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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1765-1771 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaktionen des Mangancarbonyls mit Phosphinen führen zu Monosubstitutionsprodukten, entspr. Mn(CO)4PR3, die je nach der Natur des Restes R ein- oder zweikernig gebaut sind. Einkernige, paramagnetische Verbindungen leiten sich von Triphenyl- oder Triäthylphosphin und den homologen Arsinen und Stibinen ab, während mit Tricyclohexylphosphin und Triphenylphosphit diamagnetische, zweikernige Derivate entstehen; in Lösung ist häufig ein temperaturabhängiges Gleichgewicht zwischen der monomeren und der dimeren Form anzunehmen. Auf Grund von IR-Spektren und Dipolmessungen wird der räumliche Bau der Verbindungen erörtert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 91 (1958), S. 2824-2829 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Tritylierung und Acetylierung der Saccharose wird eine Tritrityl-penta-acetyl-saccharose und daraus durch Tritylabspaltung eine Pentaacetyl-saccharose erhalten, die durch Acetylwanderung eine Iso-pentaacetyl-saccharose liefert. Die Konstitution beider Pentaacetate wird bewiesen.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 91 (1958), S. 1230-1234 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Reaktion des Kobaltcarbonyls mit Triphenylphosphin in polaren Mitteln wie Dioxan (bei 30°) führt im Sinne der Disproportionierung 2 Co° → Co⊕ + Co⊖ zu einer 2-ionigen Verbindung [CoI(CO)3(P(C6H5)3)2]⊕[Co-I(CO)4]⊖, die sich mit Komplexen wie [B(C6H5)4]⊖, [HgJ4]2⊖, [Cr(NH3)2(SCN)4]⊖ unter Bildung entspr. Salze des Tricarbonyl-bis-[triphenylphosphin]-Kations umsetzen läßt. Außerdem entsteht, besonders in indifferenten Mitteln (bei 0°), als echtes Derivat des Kobalttetracarbonyls das bisher allein bekannte Bis-[tric-carbonyl-triphenylphosphin-kobalt(0)], [Co(CO)3P(C6H5)3]2; häufig liegen Gemenge beider Verbindungen vor. - Die magnetochemische Untersuchung ergibt für die ionogene Verbindung Diamagnetismus, das Kation ist somit ein Durchdringungskomplex edelgasähnlicher Konfiguration; das Reinecke-Salz zeigt dementsprechend den Paramagnetismus den komplexen Chromat(III)-Anions. Der Diamagnetismus des Substitutionsproduktes beweist dessen zweikernige Struktur, wie sie schon bisher postuliert wurde.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 90 (1957), S. 2023-2024 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unter Anwendung einer kürzlich neu aufgefundenen, ohne Katalysator gemäß \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Me}\left({{\rm CO}} \right)_6 + {\rm Ar} \to {\rm ArMe}\left({{\rm CO}} \right)_3 + 3\,{\rm CO} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$\left({{\rm Me} = {\rm Cr},\,{\rm Mo},\,{\rm W};{\rm Ar} = {\rm C}_6 {\rm H}_6 {\rm und}\,{\rm Derivate}} \right) $$\end{document} bei erhöhter Temperatur verlaufenden Synthese wurden zahlreiche gemischte Sechsringaromaten-Metallcarbonyle von Cr, Mo und W dargestellt. Neben Benzol, seinen Alkylverbindungen und Naphthalin als kondensiertem Aromaten erwiesen sich auch Derivate mit einsamen Elektronenpaaren in der funktionellen Gruppe, wie z. B. C6H5Cl, C6H5OH, C6H5NH2, C6H5CO2CH3, als der π-Komplexbildung fähig. Aus CH3O2CC6H5Cr(CO)3 wurde durch alkalische Verseifung weiterhin HO2CC6H5Cr(CO)3 erhalten. Die meist gelben, sublimierbaren, diamagnetischen Verbindungen sind ebenso wie C6H6Cr(CO)3 und C4H4SCr(CO)3 als edelgaskonfigurierte Durchdringungs-komplexe mit zentralem, sechsbindigem Me0 aufzufassen.  -  Die an \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm C}_6 {\rm H}_5 {\rm OHCr}\left({{\rm CO}} \right)_3,{\rm C}_6 {\rm H}_5 {\rm CO}_2 {\rm HCr}\left({{\rm CO}} \right)_3 \,{\rm und}\,{\rm C}_6 {\rm H}_5 {\rm NH}_2 {\rm Cr}\left({{\rm CO}} \right)_3 $$\end{document} gegenüber den jeweiligen freien Aromaten auftretende Aciditätssteigerung bzw. Basizitätsverminderung entspricht einem induktiven Effekt, der durch die Einbeziehung des π-Elektronensextetts in die Metallschale zustandekommt.
