New fluorescent rhodamine hydrazone chemosensor for Cu(II) with high selectivity and sensitivity

Yu Xiang, Aijun Tong, Peiyuan Jin, Yong Ju
Organic Letters 2006 June 22, 8 (13): 2863-6
[reaction: see text] A new fluorescent probe, salicylaldehyde rhodamine B hydrazone (1), was synthesized and displayed selective Cu(II)-amplified absorbance and fluorescence emission above 500 nm in neutral buffered media. Upon the addition of Cu(II), the spirolactam ring of 1 was opened and a 1:1 metal-ligand complex was formed. The detection of Cu(II) by 1 at a lower micromolar level was successful even in buffered water.

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