Materials Literature
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Abstract The distribution of alkali metal picrate complexes of macrocyclic polyether (dibenzo-18-crown-6) between water and benzene was investigated. The polyether-cation complexes were found to be of a 1:1 stoichiometry. The formation of 2:1 complexes was recognized for Rb and Cs in a large excess of the poiyether. T…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. Hasegawa, B. E. Argyle, L‐J. Tao; Temperature dependence of magnetization in amorphous Gd‐Co‐M…
Under tensile strain the inhomogeneous surface microstructure of thin polystyrene films gave rise to the formation of ∼300 Å nuclei in which large strains were localized even at the glass transition. At lower temperatures these nuclei coalesced into disk-shaped microneck zones. Fibril formation within these zones and…
A system which accomplishes high−speed, electron−stimulated Auger electron spectroscopy (AES) and x−ray photoelectron spectroscopy with a double−pass cylindrical−mirror analyzer (CMA) is described. The CMA is well suited for AES because of its very high transmission, but has found very limited use in ESCA studies. In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible oxygenation and autoxidation of a capped porphyrin iron(II) complexJoseph Almog, Jack E. Baldwin, and Joel HuffCite this: J. Am. Chem. Soc. 1975, 97, 1, 227–228Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue…
The dependence of the steady-state creep rate, εs, on stress, σ, and temperature, T, for pure copper and a two-phase copper–4.04 wt.-% cobalt alloy at 712 K can be described asFor copper, the stress exponent, n, is ∼4.8 and the activation energy for creep, Q c, is ∼ 115 kJ/mol. For the copper–cobalt alloy, n≃5 and Qc≃…
In this article we demonstrate the importance of the indirect interaction via the phonon field between pairs of defects in an amorphous material. Using only the approximate value of the lattice coupling constant it is shown that the exchange interaction is large. The most important conclusion that can be drawn from th…
The electric permittivity of nematic 44′ n-pentylcyanobiphenyl has been measured in the presence of electric and magnetic fields. Values of the permittivity components for the aligned state have been obtained and analysed in terms of the statistical theory of Maier and Meier. The behaviour of bulk samples of the mater…
Extraction of fetal bovine skin at neutral pH and in the presence of protease inhibitors solubilized substantial amounts of type I and type type III collagen and Type III procollagen. Type I and Type III collagen were separated from each other by salt precipitation, and DEAE-cellulose chromatography was used to separa…
The interactions of O2, H2O, CO, CO2, NO, N2O, NO2, H2S and SO2 with evaporated nickel films have been studied over temperatures of 77 to 400 K and adsorbate pressures of 10–8 Torr to several Torr. The reactions range from reversible adsorption at 77 K only (CO2) to complex molecular and dissociative adsorptions leadi…
Kinichiro KAJIKAWA, Toshiki YAMAGUCHI, Shogo KATSUDA, Atsuo MIWA; An Improved Electron Stain for Elastic Fibers Using Tannic Acid, Journal of Electron Micr
The mean escape depths of Si 1s, Si 2p, and O 1s photoelectrons from silicon−silicon dioxide structures were determined over a wide kinetic−energy range with magnesium, aluminum, and chromium x−ray sources. Variations in photoelectron line intensity were measured as a function of oxide film thickness. Film thicknesses…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of Crystalline Pyrophosphoric Acid and Its SaltsChung Y. ShenCite this: Ind. Eng. Chem. Process Des. Dev. 1975, 14, 1, 80–85Publication Date (Print):January 1, 1975Publication History Published online1 May 2002Published inissue 1 January 1975https://pubs.acs.org/d…
Des amphiboles orthorhombiques participent fréquemment aux paragenèses des amphibolites à sapphirine des Pyrénées. Leur composition, remarquablement alumino-magnésienne, permet d'élargir le domaine de composition actuellement connu pour ces minéraux. Un des échantillons représente le terme naturel le plus proche, actu…
Three different salts of the [AuBr4]– ion display the resonance Raman effect when irradiated in the solid state with any one of several different exciting lines (frequency νo). For 457·9 nm excitation, which approximately coincides in frequency with that of an intense electronic band maximum (νe) of the anion, the res…
The 4,5-epidioxide of 2,4,5-triphenyl-1-(2,4,5-triphenyl-2H-imidazol-2-yl)imidazole is obtained by methylene blue sensitised photo-oxidation at –50 °C; it undergoes isomerisation, reduction, and degradation reactions, leading inter alia to 2-benzoyl-1,2-dihydro-2,4,6-triphenyl-1,3,5-triazine and 1,3a,4(6),6a-tetrahydr…
Abstract The crystal structure of a metal free corrin hydrochloride synthesised by Eschenmoser & Fischli has been found by X‐ray analysis. The crystals are monoclinic and contain ethanol of crystallisation; a = 10.84 Å, b = 12.04 Å, c = 26.04 Å, γ = 120.4 in space group P2 1 /a. The structure was determined by dir…
In this account 34 species of plankton diatoms identified from the collections made during the cruises of R. V. Varuna and from thf collections of Cochin Backwater are described. Except one species, others are new distributional records from the Indian Seas. A brief remark on the distributional records of some of thes…
Mössbauer spectra of 13 four-co-ordinate, formally IrI, species are reported. The comparatively small differences in the electronic environments of the iridium nuclei in these complexes are attributed to the interaction between the metal–ligand bonds in these molecules leading to compensation effects. This interpretat…
Abstract Iron(III) complexes with several tetradentate Schiff Bases [FeLXY]n+ and [Fe salen CN] were synthesized, where L is a tetradentate Schiff Base including salen = NN′-ethylenebis(salicylideneiminate), X and Y represent imidazole and cyanide ion. Magnetic susceptibilities and ESR spectra were measured for these…