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