Untersuchungen zum UV/VIS-Spektralverhalten von Azofarbstoffen. IIIEmpirische, an Azobenzenen gewonnene Absorptionsinkremente und ihre Beziehungen zu Reaktivitätskonstanten, spektroskopischen Substituentenkonstanten und Ionisierungspotentialen
✍ Scribed by H. Mustroph; Dr. sc. J. Epperlein
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 294 KB
- Volume
- 322
- Category
- Article
- ISSN
- 1615-4150
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✦ Synopsis
Studies on UV/VIS Absorption Spectra of Azo Dyes. III. Empirical Absorption Increments Derived from Azobenzenes and their Relationship to Reactivity Constants, Spectroscopic Substituent Constants and Ionisation Potentials
Absorption increments ϵ which specifically characterize the substituents are derived from the difference in exitation energy between azobenzene and monosubstituted azobenzenes. These increments have been found to predict accurately the effect of substituents of the long wave π → π^*^ band of polysubstituted azobenzenes.
Comparison of the ϵ values with HAMMETT‐σ reactivity constants reveals direct proportionality between the two sets of constants. There is also a direct proportionality between the increments and spectroscopic substituent constants introduced by BLOOR and COPLEY. Furthermore, a correlation of the ϵ values with the ionization potentials of substituents was found.