bluuebunny/crossref_metadata_2025_split huggingface dataset:
PCP‐ and SCS‐Pincer Palladium Complexes Immobilized on Mesoporous Silica: Application in CC Bond Formation Reactions
Authors: Mehendale Nilesh C. , Sietsma Jelle R. A. , de Jong Krijn P. , van Walree Cornelis A. , Gebbink Robertus J. M. Klein , van Koten Gerard 
Published: November 2007

AbstractECE‐pincer palladium(II) complexes {ECE=[C6H3(CH2E)2‐2,6]−, E=PPh2 and SPh} tethered to a trialkoxysilane moiety through a carbamate linkage were immobilized on ordered mesoporous silicas SBA‐15 and MCM‐41 using a grafting process. The resulting hybrid materials were characterized by IR spectroscopy, solid‐state CP/MAS NMR (13C, 31P, and 29Si), and elemental analyses. These analyses showed the integrity of the pincer‐metal complexes on the supports, which highlights their stability under the applied immobilization conditions. An H‐bonding interaction between the carbamate carbonyl group of the complex and free silanol groups on the silica surface was also established. The hybrid materials were found to act as Lewis acid catalysts in the aldol reaction between methyl isocyanoacetate and benzaldehyde. SBA‐15 modified with the PCP‐pincer Pd complex was used in up to five runs without loss of activity. Control experiments showed the true heterogeneous nature of the catalyst in this reaction. Nitrogen physisorption data, XRD, and TEM/EDX analyses of the hybrid materials revealed that the mesoporous structure of these materials was retained during the immobilization process as well as during catalysis.
Continuous Flow Hydrogenation of a Pharmaceutical Intermediate, [4‐(3,4‐Dichlorophenyl)‐3,4‐dihydro‐2H‐naphthalenyidene]methylamine, in Supercritical Carbon Dioxide
Authors: Clark Peter , Poliakoff Martyn , Wells Andy 
Published: November 2007

AbstractThe hydrogenation of complex pharmaceutical intermediate, rac‐sertraline imine has been optimized as a continuous flow process utilizing a palladium/calcium carbonate (Pd/CaCO3) catalyst and hydrogen in supercritical carbon dioxide (scCO2). Superior levels of selectivity were obtained in the flow system possibly attributable to the heat transfer properties of scCO2 which help to remove excess heat from the catalyst surface.
“Mixing rules” for estimating the hydraulic permeability of fiber mixtures
Authors: Mattern Kristin J. , Deen William M. 
Published: November 2007

AbstractWhile theoretical results for the hydraulic permeability of fibrous media are typically based on a single type of fiber in an ordered array, many synthetic or biological materials are composed of fibers which differ in size, charge, orientation, or other characteristics. It is desirable to be able to estimate the permeability of such a mixture from its composition and the properties of the individual fiber types. Toward that end, we compared four “mixing rules” proposed in the literature, each based on differing approximations of the hydrodynamic interactions between multiple fiber types. To provide data for charged fibers, the open‐circuit hydraulic permeabilities of periodic arrays of fibers with different surface charge densities and/or radii were computed using finite element methods. Based on these data for charged fibers, as well as published results for arrays of uncharged fibers of differing radii and/or orientation, we compared the four mixing rules for 64 cases. In some situations there were several‐fold differences among the predicted hydraulic permeabilities. Nonetheless, a volume‐weighted averaging of the resistivities of individual fiber types was found to be reasonably reliable, giving an overall root‐mean‐square error of 24%. This mixing rule was equally applicable to systems containing charged or neutral fibers. © 2007 American Institute of Chemical Engineers AIChE J, 2008
Analysis of the third national health and nutrition examination survey (NHANES III) using expert ratings of job categories
Authors: D'Souza Jennifer C. , Werner Robert A. , Keyserling W. Monroe , Gillespie Brenda , Rabourn Randall , Ulin Sheryl , Franzblau Alfred 
Published: November 2007

