Energy barrier to TTC-TTT isomerisation for the merocyanine of a photochromic spiropyran

Jonathan Hobley, Vincenzo Malatesta

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

The 1H NMR signal of a proton of a spiropyran photomerocyanine was resolved at low temperature into two signals attributed to the two isomers, TTT and TTC. The equilibrium distribution and free energy difference between the TTT and TTC isomers were calculated to be 0.15 and 4.6 ± 0.7 kJ mol-1, respectively. By 1H NMR lineshape analysis at various temperatures, an activation barrier for the TFC → TTT isomerisation of 43.6 ± 3 kJ mol-1 was calculated.

Original languageEnglish
Pages (from-to)57-59
Number of pages3
JournalPhysical Chemistry Chemical Physics
Volume2
Issue number1
DOIs
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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