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Chemistry of Heterocyclic Compounds

, Volume 10, Issue 4, pp 428–433 | Cite as

Benzazoles and naphthazoles

XXXVII. Structure and thermochromic properties of 1-benzothiazolyL-5-(p-nitrophenyl)formazans
  • G. N. Lipunova
  • N. N. Gulemina
  • A. P. Zeif
  • N. P. Bednyagina
Article
  • 24 Downloads

Abstract

1-Benzothiazolyl-5-(p-nitrophenyl)formazans, which have thermochromic properties, were synthesized. The structure of the compounds was studied by means of IR and UV spectroscopy and quantum-mechanical calculations, the state of the tautomeric equilibrium was established, and the most probable planar conformations of the formazans as a function of the character of the substituent in the 3-position of the formazan chain were found. It is shown that the thermochromism of these compounds in solution is related to dissociation of the hydrogen of the NH bond of the formazan grouping and that the deeply-colored thermally induced form is the anionic aci form.

Keywords

Hydrogen Spectroscopy Organic Chemistry Formazan Tautomeric Equilibrium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1975

Authors and Affiliations

  • G. N. Lipunova
    • 1
  • N. N. Gulemina
    • 1
  • A. P. Zeif
    • 1
  • N. P. Bednyagina
    • 1
  1. 1.S. M. Kirov Ural Polytechnic InstituteSverdlovsk

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