Untersuchungen zum UV/Vis-Spektralverhalten von Azofarbstoffen. V [16]. Quantitative Beschreibung der Absorptionsmaxima mehrfach substituierter Azobenzene mit einem Inkrementsystem

✍ Scribed by Dipl.-Chem. H. Mustroph; Dr. sc. J. Epperlein

• Publisher: John Wiley and Sons
• Year: 1981
• Tongue: English
• Weight: 899 KB
• Volume: 323
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/prac.19813230508

✦ Synopsis

Studies on U.V./vis Absorption Spectra of Azo Dyes. V. Quantitative Prediction of the Absorption Maxima of Polysubstituted Azobenzenes with an Increment System

The effect of substituents on the long‐wave band of azobenzenes can be described by using an increment system. Absorption increments which specifically characterize the substituents are derived from the difference in excitation energy between azobenzene and monosubstituted azobenzenes. Analysis of about 350 polysubstituted azobenzenes with absorption maxima between 320 nm and 650 nm showed that the differences between observed and calculated values are generally ±5 nm.

Therefore, this increment system permits absorption maxima of azobenzenes to be deduced not as yet prepared or spectroscopically investigated.