Benzothiaoline Three-Coordinated Organoboron Compounds with a B鈺怤 Bond: Dual Emission and Temperature-Dependent Excimer Fluorescence
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- 作者：Soren K. Mellerup ; Suning Wang
- 刊名：Organometallics
- 出版年：2014
- 出版时间：October 13, 2014
- 年：2014
- 卷：33
- 期：19
- 页码：5483-5491
- 全文大小：564K
- ISSN：1520-6041
文摘
A series of 2,2-disubstituted benzothiazoline-BMes2 (Mes = mesityl) compounds containing a B鈺怤 bond have been prepared and fully characterized. Their photophysical properties were investigated by UV鈥搗is and fluorescence spectroscopy, which revealed the presence of solvent- and concentration-dependent dual emission. On the basis of the spectroscopic data, the dual emission was assigned to monomer and excimer fluorescence of the molecule, respectively. Experimental and TD-DFT computational data indicated that the purple-blue monomer emission of these compounds is mainly from an intramolecular charge transfer (CT) transition between the benzo-sulfur moiety and the boron center. The yellow-green excimer emission is attributed to intermolecular interactions involving the benzo-sulfur unit. Furthermore, the excimer emission maxima of all compounds were found to be sensitive to temperature, shifting to lower energy with decreasing temperature, which illustrates the potential for this class of compounds to be used as luminescent thermometers.