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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 1
BKCSDE 34(1)
January 20, 2013 

A New Rhodamine B Hydrazide Hydrazone Derivative for Colorimetric and Fluorescent “Off-On” Recognition of Copper(II) in Aqueous Media
Lijun Tang*, Jiaojiao Guo, Nannan Wang
Rhodamine B derivative, Copper(II) recognition, Fluorescent, Colorimetric
A new Rhodamine B hydrazide hydrazone 1 has been synthesized and investigated as a colorimetric and fluorescent “off-on” sensor for the recognition of Cu2+ in CH3CN/H2O (1:1, v/v, HEPES 10 mM, pH = 7.0) solution. Sensor 1 displayed highly selective, sensitive and rapid recognition behavior toward Cu2+ among a range of biologically and environmentally important metal ions. Sensor 1 bind Cu2+ via a 1:1 stoichiometry with an association constant of 1.92 × 106 M−1, and the detection limit is evaluated to be 7.96 × 10−8 M. The Cu2+ recognition event is reversible and is barely interfered by other coexisting metal ions.
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