40. Aspects of stereochemistry. Part XI. Epoxide formation in the cyclohexene and bicycloheptene series
H. B. Henbest and B. Nicholls, J. Chem. Soc., 1959, 221 DOI: 10.1039/JR9590000221
Materials Literature
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On the influence of 3d4 ions on the magnetic and crystallographic properties of magnetic oxides
After a brief reference to the physical basis for a tetragonal distortion (c/a > 1) of an octahedral anion interstice which is occupied by a cation with outer-electron configuration 3d4, the crystallographic properties of several Mn3+-containing oxides are given to illustrate the significance of this effect for determ…
Über bi‐ und polycyclische Azulene, XXXVII. Synthesen und Eigenschaften von Azulen‐aldehyden
Abstract Azulen‐aldehyde‐(1) bzw. ‐(3) lassen sich nach dem Verfahren von V ILSMEIER darstellen. Sie sind reaktionsträger als aromatische Aldehyde. Die Aldehydgruppe läßt sich durch Reduktion nach H UANG ‐M INLON in die Methylgruppe überführen. Die dabei eintretenden spektralen Verschiebungen werden diskutiert. An ein…
An Investigation of the Compound Silicon Boride (SiB[sub 6])
Single crystals of the compound silicon hexaboride have been prepared. Laue, rotation, and Weissenberg photographs indicate an orthorhombic cell with lattice parameters a = 14.39 ± 0.01 , b = 18.27 ± 0.01 , and c = 9.88 ± 0.01 A å . The pycnometer density is 2.43 g/cm 3 . The average electrical resistivity of single c…
422. Experiments towards the synthesis of corrins. Part I. The preparation and reactions of some Δ 1 -pyrrolines. A novel proline synthesis
R. Bonnett, V. M. Clark, A. Giddey and A. Todd, J. Chem. Soc., 1959, 2087 DOI: 10.1039/JR9590002087
Mass Spectrometric Study of Inter-Group IVB Molecules
The systems germanium-graphite and germanium-silicon-carbon have been studied. Several gaseous molecules containing Ge, Si, and/or C were observed and their dissociation energies determined from measured partial pressures. A general picture of the dissociation energies of di-, tri-, and tetraatomic intergroup IVB mole…
The relationship between structure and properties of crystalline, high‐melting polyhydrocarbons
Abstract Twenty‐two α‐olefin monomers with varying degrees and types of branching in the lateral group have been polymerized and the polymers characterized. In general, the closer the branching in the side chain is to the polyethylene trunk, the higher the degree of crystallinity and the crystalline melting point. The…
Sur les effets des interactions entre les domaines élémentaires ferromagnétiques : Bascule et reptation
L'auteur développe une théorie élémentaire des couplages entre domaines ferromagnétiques à cycles rectangulaires, basée sur l'étude détaillée des propriétés de couples de deux domaines : il prévoit ainsi des effets théoriques nouveaux et notamment celui de bascule. Il s'agit d'une variation positive ou négative de l'a…
The Growth of Barrier Oxide Films on Aluminum
The growth of anodically formed barrier oxide films on aluminum has been followed by weight, capacitance, and rate measurements. The increase of film thickness at constant voltage has been calculated and compared to the values obtained by optical measurements. The results have been shown to obey the law .
Substitution dans les hexaferrites de l'ion Fe3+ par Al3+ , Ga3+, Cr3+
L'aimantation à saturation absolue, les paramètres de la maille et les intensités des raies Debye-Scherrer ont été étudiés dans les composés BaO, (6-x) Fe2O3, xM2O3 où M = Al, Ga, Cr. On en déduit la répartition préférentielle des atomes M sur les sites cristallographiques 2a, 2b, 4f1, 4f2 et 12k du groupe P6/mmc. La…
Thermal expansion measurements and transition temperatures, first and second order
Abstract Transitions in polymers have been studied with the use of a differential expansion apparatus modified from a design described by K. L. Floyd. Materials ranging from uncured, soft rubbers to hard, waxy solids have been studied from above room temperature down to liquid air temperatures. Both the first‐order tr…
61. Magnetochemistry. Part II. The temperature-dependence of the magnetic susceptibility of bivalent cobalt compounds
B. N. Figgis and R. S. Nyholm, J. Chem. Soc., 1959, 338 DOI: 10.1039/JR9590000338
Zur Theorie der Sekundärelektronenemission von Metallen Der Anregungsprozeß
Abstract Die Anregung von Metallelektronen durch Primärelektronen mittlerer Energie wird mit der Diracschen Störungsrechnung in Einelektronennäherung untersucht. Für Prozesse ohne Quasiimpuls‐Austausch mit dem Gitter (ξ = 0‐Prozesse) wird die Anregungsfunktion streng abgeleitet. Die für ≠ 0‐Prozesse erhaltenen Ausdrüc…
Physical Chemistry of High Polymers
Abstract not Available.
Radiation Damage Effects in Ferroelectric Triglycine Sulfate
Peculiar changes in the ferroelectric hysteresis loops of single crystals of triglycine sulfate result when the crystals are subjected to ionizing radiations (x-rays and electrons). Fully polarized crystals develop hysteresis loops biased along the field axis while partially polarized crystals develop double-loop patt…
Ultraviolet induced crosslinking and grafting of solid high polymers
Abstract The production of crosslinks and of sites for grafting in solid high polymers can be achieved by hydrogen abstraction. This hydrogen abstraction reaction can be carried out by means of far ultraviolet light (200–300 mμ). The rate of the reaction is tremendously increased if certain sensitizers are incorporate…
Crystallinity effects in the electron microscopy of polyethylene
Single crystals of polyethylene were examined electron-microscopically with special precautions to avoid damage due to the electron beam. A variety of unexpected beam-sensitive features were observed. They can be classified as (1) moirés. (2) morphological features. In connection with (1) the general principles of moi…
Morphologische strukturen in polyäthylenen, polyamiden und anderen kristallisierenden hochpolymeren
Abstract Bei der Kristallisation von Niederdruckpolyäthylen aus Lösung in dünnsten Filmenerhält man lamellen‐bzw.fibrillenartige Einkristalle, in denen nach Elektronenbeugungsmessungen die Molekülketten senkrecht zur Lamellenbene bzw. zur Längsrichtung der Fibrillen stehen. Die Moleküle müssen also gefaltet sein. Bei…
Semiempirical Treatment of the Hydrogen Bond
A semiempirical treatment of the hydrogen bond based on a slightly modified Lippincott-Schroeder potential has been used to construct potential surfaces for simultaneous hydrogen and oxygen motion in OH···O hydrogen bonds. The resulting potential curves have been used to interpret the changes in infrared spectra and i…
The Molecular Configuration of Dicobalt Hexacarbonyl Diphenylacetylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Configuration of Dicobalt Hexacarbonyl DiphenylacetyleneW. G. SlyCite this: J. Am. Chem. Soc. 1959, 81, 1, 18–20Publication Date (Print):January 1, 1959Publication History Published online1 May 2002Published inissue 1 January 1959https://pubs.acs.org/doi/10.102…