A selective fluorescent probe for relay recognition of Al3+ and Cu2+ through fluorescence "off-on-off" functionality

作者：Zhao, Jinyao; Zhao, Yukai; Xu, Shuai; Luo, Ningzi; Tang, Ruiren^*

来源：Inorganica Chimica Acta, 2015, 438: 105-111.

DOI：10.1016/j.ica.2015.09.007

• Flavone-based
• Fluorescent probe
• Relay recognition
• Al3+
• Cu2+
• "off-on-off" mechanism

A new 3-hydroxylflavone-based fluorescent probe N'-(3-(3-hydroxy-4-oxo-4H-chromen-2-yl)benzylidene)picolinohydrazide (1) with two different binding sites, 3-hydroxy-4-keto (site 1) and 2-picolinyl hydrazide (site 2), has been designed and synthesized. It shows highly selective relay recognition of Al3+ and Cu2+ via a fluorescence "off-on-off" mechanism. In DMSO-H2O (1:9, v/v) solution, probe 1 displays highly selective response to Al3+ with remarkable emission enhancement through its binding of Al3+ to site 1. Moreover, the in situ system generated from the sensing of Al3+ demonstrates eminent relay recognition of Cu2+ via a fluorescence quenching through its binding of Cu2+ to site 2. These proposed binding modes are also proved by H-1 NMR titration. The detection limits for Al3+ and Cu2+ are calculated to be 21.7 mu M and 0.95 mu M, respectively.

• 出版日期2015-11-1
• 单位中南大学