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  • Inorganic Chemistry  (4)
  • ASTRONOMY  (3)
  • ELECTRONIC COMPONENTS AND CIRCUITS
  • 1975-1979  (7)
  • 1960-1964
  • 1979  (3)
  • 1975  (4)
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  • 1975-1979  (7)
  • 1960-1964
Year
  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonyl Metal Compounds with Polydentate Cyclic Ligands. I. Pentacarbonyl Complexes of s-Trithiane and Related CompoundsThe complexes (RCHS)nM(CO)5 (R = H, CH3, n = 3; R = H, n = 4; M = Cr, Mo, W) were prepared from the tetrahydrofuran pentacarbonyl metal compounds and the respective ligands. The Cotton-Kraihanzel force constants of these complexes indicate the sulfur ligands to be slightly more basic than triphenylphosphine. The trimethyltrithiane complexes (R = CH3, n = 3) exhibit rapid intramolecular exchange of the M(CO)5-group along the three coordination centers of the ligand.
    Notes: Die Komplexe (RCHS)nM(CO)5 (R = H, CH3, n = 3; R = H, n = 4; M = Cr, Mo, W) wurden aus den Tetrahydrofuran-pentacarbonylmetallverbindungen und dem jeweiligen Liganden dargestellt. Die Cotton-Kraihanzel-Kraftkonstanten dieser Komplexe weisen die Schwefelliganden als geringfügig schwächere Akzeptoren, verglichen mit Triphenyl-phosphin, aus. Die Komplexe des Trimethyltrithians (R = CH3, n = 3) zeigen einen raschen intramolekularen Austausch der M(CO)5-Gruppe über die drei Koordinationsstellen des Liganden.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 418 (1975), S. 208-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some Substitution Reactions of Trimeric ThioformaldehydeTreatment of s-trithiane with n-butyllithium results in the formation of lithium salts of carbenium ions. Their reactions with the halo-functional compounds lead to mono- or multi-substituted trithianes besides lithium chloride.
    Notes: Die Behandlung von s-Trithian mit n-Butyllithium führt zu Lithiumsalzen von Carbanionen. Bei der Umsetzung mit den halogenfunktionellen Verbindungen CH3J. (CH3)3SiCl, (CH3)3GeCl, (CH3)3SnCl und (CH3)2SiCl2 reagieren diese unter Abspaltung von LiCl zu ein- oder mehrfach substituierten s-Trithianen.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 452 (1979), S. 112-122 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Nucleophilic Degradation of Tris(pentasulfido)platinum(IV), [Pt(S5)3]2-, and Bis(pentasulfido)platinum(II), [Pt(S5)2]2-The behaviour of [Pt(S5)3]2-, (I), towards sulfite, arsenite, sulfide, hydroxide, and triphenylphosphine has been studied qualitatively and quantitatively. With stoichiometric amounts of nucleophile one ring is degraded; the reaction product [Pt(S5)2]2-, (II), can be isolated. With excess of nucleophile all sulfur atoms are taken off from the platinum; with triphenylphosphine, however, (PPh3)2PtS4, (III), is formed. A mechanistic interpretation of the course of the reaction is given and supported by kinetic studies.
    Notes: Das Verhalten von [Pt(S5)3]2-, (I), gegenüber Sulfit, Arsenit, Sulfid, Hydroxid und Triphenylphosphin wird qualitativ und quantitativ untersucht. Mit stöchiometrischen Mengen an Nukleophil wird ein Ring abgebaut; als Reaktionsprodukt kann [Pt(S5)2]2-, (II), isoliert werden. Mit Überschuß an Nukleophil werden alle Schwefelatome vom Platin abgelöst; mit Triphenylphosphin entsteht dagegen (PPh3)2PtS4, (III). Der Reaktionsablauf wird mechanistisch gedeutet und durch kinetische Untersuchungen erhärtet.
    Additional Material: 6 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 160-166 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Addition Compounds between Antimony(III)-Halides and 1,4-DithiacycloheptaneSbCl3, SbBr3, and SbI3 do form the addition compounds SbCl3 · 1,4-Dithiacycloheptane, SbBr3 · 1,4-Dithiaheptane and 2 SbI3 · 1,4-Dithiacycloheptane from benzene solutions. The new compounds are only stable in the solid form. FIR spectra of the SbCl3 and SbBr3 complexes are recorded as well as the X-ray structure of the SbCl3 compound.
    Notes: Aus benzolischen Lösungen von SbCl3, SbBr3 und SbI3 bilden sich mit 1,4-Dithiacycloheptan die nur in fester Form existenzfähigen Verbindungen SbCl3 · 1,4-Dithiacycloheptan, SbBr3 · 1,4-Dithiacycloheptan und 2 SbI3 · 1,4-Dithiacycloheptan. Die FIR-Spektren der SbCl3- und SbBr3-Addukte sowie die Röntgenstrukturanalyse der SbCl3-Verbindung werden mitgeteilt.
    Additional Material: 2 Ill.
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  • 5
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 202; Dec. 1
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  • 6
    Publication Date: 2019-06-27
    Description: Optical studies are reported for a representative sample of 10 unidentified high galactic latitude X-ray sources that are north of declination minus 25 deg and that have 3U error boxes less than or of the order of 0.5 square degrees. The source 3U 1410-03 is identified with a peculiar emission-line spiral galaxy, NGC 5506, and a distance group 4 rich cluster of galaxies, Abell 2142, is suggested as a possible identification for 3U 1555+27. It is shown that very few of the unidentified high galactic latitude sources are quasi-stellar sources brighter than 17.5 mag, although one possible X-ray quasar, NAB 0137-01, is reported.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 199; July 1
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  • 7
    Publication Date: 2019-06-27
    Description: IUE observations indicate that the spectrum of 3C 273 is similar to that of other large-redshift quasars. There is a large excess of flux in the range 2400 A to 5300 A, which encompasses the Balmer jump region but which does not appear to be explainable by Balmer emission. The intensity ratio of Lyman-alpha to H-beta is 5.5, in agreement with other measures and a factor 6 smaller than the recombination value. The only absorption lines in the spectrum are due to our Galaxy. There is marginal evidence for a depression of the continuum shortward of the Lyman-alpha emission line, but the errors are too large to warrant any conclusion that 3C 273 has a rich absorption-line spectrum such as that seen in large-redshift quasars. The absence of emission and absorption lines of Fe II leads to the conclusion that resonance fluorescence probably produces the visual Fe II emission lines.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 230
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