Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The trans $\rightarrow$ cis Photoisomerization and Fluorescence of trans 1,2-Bispyrazylethylene: pH, Salt and Heavy Atom Effects

  • Shim, Sang-Chul (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Bong, Pill-Hoon (Department of Chemistry, Korea Advanced Institute of Science and Technology)
  • Published : 1986.02.20
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Abstract

The $trans{\rightarrow}cis$ photoisomerization and fluorescence of trans-1,2-bispyrazylethylene were investigated in various conditions. The quantum yields of the $trans{\rightarrow}cis$ photoisomerization and the fluorescence intensity of trans-1,2-bispyrazylethylene decrease on going from neutral to acidic or basic solutions. The quantum yields of photoisomerization, however, are little affected by changing the concentration of salt while the fluorescence intensity increases as the concentration of salt increases. pH and salt effects on the energy levels of $^1(n,\;{\pi}^*)\;and\;^1({\pi},\; {\pi}^*)$ states lead to opposing changes in photoisomerization and fluorescence quantum yields. The heavy atom effect on the fluorescence of 1,2-bispyrazylethylene was also investigated.

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