A determination of the structure of the intramolecular charge transfer state of 4-dimethylaminobenzonitrile (DMABN) by time-resolved resonance Raman spectroscopy

Authors
Kwok, WM Ma, C Matousek, P Parker, AW Phillips, D Toner, WT Towrie, M Umapathy, S
Citation
Wm. Kwok et al., A determination of the structure of the intramolecular charge transfer state of 4-dimethylaminobenzonitrile (DMABN) by time-resolved resonance Raman spectroscopy, J PHYS CH A, 105(6), 2001, pp. 984-990
Citations number
40
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY A
ISSN journal
10895639 → ACNP
Volume
105
Issue
6
Year of publication
2001
Pages
984 - 990
Database
ISI
SICI code
1089-5639(20010215)105:6<984:ADOTSO>2.0.ZU;2-M
Abstract
Picosecond time-resolved resonance Raman spectra of the A (intramolecular c harge transfer, ICT) state of DMABN, DMABN-d(6) and DMABN-N-15 have been ob tained. The isotopic shifts identify the nu (s)(ph-N) mode as a band at 128 1 cm(-1). The similar to 96 cm(-1) downshift of this mode from its ground s tate frequency rules out the electronic coupling PICT model and unequivocal ly supports the electronic decoupling TICT model. However, our results sugg est some pyramidal character of the A state amino conformation.