AbstractBackgroundFew epidemiologic studies have addressed the exposure–response relationships between work activities and symptomatic knee osteoarthritis (OA). This analysis used data from a national survey and ergonomists' ratings to address this issue.MethodsInterview and knee X‐ray data were obtained from the Third National Health and Nutrition Examination Survey. Occupational ratings were obtained using ergonomists. A weighted logistic regression was used.ResultsAmong men, a significant exposure–response relationship was found between symptomatic knee OA and kneeling. In both genders, there was a significant trend in heavy lifting and severe symptomatic knee OA. Approximately 20.7% of knee OA can be attributed to kneeling >14% of the workday among men.ConclusionsThe significant exposure–response relationships suggest that modest reductions in certain occupational activities can reduce the burden of knee OA. The study was limited by unvalidated expert ratings. Research is needed to identify hazardous characteristics of work activities and to clarify exposure–response relationships. Am. J. Ind. Med. 51:37–46, 2008. © 2007 Wiley‐Liss, Inc.
Work tasks, chemical exposure and respiratory health in construction painting
Authors: Kaukiainen Ari , Martikainen Rami , Riala Riitta , Reijula Kari , Tammilehto Lauri 
Published: November 2007

AbstractBackgroundThere is insufficient knowledge about the role of house painting tasks and chemical exposure in the respiratory health of construction workers.MethodsA cross‐sectional questionnaire survey was conducted of 1,000 Finnish male construction painters and 1,000 carpenters (response rates 60.6% and 60.4%, respectively). Multivariate logistic regression models were adjusted for age, smoking, and atopy.ResultsOutdoor painting, more than indoor painting, was associated with asthma‐like respiratory symptoms [odds ratios (OR) 2.7–6.5], rhinitis symptoms [OR 2.4, 95% confidence interval (CI) 1.1–5.2], asthma (OR 4.7, 95% CI: 1.4–16.1), and chronic bronchitis (OR 2.9, 95% CI: 1.0–8.4) when compared to carpentry work. Risk factors for respiratory symptoms and chronic bronchitis were the use of epoxy/urethane paints, putties, and plasters and the use of glues or traditional paints. Water‐based paints were not a common cause of symptoms.ConclusionsSpecial attention should be paid to work methods and personal protection, not only in outdoor painting, but also in all filling, plastering, and sanding tasks. The shift from epoxy/urethane and other solvent‐based paints to water‐based products should be further encouraged. Am. J. Ind. Med. 51:1–8, 2008. © 2007 Wiley‐Liss, Inc.
The clinical phenotype of mosaicism for genome‐wide paternal uniparental disomy: Two new reports
Authors: Wilson Meredith , Peters Gregory , Bennetts Bruce , McGillivray George , Wu Zan He , Poon Christopher , Algar Elizabeth 
Published: November 2007

AbstractRecently, mosaicism for genome‐wide paternal uniparental disomy (patUPD), attributed to androgenetic/biparental mosaicism, has been shown to underlie placental mesenchymal dysplasia (PMD), a distinctive cystic placental phenotype. Manifestations of Beckwith–Wiedemann syndrome (BWS) have been observed in approximately one‐third of fetuses or liveborn infants from pregnancies complicated by PMD. There are very few reports describing liveborn individuals with proven mosaicism for genome‐wide patUPD in somatic tissues. We report two further children with complex phenotypes including some findings of BWS, congenital hyperinsulinemic hypoglycemia, prolonged feeding difficulty and failure to thrive in infancy. The first developed short stature, bilateral pheochromocytomas and progressive arterial stenoses, and the second had congenital adrenal cysts, and later developed hepatoblastoma and patchy hyperpigmentation. Leukocyte DNA methylation studies of KCNQ1OT1/LIT1 and H19 loci (11p15.5) showed almost complete loss of maternal methylation (LOM) in patient 1 and partial LOM in patient 2. Microsatellite marker panels showed whole chromosome 11 patUPD. SNP array studies in both were consistent with mosaic genome‐wide patUPD in leukocytes, while fibroblast DNA in Patient 1 showed biparental inheritance. This report further illustrates the clinical consequences of mosaicism for genome‐wide patUPD, which results in complex and variable phenotypes. Studies for genome‐wide UPD should be considered in individuals with atypical UPD phenotypes. © 2007 Wiley‐Liss, Inc.
One‐pot synthesis of a polysaccharide‐based graft copolymer with an efficient redox pair (Fe2+/BrO3−)
Authors: Kumar Rajesh , Srivastava Arti , Behari Kunj 
Published: November 2007

