The possible tautomerism of the potential rotary switch 2-(2-(2-Hydroxy-4-nitrophenyl)hydrazono)-1-phenylbutane-1,3-dione

Silvia Hristova, Fadhil S. Kamounah, Nevse Molla, Poul Erik Hansen, Daniela Nedeltcheva, Liudmil Antonov

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review


The title compound is potentially tautomeric and its tautomerism was studied by means of molecular spectroscopy (1H and 13C NMR and UV–Vis) in DMSO as well as by quantum chemical calculations (M06-2X/TZVP). The detailed assignment of the NMR signals supported by the theoretical calculations clearly shows that the previous interpretation, available in the literature, about the coexistence of two tautomeric forms is not correct. The compound exists as major and minor isomer of a single tautomeric form. In addition, a 2-methoxy derivative (the OH group replaced by a methoxy group) is also investigated and show similar trends.
TidsskriftDyes and Pigments
Sider (fra-til)249-261
Antal sider13
StatusUdgivet - 2017


  • DFT calculations
  • UV
  • isotope effects
  • rotary switch
  • solvent effects

Citer dette