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  • Inorganic Chemistry  (5)
  • AC; Aircraft; Berlin, Germany; File name; File size; Uniform resource locator/link to image; Verlust_der_Nacht  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 313 (1961), S. 37-47 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: According to the method of Rice, Freamo, and Grelecki solid chloroamine has been decomposed at -190 °C by ultraviolet irradiation. The blue product formed is stable below -150 °C; it is already known from the analogous decomposition of hydrogen azide, and its formation can be understood only by the primary formation of nitrogen monohydride.  -  This result is supported by the identification of hydrogen cyanate during the thermal decomposition of gaseous chloroamine in the presence of carbon mon oxide (5 to 10 Torr, 500 °C). Under the same conditions, hydrazine too produces hydrogen cyanate.  -  Considering the result of Wannagat and Kohnen, who showed nitrogen monohydride and ammonia to form hydrazine, it follows that it is possible to synthesize hydrazine from chloroamine and ammonia via nitrogen monohydride as an intermediate.
    Notes: In Anlehnung an die Methodik von Rice, Freamo und Grelecki wurde festes Chloramin bei -190 °C durch ultraviolette Strahlung zersetzt. Das entstehende blaue Produkt, beständig unterhalb -150 °C, ist bereits durch die entsprechende Zersetzung des Hydrogenazids bekannt; seine Bildung ist nur durch primäres Auftreten von Stickstoffmonohydrid zu erklären.  -  Dieses Ergebnis wird durch den Nachweis von Hydrogencyanat im Anschluß an die thermische Zersetzung gasförmigen Chloramins in Gegenwart von Kohlenmonoxid (5 bis 10 Torr, 500 °C) bekräftigt. Auch Hydrazin liefert unter diesen Bedingungen Hydrogencyanat.  -  Unter Berücksichtigung des Befundes von Wannagat und Kohnen, daß Stickstoffmonohydrid mit Ammoniak zu Hydrazin reagieren kann, folgt, daß es ein experimentell gangbarer Weg ist, Hydrazin aus Chloramin und Ammoniak über Stickstoffmonohydrid als Zwischenprodukt zu synthetisieren.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: During the last fifty years the chemistry of chloroamine has been developed intensively. Many mechanisms for the reaction between chloroamine and ammonia have been forwarded and discarded again. Today, two mechanisms are discussed which so far both cannot be discarded: The SN2-mechanism and the mechanism including nitrogen monohydride as an intermediate. Nitrogen monohydride, prepared hitherto from hydrogen azide, ammonia, and hydrazine can be isolated at lower temperatures in probably oligomeric state.
    Notes: Nach über einem halben Jahrhundert intensiver Entwicklung der Chloraminchemie und nach Aufstellung und Widerlegung vieler Mechanismen für die Chloramin-Ammoniak Reaktion stehen sich heute zwei Mechanismen gegenüber, die beide durch die bisherigen Experimente nicht zu entkräften sind: Der SN2-Mechanismus und der Mechanismus über Stickstoffmonohydrid als Zwischenprodukt. Stickstoffmonohydrid läßt sich bisher aus Hydrogenazid, Ammoniak und Hydrazin erhalten und bei tiefen Temperaturen in wahrscheinlich oligomerem Zustand ausfrieren.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Infrared and RAMAN spectra of 14NCl3 and 15NCl3 dissolved in CCl4 or n-Hexane have been investigated in the region 4000 to 200 cm-1. Assuming C3v symmetry, force constants for the nitrogen trichloride molecule are calculated using the WILSON FG-Matrix method.
    Notes: Die Infrarotspektren von 14NCl3 und 15NCl3, gelöst in CCl4 bzw. n-Hexan, wurden im Bereich zwischen 4 000 und 200 cm-1 aufgenommen. RAMAN-Spektren beider Verbindungen in CCl4 wurden mit Hilfe eines Laser-RAMAN-Gerätes (Erregerfrequenz 5145 Å) registriert. Unter Annahme eines plausiblen Molekülmodelles der Symmetrie C3v wurde mit Hilfe der WILSONschen FG-Matrix-Methode ein vollständiger Satz von Kraftkonstanten (General Valence Force Field) berechnet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 378 (1970), S. 37-48 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Colourless phosphorus is volatile with CCl4 vapour. In the presence of oxygen, phosphorus vapour in gaseous CCl4 is only oxidised to a negligible extent. Quenching of phosphorus/CCl4 vapour mixture results in the formation of conglomerates of colourless phosphorus having molar masses up to 8200 (≙ 66 P4 molecules). Such conglomerates are oxidised by oxygen. The oxidation products exhibit an atomic ration P : 0 ≍ 2 : 3 being, however, no polymeric forms of P4O6 (as supposed by BLASER), but probably polymeric cross  -  linked mixed oxides with a statistical oxygen distribution.
