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Charge-transfer fluorescence of rigidly linked aniline—naphthalene donor—acceptor systems

✍ Scribed by Wolfgang Rettig; Roland Haag; Jakob Wirz

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
498 KB
Volume
180
Category
Article
ISSN
0009-2614

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✦ Synopsis

The bichromophoric compounds 1 and 2, a pair of isomers containing a naphthalene and an aniline moiety rigidly linked through an alicyclic spacer, exhibit intramolecular charge-transfer (CT) fluorescence which isstrongly affected by solvent polarity. The Coulomb attraction term is somewhat smaller in isomer 1; hence, the CT energy of 1 is intrinsically larger than that of 2.

This situation is reversed in highly polar solvents due to the increased salvation arising from the larger mepn distance of charge separation for 1. Comparison with solvatochromic shifts in the aniline-naphthalene exciplex leads to the conclusion that the average distance between donor and acceptor in polar intermolecular exciplexes is considerably larger than is commonly assumed.

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