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  • 6
    Publication Date: 2011-08-24
    Description: The redetermination of the luni-solar precession is performed by using Very Long Baseline Interferometry (VLBI) catalogues of extragalactic radio sources containing positions at observation epochs which cover 9 years. The positions of the sources have been determined by the VLBI network of the Crustal Dynamics Project of NASA from measurements covering consecutive half year and one year intervals between 1981 and 1989. In the course of their reduction the International Astronomical Union (IAU) recommended precession terms were applied. On the assumption of an imperfection of the luni-solar precession it is expected that the positions of each source obtained at different epochs but uniformly reduced to the reference system J2000.0 exhibit an apparent proper motion. We attributed this motion tentatively to precession and solved for a correction of the luni-solar precession by making a least squares fit to the position differences between homonymous sources in the set of catalogues. The 18.6 yr terms of nutation entered the process as parameters the values of which were set by choice from the reservoir of recent determinations. Twenty-five sources contributed to the analysis with the effect that the annual and semi-annual catalogues contain 16 sources on the average. The analysis confirmed the slightly overestimated IAU value of the luni-solar precession yielding a mean correction of -3.59 +/- 1.14 mas/yr from the annual and -3.84 +/- 1.16 mas/yr from the semi-annual catalogues. We discuss these secular terms and their dependence on the adopted nutation terms.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 284; 3; p. 1000-1006
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  • 7
    Publication Date: 2013-08-31
    Description: All recent available, high quality measurements of the strong diffuse bands 5780 A and 5797 A have been collected. This includes those measurement derived from the authors's recent observations (February, May, and November 1993, taken with a echelle spectrograph) as well as those from a coude spectrograph and from literature. Equivalent widths of the diffuse interstellar bands (DIB's) at 5780 A and 5797 A have been measured on spectrograms. The measured signal-to-noise ratio (S/N) on their own spectrograms ranged from 250 to 500. The Johnson UBV data were used to estimate the color excesses of our targets.
    Keywords: ASTRONOMY
    Type: NASA. Ames Research Center, The Diffuse Interstellar Bands: Contributed Papers; p 39-43
    Format: application/pdf
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  • 8
    Publication Date: 2019-01-25
    Description: Models of ionized interstellar C60 predict a strong transition in the 1.2 micrometer region, and two candidate bands have recently been detected in reddened stars. We have searched for the stronger of these bands (at 13175 A) in the Taurus dark cloud complex, to determine its response to the dark-cloud environment. None of the three lines of sight studied (two near the cloud surface, one reaching A(sub V) greater than 20(sup m)) give rise to a detectable band; in one case the equivalent width is a factor of order three below that predicted. Since such behaviour is also shown by the optical Diffuse Interstellar Bands, we suggest that the 13175 A band is a genuine DIB, but we caution against an automatic interpretation in terms of an ionic carrier.
    Keywords: ASTRONOMY
    Type: NASA. Ames Research Center, The Diffuse Interstellar Bands: Contributed Papers; p 17
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  • 9
    Publication Date: 2019-07-13
    Description: A new identification of OB associations in M31 has been performed using the Path Linkage Criterion (PLC) technique of Battinelli (1991). We found 174 associations with a very small contamination (less than 5%) by random clumps of stars. The expected total number and average size of OB associations in the region of M 31 covered by our data set (Magnier et al. 1992) are approximately 280 and approximately 90 pc, respectively. M31 associations therefore have sizes similar to those of OB associations observed in nearby galaxies, so that we can consider them to be classical OB associations. This list of OB associations will be used for the study of the spatial distribution of OB associations and their correlation with other objects. Taking into account the fact that we do not cover the entire disk of M31, we extrapolate a total number of association in M31 of approximately 420.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 278; 1; p. 36-42
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  • 10
    Publication Date: 2019-08-28
    Description: We investigate the impact of hierarchical galaxy merging on the statistics of gravitational lensing of distant sources. Since no definite theoretical predictions for the merging history of luminous galaxies exist, we adopt a parameterized prescription, which allows us to adjust the expected number of pieces comprising a typical present galaxy at z approximately 0.65. The existence of global parameter relations for elliptical galaxies and constraints on the evolution of the phase space density in dissipationless mergers, allow us to limit the possible evolution of galaxy lens properties under merging. We draw two lessons from implementing this lens evolution into statistical lens calculations: (1) The total optical depth to multiple imaging (e.g., of quasars) is quite insensitive to merging. (2) Merging leads to a smaller mean separation of observed multiple images. Because merging does not reduce drastically the expected lensing frequency, it cannot make lambda-dominated cosmologies compatible with the existing lensing observations. A comparison with the data from the Hubble Space Telescope (HST) Snapshot Survey shows that models with little or no evolution of the lens population are statistically favored over strong merging scenarios. A specific merging scenario proposed to Toomre can be rejected (95% level) by such a comparison. Some versions of the scenario proposed by Broadhurst, Ellis, & Glazebrook are statistically acceptable.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 435; 1; p. 49-54
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