期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 19, 页码 7231-7237出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201500033
关键词
aggregation-induced emission; boron; heterocycles; mechanochromism; thermochromism
资金
- Tokuyama Science Foundation
- Japan Science and Technology Agency (JST)
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [2401, 24102013]
We report a series of mechanofluorochromic (MFC) compounds based on organoboron complexes with aggregation-induced emission (AIE) characteristics. We synthesized a variety of boron ketoiminates and investigated the effect of the substituents on the optical properties by altering the end groups in the compounds. The synthesized boron ketoiminates showed AIE properties and MFC behavior. Interestingly, the hypsochromic and bathochromic shifts of the emission bands individually observed for boron ketoiminates depended on the chemical structures of the end groups. From the X-ray diffraction and differential scanning calorimetry analyses, it was confirmed that the MFC property of boron ketoiminates should be derived from a phase transition between crystalline and amorphous states. In addition, the direction of the peak shifts of the emission bands was controlled by the degree of steric hindrance of the end group.
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