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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurde die Bildungsgeschwindigkeit von [Cr(NH3)5(OAc)]2+ (OAc = Acetat) aus [Cr(NH3)5(OH2)]3+ in Acetat-Pufferlösung untersucht. Die Reaktion läuft nach zwei Konkurrenzwegen ab, wovon einer OAc--unabhängig ist, und der andere in bezug auf die OAc--Konzentration nach erster Ordnung verläuft. Es wurden die jeweiligen Geschwindigkeitskonstanten und Aktivierungsgrößen, ΔH≠ und ΔS≠, ermittelt. Die OAc--unabhängige Reaktion scheint nach SN1 abzulaufen, die andere nach einem SN1 IP Mechanismus. Ionenpaarbildung ist angezeigt.
    Notes: The rate of formation of the acetatopentamminechromium(III)ion from the aquopentammine complex in HOAc—NaOAc buffer media has been investigated spectrophotometrically. The results suggest that the reaction occurs by two concurrent paths one of which is independent of acetate ion while the other is first order with respect to acetate ion concentration. The values of the rate constants for both the steps and the corresponding activation parameters, ΔH≠ and ΔS≠, have been evaluated. The results are consistent with an SN1 mechanism for the acetate independent path and an SN1 IP mechanism for the acetate dependent path. Evidence for ion-pair formation is given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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