Materials Literature
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It was recently suggested that the electron affinity may pose an additional upper limit on the charge of a single particle in a plasma, in addition to the electron field emission limit. Here we will, however, show that these two limits both rely on the same physical process and that the limit is only relevant for smal…
Two independent isolates of Saccharomyces cerevisiae lacking hexokinase activity (EC 2.7.1.1) are described. Both mutant strains grow on glucose but are unable to grow on fructose, and contain two mutant genes hxk1 and hxk2 each. The mutations are recessive and noncomplementing. Genetic analysis suggests that these tw…
A strong temperature dependence has been observed for the first time in angle-resolved photoemission (ARP) spectra of the valence band of a crystalline solid. This spectral behavior confirms predictions of a model suggested by Shevchik. A controversial point in the interpretation of ARP spectra at x-ray energies is re…
Abstract The electrical conductivity of a wide variety of organic materials is reviewed and a comparison made between those materials which transport charge efficiently and those that do not. This comparison reveals that the most efficient conductors contain molecules (a) whose radical ions form a new aromatic sextet…
The number of structural isomers obtainable from all possible substitutions in an alicyclic hydrocarbon is found by the use of Burnside's Lemma. Four classes of compounds exist according to the number of vertices of the ring, and the number and type of substituents on the carbons. The theory is also applicable to othe…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleElectron spin resonance spectra of low-symmetry pseudotetrahedral high-spin cobalt(II) complexes. Tetra-n-butylammonium tribromo(quinoline)cobaltate(II)A. Bencini and D. GatteschiCite this: Inorg. Chem. 1977, 16, 8, 2141–2142Publication Date (Print):August 1, 1977Publication His…
The pressure-temperature phase diagram of ferroelectric NH 4 HSO 4 was studied by means of dielectric and differential thermal analysis (DTA) measurements in a pressure and temperature region of \(p{\lesssim}8\times10^{3}\) kg cm -2 , –120°C \({\lesssim}T{\lesssim}\)200°C. The high pressure phase found by Bridgman abo…
Abstract Es werden die Ergebnisse der röntgenographischen Einkristallstruktur‐untersuchung des auf den Oktaederplätzen geordneten hexagonalen Elpasoliths Ba (NiSb 2 ) (6) O 9 mitgeteilt. (Raumgruppe: C ; a = b = 5,837 Å, c = 14,392 Å; Z = 2). Das Gitter besteht aus dichtest gepackten BaO 3 ‐Schichten mit der Stapelfol…
Abstract The G HCI values of γ‐irradiated PVC mixtures were studied after addition of various amounts of three epoxy stabilizers: diglycidyl ether of 2,2‐bis(4‐hydroxy‐3‐methylphenyl)propane (I); diglycidyl ether of 1,1‐bis(4‐hydroxyphenyl)cyclohexane (II), and butyl‐ cis ‐9,10‐epoxystearate (III). The results indicat…
Abstract 4′-Vinylbenzo-15-crown-5 was conveniently synthesized in 30% yield by the reaction of diazotized 4′-aminobenzo-15-crown-5 with ethylene (6–10 kg/cm2) in the presence of zerovalent palladium at room temperature.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of magnesium bromide-tetrahydrofuran complexes: bis(tetrahydrofuran)magnesium bromide, orthorhombic, and diaquotetrakis(tetrahydrofuran)magnesium bromide, triclinicRaghupathy Sarma, Fausto Ramirez, Brian McKeever, Yu Fen Chaw, James F. Marecek…
The first stable, high molecular weight phosphazene polymers that contain alkyl- or aryl- groups bonded directly to phosphorus have been synthesized by the interaction of organolithium or dialkylmagnesium reagents with poly-(difluorophosphazene). The polymers are elastomers or tough, flexible, film-forming materials.
Cesium carbonate (Cs2CO3) was heated to the decomposition temperature of approximately 600 °C. The nonvolatile decomposition products were condensed on a nickel substrate while the carbon dioxide was removed by pumping. The deposited material is characterized by an effective work function of between 1.05 and 1.15 eV a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImidazolate complexes of ferric porphyrinsMario Nappa, Joan S. Valentine, and Patricia A. SnyderCite this: J. Am. Chem. Soc. 1977, 99, 17, 5799–5800Publication Date (Print):August 1, 1977Publication History Published online1 May 2002Published inissue 1 August 1977https://doi…
Sound velocities in perovskite-type crystal CsPbBr 3 have been measured around the structural phase transition points at 88 and 130°C. “Detwinned” samples were used, which made it possible to relate the measured velocities to the elastic constants in each phase. The velocities of c 11 and c 11 – c 12 modes exhibit lar…
Abstract Sesquioxidic soil clays from Oxisols in South Africa, Australia and Brazil, and two clays from Andosols in Japan and New Zealand, were investigated by selective dissolution techniques. Acid ammonium oxalate (pH 3) was found to be superior to currently popular alkaline reagents for extracting amorphous alumino…
Gd(IO3)3, type I, crystallizes in the monoclinic system with space group P21/a and four formulas in the unit cell. The lattice constants, at 297 °K, are a=13.4365(9), b=8.5226(5), c=7.1356(5) Å and β=99.717(7) ° for λCuKα1=1.540598 Å. A total of 5012 independent reflections were measured on a CAD-4 diffractometer, usi…
Abstract A reliable method, utilizing a fluoride ion-selective electrode, is described for the determination of fluoride in clays and shales. Interference by aluminum and iron is minimal. The reproducibility of the method is about ±5% at different levels of fluoride concentration. Data are presented for various clay m…
Absorption and magnetic circular dichroism (MCD) spectra are reported for the 7 F 6→5 D 4 transition of Tb3+ in crystalline Cs2NaTbCl6. These spectra are interpreted in terms of a crystal-field analysis of Tb3+ situated in an octahedral site with six Cl- nearest neighbours. The extensive, well-resolved vibrational str…