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The S0 and S1 methyl group torsional barriers in 2-methyl-1-naphthol depend upon the orientation of the OH group

✍ Scribed by Xue-Qing Tan; David W. Pratt

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
270 KB
Volume
207
Category
Article
ISSN
0009-2614

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✦ Synopsis

The two OH rotamers of 2-methyl-1-naphthol, syn-2M 1 HN and anti-2M 1 J-IN, have different CH, torsional barriers in both their ground and first excited electronic states, as revealed by high-resolution laser studies of their S,+S, fluorescence excitation spectra in a molecular beam. A comparison of the measured barriers with the results of ab initio calculations suggests that a primary factor responsible for these differences is a difference in the magnitudes of the repulsive steric interactions of the hydra gen and oxygen atoms of the OH group with the eclipsed hydrogen of the CHI group.

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