摘要:

Carbon dioxide has been irradiated with electron pulses at a dose rate of 2 × 1027 eV g−1 s−1. The measured carbon monoxide yield isG(CO) = 7.8 ± 0.3. Addition of SF6, an electron scavenger, reduces this yield toG(CO) = 4.8 which is the same, within the experimental error, as the low dose rate yieldG(CO) = 4.5 ± 0.5. The effect of SF6and the difference between the high and low dose rate yields is explained by suppression of dissociative neutralization of the C2O4+ion.

ISSN:0008-4042    

DOI:10.1139/v70-323

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

Le diagramme de fusion du système K–K2O est obtenu par la technique de l'analyse thermique différentielle. La fusion du monooxyde de potassium K2O se manifeste à 646 + 5 °C. Des transformations cristallines réversibles de l'oxyde sont observées à 317, 372 et 446 °C. La dismutation de l'oxyde en peroxyde et métal apparait à une température approximativement égale à celle de la dernière des transitions. Le diagramme K–K2O comporte un eutectique à une température très proche de la température de fusion du potassium et une monotectie à 600 °C (concentration monotectique: 30.5 % atomique d'oxygène). Aucune existence de sous-oxyde n'est démontrée.The potassium–oxygen phase diagram has been determined up to the composition of K2O by the technique of differential thermal analysis. Potassium monoxide K2O melts at 646 ± 5 °C. Reversible transitions occur in solid K2O at 317, 372, and 446 °C. Disproportion of the monoxide into the peroxide and metal occurs at a temperature identical or very near to that of the last transition. The K–K2O eutectic melts at a temperature very close to the melting temperature of pure K (degenerate eutectic) and the monotectic at 600 °C (monotectic concentration: 30.5 oxygen atomic %). No evidence has been obtained that would indicate the existence of a lower oxide.

ISSN:0008-4042    

DOI:10.1139/v70-324

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

The new complexes InX3L (X = Cl, Br, I; L = tricyclohexylphosphine), InX3L2(X = Cl, Br, I; L = trimethylphosphine, triethylphosphine, dimethylphenylphosphine), InX3L2(X = Cl, Br, L = diphenylethylphosphine), InX3L3(X = Cl, Br; L = dimethylphenylphosphine) have been prepared and characterized by far-infrared, Raman, and molecular weight studies. Structures of the typestranstrigonal bipyramidal InX3L2andC3υψ-tetrahedral InX3L can be readily characterized by virtue of their typical infrared and Raman spectra. Nuclear magnetic resonance chemical shifts and coupling constants for adducts of trimethylphosphine, triethylphosphine, dimethylphenylphosphine, and diphenylethylphosphine are discussed

ISSN:0008-4042    

DOI:10.1139/v70-325

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

Potentiostatic voltage-pulse experiments, carried out on anodically formed tantalum oxide films, show directly the existence of a dielectric polarization process which is driven by the passage of ion-current. Furthermore, quantitative analysis of the data yields a value for the constant coupling the polarization rate to the ion-current density, of the same order as that obtained from galvanostatic field transients, a result expected if the dielectric polarization of the film makes a large contribution to the effective field causing film growth. This experiment provides, therefore, convincing evidence in support of the main tenet of the dielectric polarization theory for anodic film growth (the ion-current-driven polarization process) with some support for the effective-field postulate also provided.

ISSN:0008-4042    

DOI:10.1139/v70-326

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

A35Cl nuclear quadrupole resonance study of the trimethylamine – boron trichloride complex has revealed line-width and frequency changes which correlate with transitions observed in the wide-line proton magnetic resonance study.

ISSN:0008-4042    

DOI:10.1139/v70-327

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

Tetrahydroharmol (3) was isolated fromShepherdiaargentea. Tetrahydroharmol (3), serotonin (12), and a new alkaloid shepherdine (2a) were isolated fromShepherdiacanadensis; and evidence was obtained for the presence of 6-hydroxytryptamine inS.canadensis.

ISSN:0008-4042    

DOI:10.1139/v70-328

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

A new species of yeast,Hansenulasydowiorum, excreted free α-hydroxy fatty acids when grown on glucose solution. The major component, 2-D-hydroxyhexadecanoic acid, was identified by the mass spectrum of its methyl ester.

ISSN:0008-4042    

DOI:10.1139/v70-329

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

The reaction of dialkyl phosphonates, (RO)2P(O)H where R = CH3, C2H5, andn-C4H9, with hexafluoroacetone gives, in each case, two isomeric products, (RO)2P(O)OCH(CF3)2and (RO)2P(O)C(OH)-(CF3)2. Products are characterized by elemental analyses, infrared, proton and fluorine nuclear magnetic resonance, and mass spectrometry. The relative yield of isomer depends markedly on the alkyl group present. These results are explained in terms of an inductive effect on the polarity of the P—H bond which influences the direction of addition of hexafluoroacetone.

ISSN:0008-4042    

DOI:10.1139/v70-330

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

1,2-Dithiole-3-thiones and 1,2,4-dithiazole-3-thiones react with dibenzoylacetylene to provide thioacylmethylene or thioacylimino-1,3-dithiole adducts respectively. Some of these, on sulfurization, provide thieno[3,4d]-1,3-dithiole derivatives, but in others a retro-1,3-dipolar reaction predominates. Further reaction of the initial adducts with more dibenzoylacetylene provides spiran compounds.

ISSN:0008-4042    

DOI:10.1139/v70-331

出版商:NRC Research Press    

年代:1970

数据来源: NRC

摘要:

The electron spin resonance spectra of several substituted pyrene cations, produced by oxidation with boron trifluoride in sulfur dioxide, are reported. The spectra are analyzed and the splitting constants given. With 4-chloropyrene, hyperfine splitting is observed due to the chlorine atom, for the first time in such a species. Molecular orbital calculations (Hückel and McLachlan) are presented for three of the compounds studied.

ISSN:0008-4042    

DOI:10.1139/v70-332

出版商:NRC Research Press    

年代:1970

数据来源: NRC