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An OFF−OFF−ON Fluorescence Sensor for Metal Ions in Stepwise Complex Formation of 2,3,5,6-Tetrakis(2-pyridyl)pyrazine with Metal Ions

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journal contribution
posted on 20.12.2006, 00:00 by Junpei Yuasa, Shunichi Fukuzumi
The fluorescence intensity of 2,3,5,6-tetrakis(2-pyridyl)pyrazine (TPPZ) begins to increase at concentrations of metal ions (Mn+) above the 1:2 ratio of metal ion concentration to the initial concentration of TPPZ ([Mn+]/[TPPZ]0 > 0.5), when a 2:1 complex of TPPZ with Mn+ [(TPPZ)2−Mn+] is converted to a 1:1 complex of TPPZ with Mn+ (TPPZ−Mn+), which exhibits strong fluorescence.