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UV/Vis spectroscopic behaviour of some new hydroxy azocoumarin derivatives

UV/Vis-spektroskopisches Verhalten einiger neuer Hydroxyazocumarinderivate

  • Anorganische Und Physikalische Chemie
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Summary

The UV/Vis spectroscopic behaviour of six new hydroxy azocoumarin compounds in solution has been investigated. The observed bands are assigned to electronic transitions. Azocoumarin compounds exist mainly in the azo form, whereas 6-(2-hydroxy-6-aminonaphthyl-1-azo)-coumarin exhibits an azo-hydrazone tautomeric equilibrium. The solvatochromic behaviour of the azo compounds is investigated by studying their spectra in pure and mixed organic solvents of different characteristics. The longer wavelength band of the azocoumarins inDMF solution is assigned to an intermolecular CT transition.

Zusammenfassung

Das UV/Vis-spektroskopische Verhalten von sechs neuen Hydroxyazocumarinen in Lösung wurde untersucht. Die beobachteten Banden werden elektronischen Übergängen zugeordnet. Azocumarine liegen hauptsächlich in der Azoform vor, während 6-(2-Hydroxy-6-aminonaphthyl-1-azo)-cumarin eine Azo-Hydrazon-Tautomerie zeigt. Das solvatochrome Verhalten der Azoverbindungen wird durch Messung ihrer Spektren in reinen und gemischten organischen Lösungsmitteln mit unterschiedlichen Eigenschaften studiert. Die bei inDMF gelösten Azocumarinen auftretende langwellige Bande wird einem intermolekularen CT-Übergang zugeordnet.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, South Valley University, Sohag, Egypt

    A. M. Abdel-Mawgoud & H. M. Mostafa

  2. Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt

    M. M. Hamed

Authors
  1. A. M. Abdel-Mawgoud
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  2. M. M. Hamed
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  3. H. M. Mostafa
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Abdel-Mawgoud, A.M., Hamed, M.M. & Mostafa, H.M. UV/Vis spectroscopic behaviour of some new hydroxy azocoumarin derivatives. Monatsh Chem 128, 553–561 (1997). https://doi.org/10.1007/BF00807585

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  • DOI: https://doi.org/10.1007/BF00807585

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