    Notes: Farbloser Phosphor ist mit Tetrachlorkohlenstoff dampfflüchtig. Mit Sauerstoff erfolgt in Gegenwart von Tetrachlorkohlenstoffdampf nur eine unwesentliche Oxydation des Phosphordampfes. Beim Abschrecken des Dampfgemisches bilden sich Konglomerate von farblosem Phosphor entsprechend mittleren Teilchengewichten bis zu 8200. Solche Konglomerate werden durch Sauerstoff oxydiert, Die Oxydationsprodukte zeigen ein Phosphor-Sauerstoffverhältnis von ca. 2 : 3. Sie sind nicht, wie BLASER annahm, Polymere des Phosphor(III)-oxid, P4O6, sondern stellen wahrscheinlich polymere, vernetzte Mischoxide mit statistischer Sauerstoffverteilung dar.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 576 (1989), S. 225-228 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of (CH3)2 Te with CF3I: Preparation and Properties of [(CH3)2TeCF3]IThe irradiation of a mixture of (CH3)2 Te and CF3I at low temperature yields [(CH3)2TeCF3]I. From the thermal decomposition as well as in polar solvents CH3TeCF3 and CH3I are formed. Attempts to prepare bis- or tris(trifluoromethyl)tellurium compounds from these reactions failed. [(CH3)2TeCF3]I reacts with salts or acids to form many new derivatives of the composition [(CH3)2TeCF3]X (X = Cl, NO3, 1/2 SO4, OCOCH3, OCOCF3, B(C6H5)4, OC6H2(NO2)[3].
    Notes: Bei tiefer Temperatur unter Bestrahlung reagieren (CH3)2Te und CF3I zu [(CH3)2 TeCF3]I, das bei der thermischen Zersetzung oder in polaren Lösungsmitteln zu CH3TeCF3 und CH3I zerfällt. Die Bildung von Bis- bzw. Tris(trifluormethyl)tellur-Verbindungen gelingt bei diesen Reaktionen nicht. Durch Umsetzung von [(CH3)2TeCF3]I mit Salzen oder Säuren werden zahlreiche neue Derivate der Form [(CH3)2TeCF3]X synthetisiert X = Cl, NO3, 1/2 SO4, OCOCH3, OCOCF3, B(C6H5)4, OC6H2(NO2)3).
    Type of Medium: Electronic Resource
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  • 6
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    Unknown
    PANGAEA
    In:  Supplement to: Kuechly, Helga U; Kyba, Christopher C M; Ruhtz, Thomas; Lindemann, Carsten; Wolter, Christian; Fischer, Jürgen; Hölker, Franz (2012): Aerial survey and spatial analysis of sources of light pollution in Berlin, Germany. Remote Sensing of Environment, 126, 39-50, https://doi.org/10.1016/j.rse.2012.08.008
    Publication Date: 2023-01-13
    Description: Aerial observations of light pollution can fill an important gap between ground based surveys and nighttime satellite data. Terrestrially bound surveys are labor intensive and are generally limited to a small spatial extent, and while existing satellite data cover the whole world, they are limited to coarse resolution. This paper describes the production of a high resolution (1 m) mosaic image of the city of Berlin, Germany at night. The dataset is spatially analyzed to identify themajor sources of light pollution in the city based on urban land use data. An area-independent 'brightness factor' is introduced that allows direct comparison of the light emission from differently sized land use classes, and the percentage area with values above average brightness is calculated for each class. Using this methodology, lighting associated with streets has been found to be the dominant source of zenith directed light pollution (31.6%), although other land use classes have much higher average brightness. These results are compared with other urban light pollution quantification studies. The minimum resolution required for an analysis of this type is found to be near 10 m. Future applications of high resolution datasets such as this one could include: studies of the efficacy of light pollution mitigation measures, improved light pollution simulations, economic and energy use, the relationship between artificial light and ecological parameters (e.g. circadian rhythm, fitness, mate selection, species distributions, migration barriers and seasonal behavior), or the management of nightscapes. To encourage further scientific inquiry, the mosaic data is freely available at Pangaea.
    Keywords: AC; Aircraft; Berlin, Germany; File name; File size; Uniform resource locator/link to image; Verlust_der_Nacht
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
    Location Call Number Limitation Availability
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