AbstractA graft copolymer based on a polysaccharide (sodium salt of carboxymethylcellulose) and a vinyl monomer (acrylamide) has been synthesized in a nitrogen atmosphere, and its reaction conditions have been optimized for a better yield with ferrous sulfate and potassium bromate as a redox initiator. The effects of ferrous ion, bromate ion, hydrogen ion, sodium carboxymethylcellulose, and acrylamide along with the reaction time and temperature have been studied through the determination of the grafting parameters: the grafting ratio, add‐on, conversion, efficiency, homopolymer, and rate of grafting. The maximum yield has been found to occur when the acrylamide concentration is 8.0 × 10−2 mol/dm3, whereas the maximum conversion occurs at a minimum concentration of acrylamide, that is, at 3.0 × 10−2 mol/dm3. The grafting parameters have been found to increase with an increasing concentration of the redox initiator (Fe2+, from 2.0 × 10−3 to 10.0 × 10−3 mol/dm3; BrO, from 2.2 × 10−3 to 4.0 × 10−3 mol/dm3). The maximum efficiency occurs with a reaction time of 210 min. The rate of grafting has been found to be maximum up to 60 min; after that, it decreases rapidly. In this article, it is shown that the hydrogen ion leads to a very clear decrease in the grafting parameters as its concentration increases from 2.1 × 10−3 to 11.3 × 10−3 mol/dm3. Grafted gum and ungrafted gum have been characterized with Fourier transform infrared spectroscopy and thermogravimetric analysis. A probable mechanism has been suggested for graft copolymerization. It has been observed that the graft copolymer is thermally more stable than the parent backbone. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Blends of poly(ethylene terephthalate)/polycarbonate by the use of lanthanum acetyl acetonate catalyst
Authors: Zahedi P. , Arefazar A. 
Published: November 2007

AbstractBlends of poly(ethylene terephthalate) (PET)/polycarbonate (PC) in the presence of lanthanum acetyl acetonate catalyst that causes reactive mixing of two polymers were prepared, and mechanical and morphological properties were studied. For comparison reasons, simple blends of those two polymers (in the absence of catalyst) were also prepared. Compatibility strongly depends on the degree of transesterification at the interface of PET/PC, which leads to decrease of PET crystallinity, and results reveal that at 40–50% of PC content in blends a fine microstructure is formed and impact strength reaches its maximum value. This phenomenon is attributed to the occurrence of transesterification reactions. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Hemicarbasucrose: Turning off the Exoanomeric Effect Induces Less Flexibility
Authors: López‐Méndez Blanca , Jia Cai , Zhang Yongmin , Zhang Li‐He , Sinaÿ Pierre , Jiménez‐Barbero Jesús , Sollogoub Matthieu 
Published: November 2007

AbstractHemicarbasucrose, a close congener of sucrose in which the endocyclic oxygen atom of the glucose moiety is replaced by a methylene group was synthesized for the first time. The conformational behaviour of hemicarbasucrose was studied by a combination of molecular mechanics and NMR spectroscopy (J and NOE data). It was shown that the carbadisaccharide populates two distinct conformational families in solution, the normal syn‐ψ conformation, which is the predominating conformation of the parent natural O‐glycoside, and the anti‐ψ conformation, which has not been detected for the O‐disaccharide. Interestingly, the hemicarbasucrose is less flexible than its natural congener.
Cationic Bis‐cyclometallated Iridium(III) Phenanthroline Complexes with Pendant Fluorenyl Substituents: Synthesis, Redox, Photophysical Properties and Light‐Emitting Cells
Authors: Zeng Xianshun , Tavasli Mustafa , Perepichka Igor F. , Batsanov Andrei S. , Bryce Martin R. , Chiang Chien‐Jung , Rothe Carsten , Monkman Andrew P. 
Published: November 2007

