors: GIOVANNINI M. , MICHOR H. , BAUER E. , HILSCHER G. , ROGL P. , FERRO R. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: The Phase Diagram of the Eu—Sn System.
Authors: PALENZONA A. , MANFRINETTI P. , FORNASINI M. L. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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 Plastic KC8/LiMn2O4 Lithium‐Ion Battery.
Authors: SCONOCCHIA S. , TOSSICI R. , MARASSI R. , CROCE F. , SCROSATI B. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: The Corrosion Behavior of Iron and Chromium in Molten (Li0.62K0.38)2CO3.
Authors: BIEDENKOPF P. , SPIEGEL M. , GRABKE H. J. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Triniobium Polytungstophosphates. Syntheses, Structures, Clarification of Isomerism and Reactivity in the Presence of H2O2.
Authors: HARRUP M. K. , KIM G.‐S. , ZENG H. , JOHNSON R. P. , VANDERVEER D. , HILL C. L. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Novel Pentacyano Complexes of Tri‐ and Tetravalent Platinum.
Authors: MALIARIK M. , GLASER J. , TOTH I. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Magnetic and Electrochemical Investigations on Anions Derived from Oligoketones Containing Fluorenone and Benzophenone Units. An Approach to the Design of Stable Multiradical Organic Materials.
Authors: BEHRENDT A. , SCRETTAS C. G. , BETHELL D. , SCHIEMANN O. , STEELE B. R. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Nitrogen‐Containing Compounds from the Moss Fontinalis squamosa.
Authors: SALM R. F. , ZINSMEISTER H. D. , EICHER T. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: New and Improved Catalysts for Transition Metal Catalyzed Radical Reactions.
Authors: DE CAMPO F. , LASTECOUERES D. , VERLHAC J.‐B. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Regioselective Opening of Substituted (Cyclopropylmethyl)lithiums Derived from Cyclopropylmethyl Iodides.
Authors: CHARETTE A. B. , NAUD J. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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 Asymmetric Diels—Alder Reactions of α‐Thioacrylates for the Preparation of Norbornenone.
Authors: AGGARWAL V. K. , ANDERSON E. S. , JONES D. E. , OBIEREY K. B. , GILES R. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Enantioselective Synthesis and Use in Catalytic Asymmetric Addition of Diethylzinc to Benzaldehyde of New Chiral Cyclic Hydroxyamino Ferrocene and Chromium Complexes: Influence of the Complexation on the Enantioselectivity.
Authors: MALFAIT S. , PELINSKI L. , BROCARD J. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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: Tandem Mukaiyama Michael‐Aldol Reactions Catalyzed by Samarium Diiodide.
Authors: GIUSEPPONE N. , COURTAUX Y. , COLLIN J. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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 Cp2TiCl2—Me3Al (1:4) Reagent System: An Efficient Reagent for Generation of Allylic Titanocene Derivatives from Vinyl Halides, Vinyl Ethers and Carboxylic Esters.
Authors: HANZAWA Y. , KOWASE N. , MOMOSE S. , TAGUCHI T. 
Published: June 2010

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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.