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  • Inorganic Chemistry  (460)
  • ASTROPHYSICS  (326)
  • 1980-1984  (600)
  • 1935-1939  (186)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and I.R. Studies of the Complexes of Methylethyl-, EthyI(n-propyl)- and n-Propyl(n-butyl)tin Dichlorides with Some Nitrogen Donors (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 468 (1980), S. 231-234 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und IR-Untersuchungen der Komplexe von Methylethyl-, Ethyl(n-Propyl)-und n-Propyl (n-Butyl)zinn-dichloriden mit einigen StickstoffdonatorenEs wurden die Komplexe von Methylethylzinn-dichlorid mit 3-, 4-Picolinen, Isoquinolin und Benzylamin, von Ethyl(n-propyl)zinn-dichlorid mit Pyridin, 3-Picolin und Isoquinolin and von n-Propyl(n-butyl)zinn-dichlorid mit Isoquinolin, n-Propylamin and Benzylamin dargestellt und ihre Zusammensetzung aus dem Zinn- und Chlorgehalt bestimmt. IR-Messungen (4000-200 cm-1) weisen darauf hin, daß in allen hexakoordinierten Komplexen des Methylethyl-zinn-dichlorides die Chloratome in eis-Position stehen. Im Fall der hexakoordinierten Komplexe des Ethyl(n-propyl) und n-Propyl(n-butyl)zinn-dichlorides jedoch kann die mehrfache Aufspaltung der Zinn-Chlorvalenzbande auf dem Vorliegen von Konformationsisomeren beruhen. Leitfähigkeitsmessungen wurden zur Bestimmung des Ionencharakters ausgeführt.
    Notes: Complexes of methylethyltin dichloride with 3-, 4-picolines, isoquinoline and benzyl amine, of ethyl(n-propyl) tin dichloride with pyridine, 3-picoline and isoquinoline and of n-propyl (n-butyl)tin dichloride with isoquinoline, n-propyl amine and benzyl amine have been prepared and their stoichiometries established from their tin and chlorine contents. I.R. measurements (4000-200 cm-1) suggest that in all the hexa-coordinated complexes of methylethyltin dichloride, the chlorines are in cis-position. In case of hexa-coordinated complexes of ethyl(n-propyl)- and n-propyl (n-butyl) tin dichlorides, however, the multiple splitting of tin-chlorine stretching band may also be due to the presence of conformational isomers. The conductance measurements have also been carried out to determine their ionic character.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804680130
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction of Dinitrogentrioxide with Platinum(0) and Palladium(0) Complexes (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 472 (1981), S. 217-219 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Wechselwirkung von Distickstofftrioxid mit Platin(0)- und Palladium(0)-KomplexenN2O3 reagiert mit Pt0(PPh3)4 und Pd0(PPh3)4 unter N2 zu PtII(NO2)2-(PPh3)2 bzw. PdII(NO2)2(PPh3)2. In Gegenwart von Sauerstoff wird PtII(NO2)(NO3)(PPh3)2 bzw. PdII(NO2)(NO3)(PPh3)2 gebildet. Die Verbindungen werden durch Elementaranalyse, IR-Spektren, Leitfähigkeits- und magnetische Messungen charakterisiert.
    Notes: Dinitrogentrioxide reacts with tetrakis(triphenylphosphine) platinum and palladium under nitrogen to give dinitrobis(triphenylphosphine) platinum(II) and palladium(II) complexes, respectively. In the presence of oxygen these reactions afford the formation of nitro-nitrato complexes of platinum(II) and palladium(II). The products are characterized by the elemental analyses, i.r. spectra, conductivity and magnetic measurements.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814720127
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  • 3
    Electronic Resource
    Electronic Resource
    Synthetische Versuche in der Pinan-Gruppe, II. Mitteil.: Versuch einer Synthese von Pinocamphon und Synthese von trans-symm. Homopinsäure (1937)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 70 (1937), S. 736-742 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19370700427
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  • 4
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    The correlated X-ray and optical time variability of TT Arietis (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results of Einstein X-ray observation and simultaneous optical observations of the cataclysmic variable TT Arietis extending over several binary orbits are reported. Evidence is found for correlations between the X-ray and optical variability of TT Ari on three distinct time scales: the 3.3 hour variability that has been associated with the orbital period of the star, the about 1000 s time scale of the irregular flickering activity, and the time scale of quasi-coherent oscillations which have periods of order 10 s. There is a modulation of the X-ray flux with a period consistent with the orbital period of approximately 200 minutes, but there is no apparent modulation of the X-ray spectrum. The optical flux is modulated with a similar period and may lag the X-ray modulation by about 0.1 in phase. The X-ray spectrum is well fitted by a thermal bremsstrahlung plus Gaunt factor model. The results suggest that the hard X-ray emission may be produced in a corona above and below the inner accretion disk.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 270; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Quasi-simultaneous observations of BL Lac object Mrk 501 in X-ray, UV, visible, IR, and radio frequencies (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations in the X-ray, UV, visible, IR and radio regions of the BL Lac object Mrk 501 made over the course of two months are reported. The measurements were made with the A2 experiment on HEAO 1 (X-ray), the SWP and LWR cameras on IUE (UV), the 5-m Hale telescope (visible), the 2.5-m telescope at Mount Wilson (IR), the NRAO 92-m radio telescope at Green Bank (4750 MHz) and the 46-m radio telescope at the Algonquin Observatory (10275 and 10650 MHz). The quasi-simultaneously observed spectral slope is found to be positive and continuous from the X-ray to the UV, but to gradually flatten and possibly turn down from the mid-UV to the visible; the optical-radio emission cannot be accounted for by a single power law. The total spectrum is shown to be compatible with a synchrotron self-Compton emission mechanism, while the spectrum from the visible to the X-ray is consistent with synchrotron radiation or inverse-Compton scattering by a hot thermal electron cloud. The continuity of the spectrum from the UV to the X-ray is noted to imply a total luminosity greater than previous estimates by a factor of 3-4.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 243
