The synthesis of quinones
P. T. Gallagher, Contemp. Org. Synth., 1996, 3, 433 DOI: 10.1039/CO9960300433
Materials Literature
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Paramagnetic Silica Particles: Synthesis and Grafting of a Silane Coupling Agent Containing Nickel Ions onto Colloidal Silica Particles
A method is presented for the preparation of stable model dispersions of paramagnetic silica particles. A specially designed silane coupling agent containing Ni 2+ ions is grafted onto silica particles which are either commercially obtained or prepared by the Stöber synthesis. A wet process is described which avoids a…
Extracellular Production of Silver Nanoparticles by Using Three Common Species of Dermatophytes: Trichophyton rubrum, Trichophyton mentagrophytes and Microsporum canis
BACKGROUND: To develop a new green approach for biosynthesis of silver nanoparticles, myconanotechnology has been represented as a novel field of study in nanotechnology. In this study, we have reported the extracellular synthesis of highly stable silver nanoparticles using three species of dermatophytes: Trichophyton…
Polymorphism, twinning and morphology of crystals of 2,4,6-trinitrotoluene grown from solution
Crystals of 2,4,6-trinitrotoluene (TNT) have been grown from a wide range of organic solvents under various conditions. The structural nature and morphology of these crystals were systematically characterised using a number of techniques. The crystals were found to exist in two basic forms having monoclinic and orthor…
Kinetics of Aluminothermic Reduction of MnO2 and Fe2O3: A Thermoanalytical Investigation.
This paper presents the main kinetic parameters for aluminothermic reduction of MnO2 and Fe2O3. Aluminothermic reduction which in fact is a redox reaction requires an initial input of heat which is obtained through external reaction and/or oxidation of aluminium. In a system where oxidation as well as reduction take p…
Desolvating cubes and linking prisms: routes to high-nuclearity cobalt complexes
Four new Co complexes are reported which illustrate routes to high nuclearity species; these include a dodecanuclear ‘chain of cubes’ and a tridecanuclear species which features a tetranucleating phthalate ligand.
NMR and x-ray studies of collagen model peptides
The main structural component in collagen is the triple helix which is generally composed of the amino acid sequence repeat (X-Y-Gly)n with proline and hydroxyproline often present at positions X and Y. Non-globular, fibrillar proteins like most collagens are difficult to work with from a structural perspective. An al…
Stereochemical Control in Metalloporphyrin Chemistry: Synthesis and Characterization of cis- and trans-Sn(porphyrin)Ph2
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStereochemical Control in Metalloporphyrin Chemistry: Synthesis and Characterization of cis- and trans-Sn(porphyrin)Ph2Denisha Y. Dawson, Joan C. Sangalang, and John ArnoldView Author Information Department of Chemistry, University of California Berkeley, California 94…
Magnesium Oxychloride Cement Concrete with Recycled Tire Rubber
Either portland cement or magnesium oxychloride cement was used as binders for concretes that incorporated fine rubber aggregate, ranging from 0 to 25 percent by volume. The concretes were tested for their compressive and split tensile strengths to determine whether the use of a magnesium oxychloride cement along with…
The crystal structure of the ternary alloy c-Al68Pd20Ru12
Abstract The crystal structure of cubic Al 68 Pd 20 Ru 12 was investigated by means of single crystal X-ray structure analysis: space group P 23 (No. 195), a = 15.540(2) Å, V = 3753(1) Å 3 , Pearson symbol cP 296–46.85. The chemical composition was determined by microprobe analysis: Al 68 Pd 20 Ru 12 , M r = 6316, Z =…
Solid Layer Melt Crystallization
Melt crystallization processes are predominantly used to separate and purify substances or to concentrate compounds. The thermal unit operation is based on a different equilibrium composition of a substance in a different stage of aggregation. Background information about the theory of melt crystallization can be foun…
Aromatic Polymers Obtained by Precipitation Polycondensation. 3. Thermal Behavior and Microstructure of PEKEKK Particles
In the second part of this series the influence of monomer concentration on the chemical structure and the shape and size of poly(aryl ether ketone ether ketone ketone) (PEKEKK) particles was reported. The present study of the thermal behavior and microstructure of aromatic polyketone samples in the form of particles…
The influence of chemical structure on the dielectric behavior of polypropylene
An initial study has been made of radiation-induced oxidation of polypropylene (PP) in both its additive-free form and one containing discrete amounts of stabilizer (HALS). Samples of PP were irradiated in a /sup 60/Co /spl gamma/ source to various doses. This took place in either room air to give in-source oxidation…
Two new test methods for assessing environmental stress cracking of amorphous thermoplastics
Two new test methods, monotonic creep and micro-hardness, are used to study the environmental stress crack (ESC) resistance of polymethyl methacrylate (PMMA) and unplasticised polyvinyl chloride (UPVC). Monotonic creep is shown to discriminate, to a high resolution and in the short term, the ESC resistance of polymer/…
Synthesis, structure and characterization of mixed cyclopentadienyl–dithiolene metal complexes, [Co(η-C 5 H 5 ) 2 ][Ni(C 3 S 5 ) 2 ] 3 ·2MeCN and [Ni(η-C 5 H 5 )(C 3 S 5 )]
Two new compounds [Co(η-C5H5)2][Ni(C3S5)2]3·2MeCN and [Ni(η-C5H5)(C3S5)], both obtained by combination of the nickel complex anion [Ni(C3S5)2]–(C3S5= 4,5-disulfanyl-1,3-dithiole-2-thionate) and the metallocenium cation [M(η-C5H5)2]+(M = Co or Ni), respectively, have been prepared and characterized crystallographically…
Crystal morphology of ibuprofen predicted from single-crystal pulsed neutron diffraction data
Low-temperature single-crystal pulsed neutron diffraction is used to determine accurate positions and thermal parameters for all 33 atoms of the ibuprofen molecule, and the data used to predict the crystal morphology.
Stabilization of Intrazeolitic Cadmium Telluride Nanoclusters by Ion Exchange
Cadmium telluride nanoclusters were prepared by vapor-phase deposition of elemental tellurium in Na + −zeolite A, followed by partial exchange of the zeolite with aqueous Cd(NO 3 ) 2, and reduction with hydrogen at 450 °C. The stability of the nanoclusters in environments that normally cause rapid Ostwald ripening or…
Melt viscosity of calcium‐carbonate‐filled low density polyethylene: Influence of matrix‐filler and particle‐particle interactions
Abstract The melt viscosity of filled polymers depends on the filler particle packing. It is shown that the maximum particle packing for a low density polyethylene, filled with calcium carbonate, depends strongly on the filler surface treatment. This packing can be evaluated from melt viscosity measurements using the…
Kinetics of the p-Aminodiphenylamine Radical in Organic Solution: An Electrochemical and Electron Spin Resonance Study
In studying the reaction mechanism of anodic aniline oxidation the dimer p -aminodiphenylamine (ADPA) was found to be the main intermediate product in acidic solution. It is oxidized in both the free amine and the protonated form. The cyclic voltammograms have been simulated by taking into account an electrochemical r…
Synthetic applications of flash vacuum pyrolysis
H. McNab, Contemp. Org. Synth., 1996, 3, 373 DOI: 10.1039/CO9960300373