Table of Contents
Laser Chemistry
Volume 19, Issue 1-4, Pages 353-356

Picosecond Raman Investigation of the Structure and Reactivity of 4,4′-Bipyridine in the S1 State

1Laboratoire de Spectrochimie Infrarouge et Raman (LASIR), UPR 2631, Centre d'Etudes et de Recherches Lasers et Applications, Université de Lille I, Bât C5, Villeneuve d'Ascq cedex 59655, France
2Laboratoire de Spectrochimie Infrarouge et Raman (LASIR), UPR 2631, 2 rue H. Dunant, Thiais 94320, France

Received 17 April 1997

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The lowest excited singlet state (S1) of 4,4′-bipyridine (44BPY) has been studied in water and methanol by using pump-probe time-resolved resonance Raman spectroscopy in the picosecond time domain. Spectroscopic evidence for a disymmetric S1 structure with localization of the electronic excitation in one of the two pyridyl rings is given. The fast formation of the N-hydro radical 44BPYH from the S1 state is clearly observed in methanol.