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  • Inorganic Chemistry  (2)
  • Fourier transform infrared (FTIR) spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    In situ FTIR diagnostics of the radio-frequency plasma decomposition of N2O (1987)
    Springer
    Plasma chemistry and plasma processing 7 (1987), S. 379-394 
    Details
    ISSN: 1572-8986
    Keywords: Radio-frequency (rf) discharge ; gas-phase dissociation ; nitrous oxide ; infrared spectroscopy ; Fourier transform infrared (FTIR) spectroscopy ; rotational temperature ; plasma diagnostics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The decomposition of N2O in a 13.56-MHz parallel-plate system was studied usingin situ Fourier transform infrared (FTIR) spectroscopy. Areas of two infrared absorption bands of N2O recorded at 8 cm−1 resolution were used to estimate relative gas-phase dissociation as a function of rf power and flow rate at 500 mT. Flow rate was found to strongly affect band areas over the range of powers investigated (10–90 W). The effect of rf power on band areas diminished above 40 W, probably due to poor plasma confinement. Distortion of the band shapes by the plasma permitted rotational temperatures to be estimated. Rotational temperature increased essentially linearly with power at constant flow rate, reaching 450 K at 80 W, but was independent of flow rate at constant power. Rotational temperatures were also found to depend on the temperature of the electrodes, which were heated by plasma exposure. No infrared-active product species were observed even under batch conditions where all N2O was irreversibly dissociated. This lack of detectable products and a 50% pressure rise observed in a batch study suggest that N2 and O2 are the primary stable discharge products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030485
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  • 2
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Derivaten des Nickelkomplexes Ni(ONO) (ONO2- = Dianion einer dreizähnigen Schiffschen Base) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 589 (1990), S. 101-114 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure Studies on Derivatives of the Nickel Complex Ni(ONO) (ONO2- = Dianion of a Tridentate Schiff Base)The thermodynamically stable form of the solvent free, formally tri-coordinate complex Ni(ONO) (ONO2- = dianion of N-(2-hydroxyphenyl)-2-ethoxycarbonyl-3-ox(o-butene(1) amine(1)) as well as the mono adducts Ni(ONO)X with X = ammonia and X = diphenyl thiourea (DPT) have been characterized by X-ray structure analysis. In all cases the central atom is coordinated in a square-planar fashion, only for the adduct Ni(ONO)(DPT) a pyramidal distortion is observed which is due to the formation of hydrogen bonds. The solvent free form is a dimer [Ni(ONO)]2, and represents one of the few examples of dinuclear nickel complexes with a planar [NO3] coordination. The phenolic O-atoms act as bridging ligands. Due to their reduced π-donor strength the bond lengths Ni—O trans to the bridges are significantly shortened. In contrast to the analogous complex with an aliphatic bridge, “NiEIA”, both halves of the dimeric molecules are coplanar with a Ni—Ni distance of 3.29 Å.
    Notes: Die thermodynamisch stabile Form des solvensfreien, formal dreifach koordinierten Komplexes Ni(ONO) (ONO2- = Dianion des N-(2-Hydroxyphenyl)-2-ethoxycarbonyl-3-oxo-buten(1)-amin(1)) sowie die Monoaddukte Ni(ONO)X mit X = Ammoniak und Diphenylthioharnstoff (DPT) werden durch Röntgenstrukturanalyse charakterisiert. Das Zentralatom ist stets planarquadratisch koordiniert; nur das Addukt Ni(ONO)(DPT) zeigt eine durch die Ausbildung von Wasserstoffbrücken bedingte pyramidale Verzerrung. Die solvensfreie Form repräsentiert als Dimer [Ni(ONO)]2 eines der wenigen Beispiele dinuclearer Nickelkomplexe mit planarer NO3-Koordination. Als Brückenliganden wirken die Phenolatsauerstoffatome; aufgrund ihrer abgeschwächten π-Donorwirkung sind die transständigen Ni—O-Bindungen der Chelatsechsringe signifikant verkürzt. Im Gegensatz zum aliphatisch überbrückten Analogen „Ni(EIA)“ sind beide Molekülhälften coplanar mit einem Ni—Ni-Abstand von 3,29 Å angeordnet.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905890112
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  • 3
    Electronic Resource
    Electronic Resource
    Struktur und Reaktivität von Nickel(II)-Komplexen des Typs Ni(ONO)X (ONO = Dianion einer dreizähnigen Schiff-Base; X = einzähniger neutraler Ligand) im Vergleich zu Pd(ONO)X (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 577 (1989), S. 135-144 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Reactivity of Nickel(II) Complexes of the Type Ni(ONO)X (ONO = Di-anion of a Tridentate Schiff Base; X = Monodentate Neutral Ligand) as Compared to Pd(ONO)XThe four-coordinate chelate complexes Ni(ONO)(Lut), Pd(ONO)(PPh3), and Pd(ONO)(Lut) were prepared and characterized (ONO ≙ dianion of N-(2-hydroxyphenyl)-2-ethoxy-carbonyl-3-oxobutene(1)-amine(1); Lut = 2,6-dimethylpyridine). An X-ray structure analysis of Ni(ONO)(PPh3) and Ni(ONO)(Lut) was carried out according to which both complexes crystallize in the triclinic space group P1 with Z = 2. The coordination geometry for the nickel is practically square planar and the ring system of the lutidine in Ni(ONO)(Lut) is oriented perpendicular to the plane of coordination. Ligand substitution according to M(ONO)(PPh3) + Lut → M(ONO)(Lut) + PPh3 (M = Ni. Pd) was studied kinetically in acetone at 25°C. It follows the rate law -d[complex]/dt = kobs[complex] with kobs = k1 + k2[Lut]. The ratio of the second-order rate constants is found to be k2(Ni):k2(Pd) = 2.2 × 106:1.
    Notes: Die Chelatkomplexe Ni(ONO)(Lut), Pd(ONO)(PPh3) und Pd(ONO)(Lut) mit der Koordinationszahl 4 wurden dargestellt und charakterisiert (ONO ≙ Dianion von N-(2-Hydroxyphenyl))-2-ethoxycarbonyl-3-oxo-buten(1)-amin(1); (Lut = 2,6-Lutidin = 2,6-Dimethylpyridin). Eine Röntgenstrukturanalyse von Ni(ONO)(PPh3) und Ni(ONO)(Lut) wurde durchgeführt. Danach kristallisieren beide Komplexe in der triklinen Raumgruppe P1 mit Z = 2 und die Koordinationsgeometrie für das Nickel ist praktisch planar-quadratisch. In dem Komplex Ni(ONO)(Lut) steht das Ringsystem des Lutidins senkrecht zur Koordinationsebene. Die Ligandensubstitution M(ONO)(PPh3) + Lut → M(ONO()Lut) + PPh3 (M = Ni, Pd) in Aceton wurde bei 25°C kinetisch untersucht. Sie folgt dem Geschwindigkeitsgesetz -d[Komplex]/dt = kob3[Komplex] mit kob3 = k1 + k2[Lut]. Für das Verhältnis der Geschwindigkeitskonstanten zweiter Ordnung gilt k2(Ni): k2(Pd) = 2,2 · 106: 1.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895770115
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