A new pH fluorescent molecular switch by modulation of twisted intramolecular charge transfer with protonation

作者：Shen, Ping; Xiao, Shuzhang; Zhan, Xuqin; Zhang, Wei; Chang, Kedi; Yang, Changying^*

来源：Journal of Physical Organic Chemistry, 2013, 26(10): 858-862.

DOI：10.1002/poc.3185

• BOPIM-dma
• twisted intramolecular charge transfer
• protonation
• fluorescence emission
• switch on

A pH fluorescent molecular switch, BOPIM-dma, a boron 2-(2-pyridyl) imidazole complex derivatives, was investigated in aqueous system. BOPIM-dma shows weak or no fluorescence in conventional solvents due to twisted intramolecular charge transfer (TICT). Upon protonation of the dimethylamino groups in BOPIM-dma, its fluorescence was turned on ascribed to the inhibition of TICT. Its emission can be switched on' or off' between pH 2.4 and 4.0, and it undergoes a reversible protonation-deprotonation reaction with a pKa of 3.12.

• 出版日期2013-10
• 单位三峡大学