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Nuclear-Spin Polarization in Electron-Transfer Reactions of Amines

✍ Scribed by Heinz D. Roth

Publisher
John Wiley and Sons
Year
2006
Tongue
German
Weight
137 KB
Volume
89
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Chemically induced dynamic nuclear polarization (CIDNP) observed during electron transfer (ET) reactions of tertiary amines such as DABCO (1) or Et~3~N (2) with a wide range of electron acceptors support the involvement of amine radical‐cations (e.g., 1^.^^+^ or 2^.^^+^) as key intermediates. Radical ions such as 2^.^^+^ may be deprotonated, generating neutral aminoalkyl radicals (e.g., 2^.^). When generated by reaction with an electron acceptor of energetically low triplet state such as naphthalene (^1^Naph*), the resulting pair 2^.^^+^/Naph^.−^ reacts mostly by reverse electron transfer (RET) from triplet pairs populating the naphthalene triplet state.

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