Premium
Study of the intramolecular charge‐transfer (ICT) process in 4‐dimethylamino‐4′‐ nitrostilbene by picosecond time‐resolved CARS
Author(s) -
Oberlé J.,
Abraham E.,
Jonusauskas G.,
Rullière C.
Publication year - 2000
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(200004)31:4<311::aid-jrs544>3.0.co;2-8
Subject(s) - intramolecular force , picosecond , chemistry , photochemistry , raman spectroscopy , acetonitrile , relaxation (psychology) , optics , stereochemistry , organic chemistry , laser , physics , psychology , social psychology
The intramolecular charge‐transfer (ICT) process of 4‐dimethylamino‐4′‐nitrostilbene (DNS) in solution was studied by pump–probe and transient CARS experiments with a 1 ps time resolution. Whereas pump–probe experiments give good evidence for the formation of an ICT state in polar solvents, CARS experiments support structural changes associated with the ICT process. In acetonitrile, a 37 cm −1 downshift of the NO 2 stretching mode can be explained by a structural change located on the acceptor NO 2 group and assigned to conformational relaxation of the ICT state. In toluene, such behavior is not observed correlated with the absence of ICT state stabilization in non‐polar solvents. Copyright © 2000 John Wiley & Sons, Ltd.