Functionalized calix[4]pyrroles
Abstract
Materials Literature
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Copper(I) halide supramolecular networks linked by N-heterocyclic donor bridging ligands
Abstract
On the reorientation transition of ultra-thin Ni/Cu(001) films
The reorientation transition of the magnetization of ferromagnetic films is studied on a microscopic basis within a Heisenberg spin model. Using a modified mean field formulation it is possible to calculate properties of magnetic thin films with non-integer thicknesses. This is especially important for the reorientati…
Giant transverse magnetoresistance in an asymmetric system of three GaAs/AlGaAs quantum wells in a strong magnetic field at room temperature
The giant transverse magnetoresistance is observed in the case of photoinduced nonequilibrium carriers in an asymmetric undoped system of three GaAs/AlGaAs quantum wells at room temperature. In a magnetic field of 75 kOe, the resistance of nanostructure being studied increases by a factor of 1.85. The magnetoresistanc…
Fundamental Quantities and Units for Ionizing Radiation
Definitions of fundamental quantities, and their units, for ionizing radiation are given, which represent the recommendation of the International Commission on Radiation Units and Measurements (ICRU). © 2011 International Commission on Radiation Units and Measurements.
Quantitative Assessment of Surface-Enhanced Resonance Raman Scattering for the Analysis of Dyes on Colloidal Silver
Factors that affect quantitative analysis by surface-enhanced resonance Raman scattering (SERRS) have been investigated using azobenzotriazol and reactive dyes. Preaggregation of the silver colloid was the most effective method to obtain repeatable and reproducible scattering. Aggregation by poly(l-lysine) or spermine…
ChemInform Abstract: X‐Ray Diffraction Study of Polysaccharides
Abstract ChemInform 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” opt…
New Approach to the Investigation of Mechanisms and Apparent Activation Energies for the Reduction of Metal Oxides Using Constant Reaction Rate Temperature-Programmed Reduction
A new system has been developed for the study of both bulk and surface metal oxides by temperature programmed reduction (TPR) under both conventional linear heating and constant rate thermal analysis (CRTA) conditions. It is shown that constant rate temperature-programmed reduction (CR-TPR) is capable of producing hig…
Synthesis and Structure of New Layered Oxides, M II La 2 Ti 3 O 10 (M = Co, Cu, and Zn)
New layered perovskite compounds, M II [La 2 Ti 3 O 10 ] (M = Co, Cu, and Zn) were synthesized by the ion-exchange reaction of the parent Na 2 La 2 Ti 3 O 10 in molten salts. The crystal structure of the as-synthesized phases was determined by the Rietveld refinement for the powder X-ray diffraction patterns. The unit…
Degree of Acetylation of Chitin and Extent of Grafting PHB on Chitosan Determined by Solid State 15N NMR
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDegree of Acetylation of Chitin and Extent of Grafting PHB on Chitosan Determined by Solid State 15N NMRGa-er Yu, Frederick G. Morin, Geoffrey A. R. Nobes, and Robert H. MarchessaultView Author Information Pulp and Paper Research Ce…
Synthesis of Model PS(PI)5 and (PI)5PS(PI)5 Nonlinear Block Copolymers of Styrene (S) and Isoprene (I)
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Model PS(PI)5 and (PI)5PS(PI)5 Nonlinear Block Copolymers of Styrene (S) and Isoprene (I)Gabriel Velis and Nikos HadjichristidisView Author Information Department of Chemistry, University of Athens, Panepistimiopolis, Z…
Characterization of Silica-Supported Pd−Au Clusters by X-ray Absorption Spectroscopy
Silica-supported Pd−Au clusters were characterized by Pd K and Au L 3 extended X-ray absorption fine structure (EXAFS) spectroscopy and Au L 2,3 X-ray absorption near-edge structure (XANES) spectroscopy. Pd−Au/SiO 2 catalysts with Pd/Au atomic ratios of approximately 1:1 were prepared by coadsorption of [Pd(NH 3 ) 4 ]…
Synthesis and Characterization of Conjugated Polyazines and Polyazomethines Containing the Thienylene Moiety and Flexible Hydrocarbon Side Chains
Condensation reactions of mono- and didodecyl-substituted-2,5-diformylthiophene with hydrazine, p -diaminobenzene, 2,7-diaminofluorene, and 1,5-diaminonaphatalene give the corresponding polyazines (PAZs) and polyazomethines (PAMs), which have been characterized by thermal, structural, and optical analyses. The former…
Synthesis and Properties of Alternating Acceptor−Donor Copolymers of Squaric Acid with 1-Dodecyl- and 3-Dodecylpyrroles
Polycondensation between the acceptor−donor monomer combination of squaric acid with 1-dodecyl- and 3-dodecylpyrroles provided conjugated macromolecules having two types of isomeric repeating units, depending upon the reaction conditions employed. Under azeotropic distillation using the 1-butanol−benzene solvent mixtu…
Double-Twisted Helical Lamellar Crystals in a Synthetic Main-Chain Chiral Polyester Similar to Biological Polymers
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Double-Twisted Helical Lamellar Crystals in a Synthetic Main-Chain Chiral Polyester Similar to Biological PolymersChritopher Y. Li, Donghang Yan, Stephen Z. D. Ch…
An Efficient Catalyst for Asymmetric Epoxidation of Terminal Olefins
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Efficient Catalyst for Asymmetric Epoxidation of Terminal OlefinsJames P. Collman, Zhong Wang, Andrei Straumanis, Mélanie Quelquejeu, and Eric RoseView Author Information Department of Chemistry, Stanford University Stanford, California 94305-5080 Laboratoire de Syn…
Onset of magnetism in B2 transition metals aluminides
Ab initio calculation results for the electronic structure of disordered bcc Fe(x)Al(1-x) (0.40.5.
Structure and Properties of Novel Asymmetric Biphenyl Type Polyimides. Homo- and Copolymers and Blends
Asymmetric biphenyl type polyimides (PI) were prepared by thermal imidization of polyamic acids (PAA) derived from 2,3,3‘,4‘-biphenyltetracarboxylic dianhydride (a-BPDA) and p -phenylenediamine (PDA) or 4,4‘-oxydianiline (ODA). The dynamic mechanical properties of these PIs were compared with those of the isomeric PIs…
Phase Analysis of Thin Film Oxide Systems by AES and EELS
Auger electron spectroscopy (AES) and electron energy loss spectroscopy (EELS) in a reflection mode are compared as the methods for phase composition investigation of thin film oxide systems by ion profiling. As an example, the Al/Al2O3/Si and YBa2Cu3O7/CeO2/Al2O3 systems are considered. The adaptation of applied stat…
Hybrid Nanoparticles with Block Copolymer Shell Structures
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHybrid Nanoparticles with Block Copolymer Shell StructuresKeith J. Watson, Jin Zhu, SonBinh T. Nguyen, and Chad A. MirkinView Author Information Department of Chemistry, Northwestern University 2145 Sheridan Road, Evanston, Illinois 60208 Cite this: J. Am. Chem. Soc. 1…