Xu Zhicheng, Bai Guan, Dong Chuan
Department of Chemistry, Shanxi University, Taiyuan 030006, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Dec;62(4-5):987-90. doi: 10.1016/j.saa.2005.04.019.
The spectral and photophysical properties of a new intramolecular charge transfer (ICT) probe, namely 4'-dimethylamino-2,5-dihydroxychalcone (DMADHC) were studied in different solvents by using steady-state absorption and emission spectroscopy. Whereas the absorption spectrum undergoes minor change with increasing polarity of the solvents, the fluorescence spectrum experiences a distinct bathochromic shift in the band position and the fluorescence quantum yield increases reaching a maximum before decrease with increasing the solvent polarity. The magnitude of change in the dipole moment was calculated based on the Lippert-Mataga equation. These results give the evidence about the intramolecular charge transfer character in the emitting singlet state of this compound.
通过稳态吸收和发射光谱法，在不同溶剂中研究了一种新型分子内电荷转移（ICT）探针，即4'-二甲基氨基-2,5-二羟基查尔酮（DMADHC）的光谱和光物理性质。随着溶剂极性的增加，吸收光谱变化较小，而荧光光谱在谱带位置上经历明显的红移，并且荧光量子产率增加，在随着溶剂极性增加而降低之前达到最大值。基于Lippert-Mataga方程计算了偶极矩的变化量。这些结果为该化合物发射单重态的分子内电荷转移特性提供了证据。
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