AbstractWe report the synthesis, characterisation, photophysical and electrochemical properties of a series of cationic cyclometallated IrIII complexes of general formula [Ir(ppy)2(phen)]PF6 (ppy=2‐phenylpyridine, phen=a substituted phenanthroline). A feature of these complexes is that the phen ligands are substituted with one or two 9,9‐dihexylfluorenyl substituents to provide extended π conjugation, for example, the 3‐[2‐(9,9‐dihexylfluorenyl)]phenanthroline and 3,8‐bis[2‐(9,9‐dihexylfluorenyl)]phenanthroline ligands afford complexes 6 and 9, respectively. A single‐crystal X‐ray diffraction study of a related complex 18 containing the 3,8‐bis(4‐iodophenyl)phenanthroline ligand, revealed an octahedral coordination of the Ir atom, in which the metallated C atoms of the ppy ligands occupy cis positions. The complexes 6 and 9 displayed reversible oxidation waves in cyclic voltammetric studies (${E{{{\rm ox}\hfill \atop 1/2\hfill}}}$=+1.18 and +1.20 V, respectively, versus Ag/Ag+ in CH2Cl2) assigned to the metal‐centred IrIII/IrIV couple. The complexes exhibit strong absorption in the UV region in solution spectra, due to spin‐allowed ligand‐centred (LC) 1π–π* transitions; moderately intense bands occur at approximately 360–390 nm which are red‐shifted with increased ligand length. The photoluminescence spectra of all the complexes were characterised by a broad band at λmax≈595 nm assigned to a combination of 3MLCT and 3π→π* states. The long emission lifetimes (in the microsecond time‐scale) are indicative of phosphorescence: the increased ligand conjugation length in complexes 9 and 17 leads to increased lifetimes for the complexes (τ=2.56 and 2.57 μs in MeCN, respectively) compared to monofluorenyl analogues 6 and 15 (τ=1.43 and 1.39 μs, respectively). DFT calculations of the geometries and electronic structures of complexes 6′, 9′ (for both singlet ground state (S0) and triplet first excited (T1) states) and 18 have been performed. In the singlet ground state (S0) HOMO orbitals in the complexes are spread between the Ir atom and benzene rings of the phenylpyridine ligand, whereas the LUMO is mainly located on the phenanthroline ligand. Analysis of orbital localisations for the first excited (T1) state have been performed and compared with spectroscopic data. Spin‐coated light‐emitting cells (LECs) have been fabricated with the device structures ITO/PEDOT:PSS/Ir complex/Al, or Ba capped with Al (ITO=indium tin oxide, PEDOT=poly(3,4‐ethylenedioxythiophene), PSS=poly(styrene) sulfonate). A maximum brightness efficiency of 9 cd A−1 has been attained at a bias of 9 V for 17 with a Ba/Al cathode. The devices operated in air with no reduction in efficiency after storage for one week in air.
Alkali‐Metal‐Mediated Manganation(II) of Functionalized Arenes and Applications of ortho‐Manganated Products in Pd‐Catalyzed Cross‐Coupling Reactions with Iodobenzene
Authors: Blair Victoria L. , Clegg William , Conway Ben , Hevia Eva , Kennedy Alan , Klett Jan , Mulvey Robert E. , Russo Luca 
Published: November 2007

AbstractExtending the recently introduced concept of “alkali‐metal‐mediated manganation” to functionalised arenes, the heteroleptic sodium manganate reagent [(tmeda)Na(tmp)(R)Mn(tmp)] (1; TMEDA=N,N,N′,N′‐tetramethylethylenediamine, TMP=2,2,6,6‐tetramethylpiperidide, R=CH2SiMe3) has been treated with anisole or N,N‐diisopropylbenzamide in a 1:1 stoichiometry in hexane. These reactions afforded the crystalline products [(tmeda)Na(tmp)(o‐C6H4OMe)Mn(tmp)] (2) and [(tmeda)Na(tmp){o‐{C(O)N(iPr)2C6H4}Mn(CH2SiMe3)] (3), respectively, as determined from X‐ray crystallographic studies. On the basis of these products, it can be surmised that reagent 1 has acted, at least partially and ultimately, as an alkyl base in the first reaction liberating the silane Me4Si, but as an amido base in the second reaction liberating the amine TMPH. Both of these paramagnetic products 2 and 3 have contacted ion‐pair structures, the key features of which are six‐atom, five‐element (NaNMnCCO) and seven‐atom, five‐element (NaNMnCCCO) rings, respectively. Manganates 2 and 3 were successfully cross‐coupled with iodobenzene under [PdCl2(dppf)] (dppf=1,1′‐bis(diphenylphosphino)ferrocene) catalysis to generate unsymmetrical biaryl compounds in yields of 98.0 and 66.2 %, respectively. Emphasizing the importance of alkali‐metal mediation in these manganation reactions, the bisalkyl Mn reagent on its own fails to metalate the said benzamide, but instead produces the monomeric, donor–acceptor complex [Mn(R)2{(iPr)2NC(Ph)(O)}2] (5), which has also been crystallographically characterised. During one attempt to repeat the synthesis of 2, the butoxide‐contaminated complex [{(tmeda)Na(R)(OBu)(o‐C6H4OMe)Mn}2] (6) was obtained. In contrast to 2 and 3, due to reduced steric constraints, this complex adopts a dimeric arrangement in the crystal, the centrepiece of which is a twelve atom (NaOCCMnC)2 ring.
Binding of Pertechnetate to Uranyl(VI) in Aqueous Solution. A Density Functional Theory Molecular Dynamics Study.
Authors: Buehl Michael , Golubnychiy Volodymyr 
Published: November 2007

