The molecular design, synthesis and photochromic properties of spirooxazines containing a permanent azo (hydrazone) chromophore

Robert M Christie, Keith Miles Morgan, Ayesha Rasheed, Mohanad Aldib, Georgina Margaret Rosair

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9 Citations (Scopus)


A range of molecular modelling techniques has been applied to predict optimized geometrical conformations and energies of the ring-closed oxazine form and ring-opened merocyanine forms of three azospirooxazines. A comparison of the relative stabilities of the possible isomers of the merocyanines was carried out by applying molecular mechanics (augmented MM2), while the prediction of the potential for photochromic behaviour was made by comparison of the heats of formation calculated by AMI. Synthetic routes were explored and as a result two azospirooxazines were isolated, one of which showed interesting and unusual photochromic behaviour. The instability of this compound towards purification by chromatography was investigated. The decomposition product was isolated and characterized with the aid of single crystal x-ray crystallography. The correlation between predicted and observed photochromic behaviour is discussed. (C) 2013 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)263-272
Number of pages10
JournalDyes and Pigments
Issue number2
Publication statusPublished - Aug 2013


  • Photochromism
  • Spirooxazine
  • Azo
  • Hydrazone
  • Molecular modelling
  • Isosbestic point
  • PART 1
  • DYES

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