Abstract
Nanosecond time-resolved resonance Raman spectra of the T1 states and Raman spectra of the S0 states of 1-bromonaphthalene and 1,4-dibromonaphthalene were measured. Ab initio calculations were also performed to determine the optimized geometries and vibrational spectra for the S0 and T1 states of 1-bromonaphthalene and 1,4-dibromonaphthalene were predicted. The results were compared with those previously found for 2-bromonaphthalene and it was found that the Br atom substitution position and number both affect the changes in the C— Br bond in the T1 and Tn states. The intensities of the time-resolved resonance Raman spectra indicate that the C— Br bond changes its structure much more in the Tn state relative to the T1 state of 2-bromonaphthalene than 1-bromonaphthalene or 1,4-dibromonaphthalene. Possible implications of these substitution position effects on the ‘reluctant’ bond cleavage processes occurring from the Tn states of bromonaphthalenes are discussed. Copyright © 2000 John Wiley & Sons, Ltd.
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