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.
All‐Electron First Principles Calculations of the Ground and Some Low‐Lying Excited States of BaI.
Authors: Miliordos Evangelos , Papakondylis Aristotle , Tsekouras Athanasios A. , Mavridis Aristides 
Published: November 2007

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.
Cyclic Se6 and Helical 1∞[Sex] as Neutral Ligands in the New Compounds PdBr2Se6 and PdCl2Se8.
Authors: Deiseroth Hans‐Joerg , Reiner Christof , Schlosser Marc , Wang Xiaowen , Ajaz Humayun , Kienle Lorenz 
Published: November 2007

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.
Structural Phase Transitions and Crystals Chemistry of the Series Ba2LnB′O6 (Ln = Lanthanide and B′ = Nb5+ or Sb5+).
Authors: Saines Paul J. , Kennedy Brendan J. , Elcombe Margaret M. 
Published: November 2007

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, Vibrational Analysis, and Insights into Host—Guest Interactions in As‐Synthesized Pure Silica ITQ‐12 Zeolite by Periodic B3LYP Calculations.
Authors: Zicovich‐Wilson Claudio Marcelo , San‐Roman Maria Luisa , Camblor Miguel Angel , Pascale Fabien , Durand‐Niconoff Jose Sergio 
Published: November 2007

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.
FT‐IR and Raman Spectroscopic Studies on B2O3—PbO—Ag2O Glasses Doped with Manganese Ions.
Authors: Lucacel Raluca Ciceo , Marcus Carmen , Timar V. , Ardelean I. 
Published: November 2007

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.
SnTe Nanocrystals: A New Example of Narrow‐Gap Semiconductor Quantum Dots.
Authors: Kovalenko Maksym V. , Heiss Wolfgang , Shevchenko Elena V. , Lee Jong‐Soo , Schwinghammer Harald , Alivisatos A. Paul , Talapin Dmitri V. 
Published: November 2007

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.
Metal—Semiconductor Hybrid Nanostructure Ag—Zn0.9Co0.1O: Synthesis and Room‐Temperature Ferromagnetism.
Authors: Qiu Xiaoqing , Li Liping , Tang Changlin , Li Guangshe 
Published: November 2007

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.
Magnetic Properties of DyCo5 and TbCo5 Intermetallics from the Electronic Structure Calculations.
Authors: Miletic G. I. , Blazina Z. 
Published: November 2007

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.
Thermodynamic Studies on SrFe12O19(s), SrFe2O4(s), Sr2Fe2O5(s) and Sr3Fe2O6(s).
Authors: Rakshit S. K. , Parida S. C. , Dash S. , Singh Z. , Sen B. K. , Venugopal V. 
Published: November 2007

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.
Enthalpies of Formation of Rare Earth Orthovanadates, REVO4.
Authors: Dorogova M. , Navrotsky A. , Boatner L. A. 
Published: November 2007

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.
Germanates of 1D Chains, 2D Layers, and 3D Frameworks Built from Ge—O Clusters by Using Metal‐Complex Templates: Host—Guest Symmetry and Chirality Transfer.
Authors: Liu Guang‐Zhen , Zhang Hong‐Xia , Lin Zhi‐En , Zheng Shou‐Tian , Zhang Jie , Zhao Jing‐Tai , Wang Guo‐Ming , Yang Guo‐Yu 
Published: November 2007

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.
Local Structure and Influence of Bonding on the Phase‐Change Behavior of the Chalcogenide Compounds K1‐xRbxSb5S8.
Authors: Kanatzidis M. G. , et al. et al. 
Published: November 2007

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 Titanium Disilicide Derived Semiconducting Catalyst for Water Splitting under Solar Radiation—Reversible Storage of Oxygen and Hydrogen.
Authors: Ritterskamp Peter , Kuklya Andriy , Wuestkamp Marc‐Andre , Kerpen Klaus , Weidenthaler Claudia , Demuth Martin 
Published: November 2007

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.
Environmentally Friendly Growth of Layered K4Nb6O17 Crystals from a KCl Flux.
Authors: Teshima Katsuya , Niina Yuki , Yubuta Kunio , Suzuki Takaomi , Ishizawa Nobuo , Shishido Toetsu , Oishi Shuji 
Published: November 2007

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.