<p>We synthesized and studied an organoboron complex which has a three-dimensional A–D–A structure, <b>2BF</b><sub><b>2</b></sub>, and is composed of two dihydrodioxaborinine ring moieties linked by [2.2]paracyclophane. In solution, <b>2BF</b><sub><b>2</b></sub> exhibits dual fluorescence, with one band displaying solvatofluorochromism and the other not. Theoretical calculations revealed that the dual fluorescence of <b>2BF</b><sub><b>2</b></sub> derives from co exsistence of centrosymmetric and non-centrosymmetric conformers in the excited singlet state, which exhibit contrasting emission behaviors owing to their different symmetry characteristics and dipole moments.</p>

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A three-dimensional A–D–A structured, [2.2]paracyclophane linked organoboron complex displays masked dual fluorescence and solvatofluorochromism

  • Shun Irii,
  • Takuya Ogaki,
  • Yasunori Matsui,
  • Hiroshi Ikeda

摘要

We synthesized and studied an organoboron complex which has a three-dimensional A–D–A structure, 2BF2, and is composed of two dihydrodioxaborinine ring moieties linked by [2.2]paracyclophane. In solution, 2BF2 exhibits dual fluorescence, with one band displaying solvatofluorochromism and the other not. Theoretical calculations revealed that the dual fluorescence of 2BF2 derives from co exsistence of centrosymmetric and non-centrosymmetric conformers in the excited singlet state, which exhibit contrasting emission behaviors owing to their different symmetry characteristics and dipole moments.