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Spectroscopic Properties of Organic Azo Compounds
Author(s) -
Rau Hermann
Publication year - 1973
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.197302241
Subject(s) - absorption (acoustics) , wavelength , fluorescence , absorption band , photochemistry , absorption spectroscopy , chemistry , coupling (piping) , materials science , intensity (physics) , molecular physics , chemical physics , atomic physics , optoelectronics , optics , physics , metallurgy , composite material
Azo compounds are characterized by a low‐energy 1 (n,π * ) electronic state, which gives rise to a weak band at long wavelengths in the absorption spectrum. Coupling of this state with other low‐lying molecular states is responsible for the high intensity of the “azo band” compared to other forbidden transitions, for its lack of vibrational structure, and for the inability of nearly all organic azo compounds to fluoresce.