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  • 1990-1994  (3)
  • Inorganic Chemistry  (2)
  • 42.60  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Saturated 2D-LIF of OH and 2D determination of effective collisional lifetimes in atmospheric pressure flames (1991)
    Springer
    Applied physics 52 (1991), S. 341-346 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 34.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Saturation of two-dimensional laser-induced fluorescence is demonstrated using the coincidence between the strong 0–0 vibrational transition of OH around 308 nm and the emission of a tunable XeCl excimer laser. The 2D images were insensitive to variations in the laser power, implying reduced sensitivity to quenching processes. The ratio of the 2D images in the linear and saturated regimes show two-dimensional variations in the saturation intensity. Since saturation intensity is proportional to the quenching rate, this novel method allows one to check for variations in collisional lifetimes across the flame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325493
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und dynamisches Verhalten von [Rh2(μ-H)3H2(PiPr3)4]+. Beiträge zur Reaktivität des Tetrahydridodirhodium-Komplexes [Rh2H4(PiPr3)4]Professor Wilhelm Preetz zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1157-1162 
    Details
    ISSN: 0044-2313
    Keywords: Hydridorhodium complexes ; reactions with CO and methanol ; synthesis of a carbonyl(methyl)rhodium(I) complex ; protonation reactions ; intramolecular rearrangement ; nitrosylrhodium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Dynamic Behaviour of [Rh2(μ-H)3H2(PiPr3)4]+. Contributions to the Reactivity of the Tetrahydridodirhodium Complex [Rh2H4(PiPr3)4]An improved synthesis of [Rh2H4(PiPr3)4] (2) from [Rh(η3-C3H5)(PiPr3)2] (1) or [Rh(η3-CH2C6H5)(PiPr3)2] (3) and H2 is described. Compound 2 reacts with CO or CH3OH to give trans-[RhH(CO)(PiPr3)2] (4) and with ethene/acetone to yield a mixture of 4 and trans-[RhCH3(CO)(PiPr3)2] (5). The carbonyl(methyl) complex 5 has also been prepared from trans-[RhCl(CO)(PiPr3)2] (6) and CH3MgI. Whereas the reaction of 2 with two parts of CF3CO2H leads to [RhH2(η2-O2CCF3) · (PiPr3)2] (8), treatment of 2 with one equivalent of CF3CO2H in presence of NH4PF6 gives the dinuclear compound [Rh2H5(PiPr3)4]PF6 (9a). The reactions of 2 with HBF4 and [NO]BF4 afford the complexes [Rh2H5(PiPr3)4]BF4 (9b) and trans-[RhF(NO)(PiPr3)2]BF4 (11), respectively. In solution, the cation [Rh2(μ-H)3H2(PiPr3)4]+ of the compounds 9a and 9b undergoes an intramolecular rearrangement in which the bridging hydrido and the phosphane ligands are involved.
    Notes: Es wird über eine verbesserte Synthese von [Rh2H4(PiPr3)4] (2) aus [Rh(η3-C3H5)(PiPr3)2] (1) oder [Rh(η3CH2C6H5)(PiPr3)2] (3) und H2 berichtet. Verbindung 2 reagiert mit CO oder CH3OH zu trans-[RhH(CO)(PiPr3)2] (4) und mit Ethen/Aceton zu einem Gemisch von 4 und trans-[RhCH3(CO) · (PiPr3)2] (5). Der Carbonyl(methyl)-Komplex 5 ist ebenfalls aus trans-[RhCl(CO)(PiPr3)2] (6) und CH3MgI erhältlich. Während die Reaktion von 2 mit zwei Teilen CF3CO2H zu [RhH2(η2O2CCF3)(PiPr3)2] (8) führt, entsteht aus 2 und einem Äquivalent CF3CO2H in Gegenwart von NH4PF6 die zweikernige Verbindung [Rh2H5(PiPr3)4]PF6 (9a). Die Umsetzungen von 2 mit HBF4 und [NO]BF4 liefern die Komplexsalze [Rh2H5(PiPr3)4]BF4 (9b) und trans-[RhF(NO)(PiPr3)2]BF4 (11). Das in den Verbindungen 9a und 9b vorliegende Kation [Rh2(μ-H)3H2(PiPr3)4]+ unterliegt in Lösung einer intramolekularen Umlagerung, in der die verbrückenden Hydridoliganden und die Phosphangruppen einbezogen sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200705
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  • 3
    Electronic Resource
    Electronic Resource
    Ionische Kronenetherkomplexe von Zinn(II) und Zinn(IV): [Sn(15-Krone-5)] [SnCl6] und [SnCl3(18-Krone-6)]2[Sn2Cl10]; Synthesen, IR-Spektren und 119Sn-Mößbauer-Spektren (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 615 (1992), S. 127-130 
    Details
    ISSN: 0044-2313
    Keywords: Ionic Crown Ether Complexes of Tin(II) and Tin(IV) ; synthesis ; IR spectra ; 119Sn-Mössbauer spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionic Crown Ether Complexes of Tin(II) and Tin(IV): [Sn(15-Crown-5)][SnCl6] and [SnCl3(18-Crown-6)]2[Sn2Cl10]; Syntheses, IR Spectra, and 119Sn-Mössbauer Spectra[Sn(15-crown-5)][SnCl6] (1,) has been prepared by the reaction of SnCl2, SnCl4, and 15-crown-5 in the molar ratio of 1 : 1 : 1 in acetonitrile solution, forming a white insoluble crystal powder. [SnCl3(18-crown-6)]2[Sn2Cl10] (2,) as well as [SnCl3(18-crown-6)][BiCl4] · CH3CN (3,) are prepared by the reaction of SnCl4 with 18-crown-6 (molar ratio 2 : 1), and of SnCl4, 18-crown-6, and BiCl3 (molar ratio 1 : 1 : 1), respectively. According to IR-spectroscopy and 119Sn-Mössbauer-spectroscopy 1-3, have ionic structures; the cation of 1, being polymeric via a sandwich-like structure.
    Notes: [Sn(15-Krone-5)] [SnCl6] (1,) entsteht als schwerlösliches weißes Kristallpulver aus SnCl2, SnCl4 und 15-Krone-5 im Molverhältnis 1 : 1 : 1 in Acetonitrillösung, während [SnCl3(18-Krone-6)]2[Sn2Cl10] (2,) aus SnCl4 und 18-Krone-6 im Molverhältnis 2 : 1 und [SnCl3(18-Krone-6)] [BiCl4] · CH3CN (3,) aus SnCl4, 18-Krone-6 und BiCl3 im Molverhältnis 1 : 1 : 1 gebildet werden. Aus den IR- und den 119Sn-Mößbauer-Spektren wird auf ionische Strukturen geschlossen; das Kation von 1, besitzt eine polymere Struktur, in der das Sn2+ -Ion über (15-Krone-5)-Moleküle sandwichartig gestapelt ist.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926150926
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