Get Advances in Catalysis, Vol. 14 PDF

By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

ISBN-10: 0120078147

ISBN-13: 9780120078141

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Extra info for Advances in Catalysis, Vol. 14

Sample text

In a free radical crystal every one of the highest occupied orbitals is singly occupied, and in order to move an electron [as in process (3), Fig. 141 one would have to doubly occupy ACCEPTOR LAYER A A‘ A NARROW CONWIGTON BAND DONOR LAYER D O+ D NARROW CONDUCTION BAND NEUTRAL FREE RADICAL R R R FIG. 14. Charge migration in a molecular lattice. Schematic representation of donor and acceptor molecules and ions imbedded in a donor layer or an acceptor layer, respectively. From this diagram it is clear that process ( l ) ,the transfer of an electron from an acceptor negative ion to a neutral neighbor, produces a state of the system which is energetically identical with the initial state.

This last situation would correspond to the completely filled free radical system aa in process (3) above. 22 MELVIN CALVIN one orbital and vacate another, and there would have to be a different intermediate state than in the top two systems. This case, as represented by the upper two diagrams of Fig. 14, is what automatically appears in the donor-acceptor two phase systems. Quite recently this notion was dramatically illustrated by the report of the electrical properties of some complexes made from relatives of tetracyanoethylene, namely, tetracyanoquinodimethane (TCNQ) (3638).

And Murchio, J. , Biochem. Biophys. Research Commum. 4, 271 (1961). 74. , Perspectives in Biol. and Med. 5, 147 (1962). The Catalytic Decomposition of Formic Acid P. MARS, J. J. F. SCHOLTEN, AND P. ZWIETERING Central Laboratory Staatsniijnen in Limburg, Qeleen, Netherlands I. ntroduction ........................................................ 5 11. General Aspects of the Reaction. 38 111. Dehydrogenation of Formic Acid.. 39 39 A. Dehydrogenation on Metals.. B. Dehydrogenation on Metal Alloys.

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Advances in Catalysis, Vol. 14 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)


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