THE NATURE OF THE EXCITED-STATES OF PYRENE SUBSTITUTED BY N,N-DIMETHYLANILINE AND ACETOPHENONE

Authors
DOBKOWSKI J WALUK J
Citation
J. Dobkowski et J. Waluk, THE NATURE OF THE EXCITED-STATES OF PYRENE SUBSTITUTED BY N,N-DIMETHYLANILINE AND ACETOPHENONE, Polish Journal of Chemistry, 67(8), 1993, pp. 1389-1396
Citations number
16
Categorie Soggetti
Chemistry
Journal title
Polish Journal of Chemistry → ACNP
ISSN journal
01375083
Volume
67
Issue
8
Year of publication
1993
Pages
1389 - 1396
Database
ISI
SICI code
0137-5083(1993)67:8<1389:TNOTEO>2.0.ZU;2-4
Abstract
The large Stokes shift of the fluorescence of 4'-(1-Pyrenyl)-acetophen one and 4'-(1-Pyrenyl)-N,N-dimethylaniline observed in polar solvents indicates that a significant structural transformation takes place aft er excitation. There are two alternative interpretations of the experi mental facts: TICT state formation, or relaxation with a simultaneous twist of the donor and acceptor subgroups towards a co-planar geometry . The results of INDO/S calculations support the second mechanism.