Materials Literature
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A detailed study of the reductive dissolution of NiFe2O4 by V(pic)–3 is reported. The kinetics of the reaction follow a cubic rate law and exhibit a first-order dependence on [VII], indicating that the rate-determining step involves attack by V(pic)–3 on FeIII ions at the oxide surface. Dependences on [H+] and [free p…
The electrochemical oxidation of NiL2+ (where L = meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) in aqueous solutions in the presence of sulfate, phosphate, chloride, and phthalate yields NiIIILX2. The stability constants for the axial coordination of the anions X are estimated from the observed red…
The annealing out of quenched-in vacancies has been studied, by transmission electron microscopy, in an ordered B2 type Fe-42 at.% Al single crystal. Slices of 〈111〉 and 〈001〉 orientation were quenched from 1000deg;C and annealed at 400deg;C for various times. In situ annealing has also been performed in a high-voltag…
EPR and electrical conductivity measurements under controlled thermal cycles demonstrate that a phase transition is occurring at about 22 K in (TMTSF)2ClO4. Slow cooling (12 K/h) yields a stable ground state exhibiting Pauli paramagnetism above and superconductivity below 1.2 K. In contrast, fast cooling (30 K/min.) y…
Ion implantation can be used to introduce network damage and to alter the chemical composition in glasses. Structural changes can be inferred from IR measurements near 1000 cm−1 and by optical absorption near 2150 Å. Implantation-induced damage decreases the implanted volume in fused silica with consequent changes in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical control of the internal Michael reaction. A new construction of trans-hydrindan systemsGilbert Stork, Christopher S. Shiner, and Jeffrey D. WinklerCite this: J. Am. Chem. Soc. 1982, 104, 1, 310–312Publication Date (Print):January 1, 1982Publication History Pub…
This paper seeks to update previous reviews of the effects of ionizing radiation on amorphous insulators. The electronic and atomic structures of radiation-induced defect centers (trapped electrons or holes) are discussed primarily in terms of data deriving from the technique of electron spin resonance. Emphasis is pl…
High pressure luminescence studies have been made on several tris rare earth betadiketonates. From this information the pathway for intramolecular energy transfer between ligand and rare earth ion localized levels is clearly established. The emission from europium dibenzoylmethide (EuDBM) and europium thenoyl-triflnor…
A mutant of Saccharomyces cerevisiae that was selected for resistance to carbon catabolite repression also had reduced hexokinase activity. Hexokinase isoenzymes were purified from mutant and wild type cells. The specific glucokinase and hexokinase isozyme PI were present at normal levels in mutant and wild type, but…
The dielectric function e(q, ω) for liquid water is determined from an insulator model with parameters fixed by available optical data. Ionization of the oxygen K shell is described by generalized oscillator strengths. This model dielectric function is used to calculate the stopping power of liquid water for electrons…
The collagen arrangement of different cartilages of several mammals was studied by the Picrosirius-polarization method applied to tissue sections whose proteoglycans had been previously removed by enzymatic digestion. This procedure not only increases collagen birefringency but it also enhances the optimal resolution,…
Abstract The interaction of NO 2 with a Pt(111) surface was studied by molecular beam and thermal desorption techniques. At 300 K NO 2 adsorbs dissociatively into NO ad + O ad with an initial sticking coefficient s o = 0.97. s o decreases slightly with increasing surface temperature; the variation of the sticking coef…
A theory of glasses at low temperatures is presented. The structure of glasses contains topologically stable Z2 line defects - in continuous random networks, they are uninterrupted lines threading through odd-numbered rings of bonds - which are represented as punctures in an otherwise continuous space. The overall hom…
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Binary phase transmission gratings exhibiting a certain number N of central diffraction orders of equal intensity can be used to construct star couplers of the 1-to-N and N-to-N type. The calculation of the grating's groove structure is described, and first experimental results are presented.
Culture properties of bovine aortic endothelial cells and bovine aortic smooth muscle cells have been examined in relation to collagen gels. Endothelial cells grown on collagen maintain typical monolayer morphology not only in relationship to the overlying medium but also with respect to the collagen substrate. Endoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural effects on the photopolymerization of bilayer membranesEncarnacion Lopez, David F. O'Brien, and Thomas H. WhitesidesCite this: J. Am. Chem. Soc. 1982, 104, 1, 305–307Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands. Variation of magnetic exchange interaction in a series of heterobinuclear CuII-MII complexesSusan L. Lambert, Clifford L. Spiro, Robert R. Gagne, and David N. HendricksonCite this: Inorg. Chem. 1982, 21, 1, 68–72Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(Tetrabenzoporphyrinato)nickel(II) iodide. A doubly mixed valence molecular conductorJens Martinsen, Laurel J. Pace, Terry E. Phillips, Brian M. Hoffman, and James A. IbersCite this: J. Am. Chem. Soc. 1982, 104, 1, 83–91Publication Date (Print):January 1, 1982Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties and crystal structure of (2,3-pyrazinedicarboxylato)copper(II) hydrochloride: a pyrazine bridged ferromagnetic linear chainCharles J. O'Connor, Cheryl L. Klein, Richard J. Majeste, and Louis M. TrefonasCite this: Inorg. Chem. 1982, 21, 1, 64–67Publication…