Elektronenstruktur und physikalisch‐chemische Eigenschaften von Azo‐Verbindungen Teil V: Über den Einfluss von Substituenten auf das Absorptions‐Spektrum des Phenyl‐azo‐azulens, ein Beitrag zur Kenntnis der PLATTNER'schen Verschiebungsregel
Authors:
- 1 January 1959
- journal article
- research article
- Published by Wiley in Helvetica Chimica Acta
- Vol. 42 (6) , 1877-1908
Abstract
It is shown that for phenyl‐azo‐azulenes substituted in the benzene nucleus the position ṼB.Iof the band corresponding to the long‐wave transition depends linearly on the Hammett σxvalue of the substituent X the shift ΔṼB.IIof the intense π→π* transition at 24 000 cm−1on protonation of the azo link depends linearly on σx, provided that σx‐ σ′xis negative.Keywords
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