Abstract
A fluorescence “turn-off” and color “turn-on” probe for late IB metal ions (Fe3+/Co2+/Ni2+/Cu2+/Zn2+) was developed based on rhodamine B. The probe was synthesized by condensation between rhodamine B and 8-hydroxyjulolidine-9-carboxaldehyde, which provided excellent selectivity function for late IB metal ions detection. It binds Cu2+ in a 1:1 stoichiometry in acetonitrile solution. This probe displays distinct color and fluorescence change upon the addition of late IB metal ions and little interference with other biologically relevant metal ions. Limit of detection for Cu2+, Fe3+, and Co2+ is higher than that of Zn2+ and Ni2+. In addition, the limit of detection toward Cu2+ is about 312 times lower than the World Health Organization (WHO) recommended level in drinking water.
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