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  • 1980-1984  (4)
  • 1945-1949  (1)
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  • 1
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract С помощью метода ИК спектроскопии следили за образованием изоцианата из CO и NH3 на катализаторах Rh/Al2O3 и Rh/NaY. Изоцианат образуется также за счет реакции CO с координационно связанным аммиаком в виде [Rh(NH3)5Cl]2+/NaY.
    Notes: Abstract The formation of isocyanate from CO and NH3 on Rh/Al2O3 and Rh/NaY catalysts under various conditions was obtained using IR-transmission spectroscopy. Isocyanate is also formed by the reaction of CO with NH3 coordinatively bound as [Rh(NH3)5Cl]2+NaY.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract CO реагирует с Rh(III), нанесенном на MgO и ZnO при повышенных температурах (〉373 К), образуя геминальные дикарбонильные частицы Rh(CO)2 на поверхности. После восстановления водородом при 743 и 473 К, соответственно, доминирующими адсорбированными формами являются линейные и мостиковосвязанные CO на больших кристаллитах Rh. Это находится в пр=qoтивоположности с Rh на других носителях, таких как Al2O3, SiO2 и т.д.
    Notes: Abstract CO reacts with Rh(III) supported on MgO and ZnO at elevated temperatures (〉373 K) to form the gem-dicarbonyl species Rh(CO)2 on the surface. After reduction with hydrogen at 743 and 473 K, respectively, the dominant adsorption forms are the linear and bridge bonded CO on larger Rh-crystallites. This is in contrast to Rh on other supports such as Al2O3, SiO2, etc.
    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: Electronic Structure of Rh4(CO)12, a Model for Linear- and Bridge-bonded CO on Rhodium CatalystsThe electronic structure of the Rh4(CO)12 cluster containing both linear- and bridgebonded CO groups has been studied by the EHMO method and compared with that of the Ir4(CO)12 cluster with only linear-bonded CO ligands. The charge distribution shows a distinctly higher π-back donation for the bridge-bonded CO groups. This result is compared with experimental data such as bond lengths, force constants of the C—O stretching frequencies and XPS data. It allows further an interpretation of results of CO hydrogenation on supported rhodium catalysts and on rhodium model complexes.
    Notes: Die Elektronenstruktur des Clusters Rh4(CO)12, der sowohl linear als auch brückenförmig gebundene CO-Gruppen enthält, wurde im Rahmen der EHMO-Methode untersucht und mit der des Ir4(CO)12-Clusters, der nur linear gebundene Liganden aufweist, verglichen. Die ermittelte Elektronendichteverteilung weist für die brückenförmig gebundenen CO-Liganden eine deutlich höhere π-Rückbindung auf. Dieser Befund wird mit experimentellen Daten wie Bindungslängen, Kraftkonstanten der CO-Valenzschwingung und XPS-Werten verglichen. Er gestattet ferner eine Interpretation von Ergebnissen der CO-Hydrierung an Rhodiumträgerkatalysatoren sowie an Rh-Modellkomplexen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electronic Structure of Structural Open Derivatives of the [Mo6X14]2--Cluster: [Mo5Cl13]2- and [Mo4I11]2-The electronic structure of structural open derivatives of the [Mo6X14]2--cluster [Mo5Cl13]2- and [Mo4I11]2- has been studied by the EHMO method. In [Mo5Cl13]2- 9 occupied MO's with dominant Mo4d character are responsible for the formation of the 8 metal-metal bonds. In [Mo4I11]2- the stronger covalent character of the Mo—I bonds affects the localization and the energy of molecular orbitals and also the charge distribution. The metal-metal bonds are formed by 8 MO's containing considerable participation of halogen AO's contrary to the chloride cluster. There is no bonding between the Mo atoms at the wing tips of the Mo4 butterfly and the reason for decreasing the dihedral angle between the Mo3 planes in [Mo4I11]2- compared with the octahedral angle is apparently the stabilization of the whole system (Mo—Mo and Mo—I bonds). The unpaired electron occupies in both clusters a slightly antibonding (with regard to the Mo—Mo bonds) orbital.
    Notes: Die Elektronenstruktur der strukturell offenen Derivate des [Mo6X14]2--Clusters [Mo5Cl13]2- und [Mo4I11]2- wurde mit Hilfe der EHMO-Methode untersucht. Im [Mo5Cl13]2- sind 9 besetzte MO mit überwiegend Mo4d-Charakter für die Ausbildung der 8 Metall-Metall-Bindungen verantwortlich. Im [Mo4I11]2- wirkt sich der stärker kovalente Charakter der Mo—I-Bindungen auf die Zusammensetzung der Molekülorbitale, deren energetische Lage sowie auf die Ladungsverteilung aus. Zur Ausbildung der Metall-Metall-Bindungen tragen 8 MO bei, die im Unterschied zum Chlorid-Cluster beträchtliche Halogen-Anteile enthalten. Eine Bindung zwischen den Mo-Atomen an den „Flügelspitzen“ der Mo4-„butterfly“-Struktur besteht offenbar nicht. Die Ursache für die Verringerung des Diederwinkels zwischen den Mo3-Flächen im Vergleich zum Oktaeder ist vielmehr in der Stabilisierung des gesamten Systems (Mo—Mo- und Mo—I-Bindungen) zu suchen. Das ungepaarte Elektron besetzt in beiden Clustern ein bezüglich der Mo—Mo-Bindungen schwach antibindendes Orbital.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 21 (1949), S. 452-452 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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