A Highly Selective Fluorescent Indicator for Copper Based on a Boron Complex. (January 2015) - Zheng, Jie
Condensation of 4-(diethylamino)salicylaldehyde with aqueous hydrazine, followed by complexation with BF3 ·OEt2 gives a fluorescent indicator highly selective for copper. The indicator forms a 2 : 1 complex with Cu 2+ and displays a highly sensitive and selective fluorescent quenching action with Cu 2+ upon excitation at 440 nm in water/THF (7 : 3, v/v) solution. This action is pH-independent over the range 4.5 < pH < 9.5.