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  • 1
    ISSN: 1572-879X
    Keywords: Infrared spectroscopy ; DRIFT ; FT-IR ; CO adsorption ; Pt/K-LTL zeolitr ; iondipole interaction ; bifrunctional promotion ; water contamination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The adsorption of carbon monoxide on a non-acidic Pt/K-LTL catalyst has been studied by diffuse reflectance and transmission IR spectroscopy. The CO spectrum is strongly dependent on the experimental conditions. Adsorption on the small Pt clusters in the presence of water gives linear-CO bands between 2060 and 1990 cm−1 and a bridging-CO band around 1800 cm−1. In the absence of water, the linear bands are red shifted to about 1940 and 1720 cm−1, respectively. The frequency shift is attributed to an ion-dipole interaction between adsorbed CO and support cations. The ion-dipole interaction is screened by the adsorbed water leading to a smaller red shift in the CO stretching frequency.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 80-89 
    ISSN: 1618-2650
    Keywords: Strukturaufklärung von organ. Verbindungen ; Spektralphotometrie, IR ; Auswertungsschema, CHO-Verbindungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Generally, the structure elucidation of organic molecules by means of infrared spectroscopy is based on absorption frequencies in the region 4000-400/cm with an accuracy of 3–5/cm. The interpretation system presented here makes use of the regions 3110-2800/cm, 1850-1650/cm and 1500–1350/cm. An accuracy of ±0.5/cm and the use of CCl4 as a solvent is required. The system, based on logical yes/no decisions, provides information on structural elements present in a molecule; it is applicable to a number of CH and CHO compounds.
    Notes: Zusammenfassung Im allgemeinen beruht die Strukturauflösung organischer Moleküle mit Hilfe der Infrarotspektroskopie auf Absorptionsfrequenzen im Bereich 4000-400/cm mit einer Genauigkeit von 3–5/cm. Das hier beschriebene Auswertungsschema benutzt nur die Bereiche 3110-2800/cm, 1850-1650/cm und 1500-1350/cm; eine Genauigkeit von ±0,5/cm und der Gebrauch von CCl4 als Lösungsmittel sind dabei erforderlich. Das Schema, das auf logischen Ja/Nein-Entscheidungen beruht, informiert über die Strukturelemente eines Moleküls und eignet sich für eine Anzahl von CH- und CHO-Verbindungen.
    Type of Medium: Electronic Resource
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