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Simultaneous optical and X-ray bursts from 4U/MXB 1636-53 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Methods of obtaining information about the geometry of X-ray burster systems from simultaneous optical and X-ray observations are discussed, and such simultaneous observations of 4U/MXB 1636-53 are reported. The physical idea of an optical burst being due to reprocessing of an X-ray burst in material in the vicinity of the compact object is discussed. The resulting modification of the X-ray burst signal is described in terms of an optical response function. Delay and smearing due to radiative processes are discussed along with those due to the geometry. For 4U/MXB 1636-53, the estimated delay is 2.5 seconds, the smearing is less than four seconds, and the maximum temperature of the reprocessing region is about 75,000 K. The projected area of the reprocessing region is about 6 x 10 to the 21st square cm. The neutron star is about 1.4 solar masses, the radius of the accretion disk is greater than 1.5 lt-sec, and the mass of the Roche lobe filling companion star is less than 2.0 solar masses, corresponding to a binary period between about one and ten hours.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 263
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Delays of optical bursts in simultaneous optical and X-ray observations of MXB 1636-53 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations of simultaneous optical and X-ray bursts from 4U/MXB 1636-53 were made using the Hakucho burst monitor system and optical telescopes at the European Southern Observatory during 1979 and 1980. The six best cases among the 10 coinciding observations are analyzed in terms of a model in which the optical emission is the result of reprocessing of X-rays (through blackbody heating). From this analysis, the temperature (spatially averaged) and size of a reprocessor, and the smearing and delay of the optical bursts are obtained. For the maximum temperatures of the optical reprocessor, the values differ from burst to burst, ranging from about 3 x 10 to the 4th to about 10 to the 5th K. The present analysis suggests that the size of the reprocessor varies by a factor of a few. For the smearing of the optical bursts an upper limit of a few seconds is derived. The most important result of this analysis is that the delay times are not the same for all bursts. The possible constraints which these results put on a low-mass binary model of this burst source are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 283; 774-781
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    Electronic Resource
    Electronic Resource
    Über Natriumpolyphosphate (1938)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 237 (1938), S. 113-131 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurde die Existenz des in der Literatur beschriebenen Natriumtriphosphats Na5P3O10 röntgenographisch bestätigt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19382370202
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  • 9
    Electronic Resource
    Electronic Resource
    Über Natriumpolyphosphate. (II. Teil) (1939)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 241 (1939), S. 196-204 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19392410206
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen an katalytisch aktiven Oberflächenverbindungen. VII. Katalytische Eigenschaften von Vanadiumoxid-Chromoxid-Aufschicht-Katalysatoren (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 479 (1981), S. 199-211 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Catalytically Active Surface Compounds. VII. Catalytic Properties of Oxidic Vanadium-Chromium CatalystsThe catalytic properties of silica supported vanadium-chromium catalysts for the oxidation of ethanol, butane, propene, and butene are described and completed by ESR measurements.Differences in catalytic activity of chromium-free vanadium catalysts which are caused by different values of the silanol group concentration of the support are shown to become levelled by the addition of chromium. V—O—Cr species of medium catalytic activity are considered to be the catalytic active center. ESR spectra taken after the reaction show the existence of Cr3+ and VO+2 species. A correlation between the intensity of the VO2+ signal and the catalytic activity of the samples is observed.
    Notes: Die katalytischen Eigenschaften von Vanadiumoxid-Chromoxid-Aufschichtkatalysatoren wurden bei der Oxydation von äthanol, Butan, Buten und Propen untersucht und ergänzende ESR-spektroskopische Messungen durchgeführt.Die großen, durch unterschiedliche Silanolgruppenkonzentration des Trägers bedingten Aktivitätsunterschiede der chromfreien Vanadiumoxid-Aufschichtkatalysatoren werden mit wachsendem Chromoxidgehalt nivelliert. Als katalytisch aktives Zentrum werden V—O—Cr-Gruppierungen mit mittlerer Aktivität diskutiert. ESR-Spektren zeigen die Existenz von Cr3+- und V4+-Ionen nach der katalytischen Reaktion, und es wird ein Zusammenhang zwischen der Intensität des VO2+-Signals und der katalytischen Aktivität der Katalysatoren beobachtet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814790825
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