A spiropyran is a type of organic chemical compound, known for photochromic properties that provide this molecule with the ability of being used in medical and technological areas. Spiropyrans were discovered in the early twentieth century. However, it was in the middle twenties when Fisher and Hirshbergin observed their photochromic characteristics and reversible reaction. In 1952, Fisher and co-workers announced for the first time photochromism in spiropyrans. Since then, there have been many studies on photochromic compounds that have continued up to the present.

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  • Spiropyrány jsou termální reverzibilní fotochromické přepínače , které se pod vlivem tepla vracejí do jejich původní formy (nitrospiropyrány dávají zpětnou reakci ve tmě již v průběhu 10 minut při pokojové teplotě). Spiropyránová forma (SP) sloučeniny je bezbarvá na rozdíl od merokyanínové formy (MC), která je barevná. Při izomerizací jde o elektronové přeskupení a vytvoření konjugovaného systému. "Spiro" uhlík v sp3- hybridizaci prochází díky přesunu π elektronů na uhlík v sp2-hybridizaci, který má v prostoru planární uspořádání. Po ozáření světlem vazba mezi "spiro" uhlíkem a kyslíkem zanikne, kruh se otevře a dojde k rotaci aromatické benzenové části. (cs)
  • A spiropyran is a type of organic chemical compound, known for photochromic properties that provide this molecule with the ability of being used in medical and technological areas. Spiropyrans were discovered in the early twentieth century. However, it was in the middle twenties when Fisher and Hirshbergin observed their photochromic characteristics and reversible reaction. In 1952, Fisher and co-workers announced for the first time photochromism in spiropyrans. Since then, there have been many studies on photochromic compounds that have continued up to the present. (en)
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  • A spiropyran is a type of organic chemical compound, known for photochromic properties that provide this molecule with the ability of being used in medical and technological areas. Spiropyrans were discovered in the early twentieth century. However, it was in the middle twenties when Fisher and Hirshbergin observed their photochromic characteristics and reversible reaction. In 1952, Fisher and co-workers announced for the first time photochromism in spiropyrans. Since then, there have been many studies on photochromic compounds that have continued up to the present. (en)
  • Spiropyrány jsou termální reverzibilní fotochromické přepínače , které se pod vlivem tepla vracejí do jejich původní formy (nitrospiropyrány dávají zpětnou reakci ve tmě již v průběhu 10 minut při pokojové teplotě). (cs)
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  • Spiropyran (cs)
  • Spiropyran (en)
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