29. Photochromism in some spiropyrans. Part III. The extent of phototransformation
R. Heiligman-Rim, Y. Hirshberg and E. Fischer, J. Chem. Soc., 1961, 156 DOI: 10.1039/JR9610000156
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Über polyamide aus heterocyclischen dicarbonsäuren
Abstract Aus 21 heterocyclischen Dicarbonsäuren wurden lineare Polyamide hergestellt. Kondensationen durch Schmelzen von Hexamethylendiammoniumsalzen waren ungünstig, da die Produkte decarboxylierten, während Kondensationen über Ester etwas bessere Resultate gaben. Einige Salze ließen sich überhaupt nicht kondensieren…
Differential Thermal Analysis and Thermogravimetric Analysis of Fission Product Oxides and Nitrates to 1500° C.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential Thermal Analysis and Thermogravimetric Analysis of Fission Product Oxides and Nitrates to 1500° C.P. F. Campbell, M. H. Ortner, and C. J. AndersonCite this: Anal. Chem. 1961, 33, 1, 58–61Publication Date (Print):January 1, 1961Publication History Published onlin…
Optical and electrical effects of radiation damage in diamond
C. D. Clark, P. J. Kemmey and E. W. J. Mitchell, Discuss. Faraday Soc., 1961, 31, 96 DOI: 10.1039/DF9613100096
Contact angles; wetting and de‐wetting of mercury: Part I. A critical examination of surface tension measurement by the sessile drop method
Abstract A survey is given of the existing methods for measuring the surface tension from the geometry of sessile drops. These methods, which generally consist of the measurement of simple drop dimensions, are insufficiently accurate for use with adsorption studies. A new procedure is described to find the surface ten…
An Electrometric and Electron Diffraction Study of Air-Formed Oxide Films on Iron
Oxide films formed at room temperature on iron single crystals and poly‐crystals have been investigated by electron diffraction and electrochemical methods. The structure of the oxide is found to vary from an Fe 3 O 4 type material at the metal/oxide interface to a γ ‐ Fe 2 O 3 type material at the oxide/gas interface…
149. The structure of “cyclopropane platinous chloride”
D. M. Adams, J. Chatt, R. G. Guy and N. Sheppard, J. Chem. Soc., 1961, 738 DOI: 10.1039/JR9610000738
Phase Equilibria and Tin-Activated Luminescence in Strontium Orthophosphate Systems
Strontium orthophosphate undergoes a rapid, reversible transition at 1305°C. The high‐temperature β form of pure Sr 3 ( PO 4 ) 2 cannot be quenched to room temperature, even with extremely rapid cooling. Determination of phase relationships on the orthophosphate joins between Sr 3 ( PO 4 ) 2 and each of the three orth…
Corrosion and Electrochemical Behavior of Chromium-Noble Metal Alloys
Alloying chromium with small amounts of platinum, palladium, iridium, rhodium, ruthenium, or osmium markedly improves its corrosion resistance to nonoxidizing acids such as sulfuric or hydrochloric acid. The presence of rhodium, palladium, or osmium has little influence on the resistance of chromium to an oxidizing ac…
Élargissement et déplacement des raies de résonance magnétique causés par une excitation optique
L'effet global des processus d'absorption et d'émission de photons de résonance optique sur l'état fondamental d'un ensemble d'atomes est étudié à partir d'équations d'évolution établies précédemment. On met ces équations sous une forme plus simple grâce à une « approximation séculaire», toujours valable dans les cas…
Phtalocyanine in wässeriger Lösung I
The behaviour of metal‐free phthalocyanine‐tetrasulfonate and some metal derivatives in aqueous solution has been investigated. It was found that most of these compounds dimerize in diluted aqueous solution. The stabilities of these dimers have been determined by spectrophotometric measurements.
182. Conjugated macrocycles. Part XXXII. Absorption spectra of tetrazaporphins and phthalocyanines. Formation of pyridine salts
M. Whalley, J. Chem. Soc., 1961, 866 DOI: 10.1039/JR9610000866
Étude de l'antiferromagnétisme helicoidal de MnAu2 par diffraction de neutrons
Une étude par diffraction de neutrons a montré que la structure de MnAu 2, quadratique centrée, peut être considérée comme un empilement, normalement à l'axe c, de feuillets de manganèse séparés par deux feuillets d'or. MnAu2 est d'autre part un hélimagnétique : tous les atomes de manganèse d'un même feuillet ont leur…
Sn1 Nuclear Magnetic Resonance Spectra1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSn1 Nuclear Magnetic Resonance Spectra1John J. Burke and Paul C. LauterburCite this: J. Am. Chem. Soc. 1961, 83, 2, 326–331Publication Date (Print):January 1, 1961Publication History Published online1 May 2002Published inissue 1 January 1961https://pubs.acs.org/doi/10.1021/j…
The Influence of Iodide Ions and Carbon Monoxide on the Anodic Dissolution of Active Iron
The kinetics of the dissolution of iron in sulfuric acid was investigated by polarizaton measurements in the presence of iodide ions or carbon monoxide as an inhibitor. The measurements included an oscillographic study of transient phenomena as well as steady states. The adsorption of iodide ions on iron was measured…
510. The infrared spectra of some metal alkoxides, trialkylsilyloxides, and related silanols
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ELECTRON MICROSCOPE STUDIES ON BLUE-GREEN ALGAE
Several species of blue-green algae were studied in thin sections with the electron microscope. Our electron micrographs confirm the view that the cell of blue-green algae is different and simpler in organization than the typical plant or animal cell. On the other hand, the general pattern of ultrastructure is the sam…
899. The structure of complex molybdenum(III) thiocyanates
J. Lewis, R. S. Nyholm and P. W. Smith, J. Chem. Soc., 1961, 4590 DOI: 10.1039/JR9610004590
Explanation of some `Forbidden' Transitions in Paramagnetic Resonance
The abnormal intensity of some `forbidden' hyperfine transitions in the paramagnetic resonance spectra of ions with S = 1 or more is shown to be due to cross terms in the spin Hamiltonian. These arise from off-diagonal terms in the electronic and nuclear interactions, and the computed transition intensities agree clos…
On the Solution of the Hartree-Fock Equation in Terms of Localized Orbitals
The Hartree-Fock method is discussed with emphasis placed on the transformation properties of the Hartree-Fock equation. It is emphasized that the Hartree-Fock equation may be solved in terms of non-orthogonal one-electron functions, and that in some cases it may be more convenient to choose such solutions. Equations…