Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 35

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPhotoChem, ChemPlusChem, Zeitschrift für Chemie

Cover Picture (Angew. Chem. Int. Ed. Engl. 8/1993)

32_08/1993The cover picture refers to the Nobel review by R. A. Marcus on pages 1111–1121. The simplest chemical reaction—self-exchange electron transfer—is illustrated in the lower region with the reaction between green MnO42− and violet MnO4, which in water occurs approximately 100 000 times per second. The potential function in the upper region illustrates a central point of the Marcus theory on the relation between the rate of an electron transfer reaction and its exothermicity: in very exothermic reactions an inverse region can occur, in which an increase of the free energy E correlates with a decrease in the reaction rate, that is, an increase in Ea. The pictures are taken from a poster, which was published by the Royal Swedish Academy of Science on conferment of the Nobel Prize in Chemistry.

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