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  • Inorganic Chemistry  (2)
  • 41.60.−m  (1)
  • 1
    ISSN: 1434-601X
    Keywords: 41.50.th ; 41.60.−m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interference of transition radiation coherently produced from a periodic stack of four polyimide foils of 7.2 μm thickness and a separation of 162 μm was investigated. This stack has been brought into the low emittance (3 π nm rad) electron beam of the 855 MeV Mainz Microtron MAMI. Transition radiation was observed in the energy range from 2 to 15 keV with a LN2-cooled pin photodiode. A good energy resolution of 0.8 keV and angular resolution of 0.15 mrad was achieved simultaneously allowing for the first time to quantitatively study the interference pattern. Good agreement with theoretical calculations is found. Prospects to exploit transition radiation in the x-ray region from a low emittance electron beam as a high brilliant radiation source are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 362 (1968), S. 169-183 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bidentate ligands (L2) with sulfur and nitrogen donor-atoms split [Co(NO)2Br]2 and form diamagnetic, ionic compounds [Co(NO)2(L2)]+Br-. With diamine-ligands also hexafluorophosphates could be derived from these complexes. Tetramethylethylenediamine yields a salt [Co(NO)2(L2)]+[Co(NO)2Br2]-. Compounds with more acid bidentate ligands such as 2-amino-benzenethiol, 2-mercaptobenzothiazole and dithioethanediamide react with H2O to form HBr and nonionic complexes [Co(+)(NO)2(L2+)]°. Some paramagnetic dinitrosyliron compounds were also observed.Thiosalicylic acid and toluenedithiol yield binuclear complexes [(ON)2Co(+)(L2(2-1))Co(+)(NO)2], ethylenedithiol forms a polymer with similar structure. The complex containing, 1,4-dithiane [(ON)2BrCoS(CH2CH2)2SCoBr(NO)2] is also binuclear.The NO stretching frequencies are reported and discussed in relation to isotypic dinitrosyliron compounds(1). According to the NO-force constants the N=O bond strengths generally decrease from Co to Fe.
    Notes: Die Reaktion zweizähliger Liganden (L2) mit Schwefel- und Stickstoff-Donoratomen mit Dinitrosylkobaltbromid [Co(NO)2Br]2 führt unter Aufspaltung der Halogenbrücken zu diamagnetischen Kobalt-Stickoxid-Komplexen vom Typ [Co(NO)2(L2)]+Br-. Mit Diaminliganden konnten auch die entsprechenden Hexafluorophosphate erhalten werden. Tetramethyläthylendiamin bildet ein Salz mit Dinitrosylkobaltanion [Co(NO)2(L2)]+. [Co(NO)2Br2]-. Dinitrosylkobalt-Komplexe mit stärker sauren zweizähligen Liganden wie o-Aminothiophenol, 2-Mercaptobenzthiazol und Dithiooxamid gehen bei der Reaktion mit H2O unter HBr-Abspaltung in elektroneutrale, diamagnetische Verbindungen des Typs [Co(+)(NO)2(L2(-))]° über. Auch einige paramagnetische Dinitrosyleisen-Komplexe wurden nachgewiesen.Thiosalicylsäure und Toluoldithiol bilden mit [Co(NO)2Br]2 zweikernige Komplexe [(ON)2Co(+)(L2(2-))Co(+)(NO)2], Äthandithiol eine polymere Verbindung ähnlicher Struktur. Mit 1,4-Dithian erhält man den zweikernigen Komplex [(ON)2CoBrS(CH2CH2)2SCoBr(NO)2].Die NO-Valenzschwingungen der Verbindungen werden diskutiert und mit denen isotyper Dinitrosyleisen-Verbindungen(1) verglichen. Aus den NO-Valenzkraft-Konstanten geht hervor, daß der N=O-Bindungsgrad in den vorliegenden Komplexen von Co zu Fe abnimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 358 (1968), S. 271-281 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dimeric dinitrosylironbromide [Fe(NO)2Br]2 reacts with bidentate sulfur and nitrogen containing ligands (L2), such as various thioamides, 2-aminobenzenethiol, 2-mercaptobenzothiazole, tetramethylbiphosphinedisulfide, guanidine and certain diamines, yielding ionic, paramagnetic dinitrosyliron complex halides of the type [(ON)2Fe(L2)]+Br- and also compounds of the structure [(ON)2Fe(L2)2]+Br-. The first 2-aminobenzenethiol complex may be reduced with zinc to a diamagnetic compound [(ON)2FeHSC6H4NH2] and with Na-amalgam to a salt with the anion [(ON)2FeHSC6H4NH2]-. 1, 4—dithiane and [Fe(NO)2Br]2 form a binuclear nonionic compound Br(ON)2Fe(SC4H8S)Fe(NO)2Br. Thiosalicylic acid and the nitrosyl halide form a „Red ROUSSIN Ester“ [(ON)2FeSR]2 (R = C6H4COOH) with free carboxylic groups, evident through salt formation. The NO spectra are discussed.
    Notes: Dimeres Eisendinitrosylbromid [Fe(NO)2Br]2 bildet mit koordinativ zweizähligen S- und N-haltigen Liganden (L2), wie verschiedenen Thioamiden, o-Aminothiophenol, 2-Mercaptobenzthiazol, Tetramethylbisphosphindisulfid, Guanidin und gewissen Diaminen, paramagnetische Eisen - Stickoxid-Komplexe des Typs [(ON)2Fe(L2)]+Br-; ferner entstehen auch Verbindungen mit 2 Ligandenmolekülen [(ON)2Fe(L2)2]+Br-. Der o—Aminothiophenol-Komplex des ersten Typs kann mit Zink zur diamagnetischen, elektroneutralen Verbindung [(ON)2FeHSC6H4NH2], mit Na-amalgam zum Salz mit dem Anion [(ON)2 FeHSC6H4NH2]- reduziert werden. Mit 1, 4—Dithian und [Fe(NO)2Br]2 entsteht ein zweikerniger, nichtionogener Komplex Br(ON)2Fe(SC4H8S)Fe(NO)2Br. Thiosalicylsäure bildet mit dem Nitrosylhalogenid einen „Roten ROUSSINschen Ester“ [(ON)2FeSR]2 (R = C6H4COOH) mit freien Carboxylgruppen, die durch Salzbildung nachweisbar sind. Die NO-Spektren der Verbindungen werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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