Triplet (T/sub 1/) state resonance Raman spectroscopy of some azanaphthalenes

Journal Article · Wed Apr 15 04:00:00 EDT 1987 · J. Chem. Phys.; (United States)

OSTI ID:6725415

Kessler, R J; Tripathi, G N.R.

The time-resolved T/sub n/reverse arrowT/sub 1/ resonance Raman spectra of quinoline (1-azanaphthalene), isoquinoline (2-azanaphthalene), quinoxaline (1,4-diazanaphthalene), and quinazoline (1,3-diazanaphthalene) molecules in cyclohexane solution are reported, and vibrational assignments and structural implications are discussed. In each of the four compounds, the most resonance enhanced Raman band lies in the 1340-1270 cm/sup -1/ region and corresponds to nuclear displacements involving in-plane stretching motions of the CC and CN bonds. In diazanaphthalenes, drop in the frequency of this vibration on S/sub 0/ to T/sub 1/ excitation (97 cm/sup -1/ in quinoxaline, 76 cm/sup -1/ in quinazoline) is observed to be higher than in azanaphthalenes (31 cm/sup -1/ in quinoline, 58 cm/sup -1/ in isoquinoline) implying pronounced elongation of the CN bonds, in comparison to the CC bonds, in the T/sub 1/ states. The T/sub 1/ Raman spectra of azanaphthalenes, in contrast to naphthalene, are observed to exhibit significant solvent dependency.

• Research Organization: Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556
• OSTI ID: 6725415
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 86:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
AROMATICS
AZAARENES
AZINES
CYCLOALKANES
CYCLOHEXANE
DISPERSIONS
ELECTRONIC STRUCTURE
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
QUINOLINES
RAMAN SPECTRA
RESONANCE
SOLUTIONS
SPECTRA