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A three-dimensional A-D-A structured, [2.2]paracyclophane linked organoboron complex displays masked dual
Shun Irii1, Takuya Ogaki2,3, Yasunori Matsui1,4
1Department of Applied Chemistry, Graduate School of Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
Abstract:
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.
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