Materials Literature
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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.
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…
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…
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…
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 =…
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…
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…
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, 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/…
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…
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.
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…
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…
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…
H. McNab, Contemp. Org. Synth., 1996, 3, 373 DOI: 10.1039/CO9960300373
Hydrogen sulfide, often present in crude oil tankers, can react with rust to form various sulfides including mackinawite (FeS), greigite (Fe 3 S 4 ), and pyrite (FeS 2 ). The tendency for these compounds to react with oxygen in air to form potentially explosive mixtures depends upon their morphology and the environmen…
The deoxygenation of the mixed-metal polyoxoanion [(C(4)H(9))(4)N](3)NbW(5)O(19) with benzoyl chloride in dichloromethane forms quantitatively the condensed polyoxanion [(C(4)H(9))(4)N](4)(NbW(5)O(18))(2)O, in which two polyoxoanion fragments are linked together by a Nb-O-Nb oxo bridge. The product is characterized by…
Using the Lindsey method the title compounds were prepared from the corresponding metallocenecarbaldehydes and pyrrole in 56% and 40% yield respectively.
The solidification of peritectic alloys is reviewed, including both nucleation and growth. The introduction defines various compositions associated with binary peritectic alloys, their ‘equilibrium’ solidification, multicomponent peritectic systems, and metastable phases in peritectic systems. Nucleation studies are r…
Tight-binding electronic band structures and Madelung potentials were calculated for La(2)NiO(4), La(3)Ni(2)O(7), and La(4)Ni(3)O(10) to examine why a metal-to-metal transition occurs in the nickelate Ln(4)Ni(3)O(10) (Ln = La, Nd, Pr). La(4)Ni(3)O(10) and La(3)Ni(2)O(7) are each found to have two hidden one-dimensiona…