Abstract
The diffuse absorption bands of HON14O, HON16O, DON16O, and DON15O in the near ultraviolet have been examined. Transitions from both rotational isomers of nitrous acid contribute to the vibrational structure, with the excited state σ(N=O) stretching vibrations active in the most intense progressions. The cis–trans energy separation increases from 500 cal/mole in the ground state to 1200 cal/mole in the upper state. This is attributed to weakening of the internal hydrogen bond in the cis state upon an electronic promotion of primarily nO → π* type. The accompanying change in geometry is responsible for the appearance of the cis ground-state δ(ONO) bending mode in the spectrum.
Publisher
Canadian Science Publishing
Subject
Organic Chemistry,General Chemistry,Catalysis
Cited by
82 articles.
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