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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 11
BKCSDE 31(11)
November 20, 2010 

A New Rhodamine B Derivative As a Colorimetric Chemosensor for Recognition of Copper(II) Ion
Lijun Tang*, Fangfang Li, Minghui Liu, Raju Nandhakumar*,
Colorimetric, Chemosensor, Rhodamine B, Copper recognition
A new rhodamine-based sensor 1 was designed and synthesized by incorporating rhodamine B and benzimidazole moieties. Sensor 1 exhibits high selectivity and sensitivity to Cu2+ in CH3CN-water solution (HEPES buffer, pH = 7.0) with an obvious color change from colorless to pink. Other metal ions such as Hg2+, Ag+, Pb2+, Sr2+, Ba2+, Cd2+, Ni2+, Co2+, Fe2+, Mn2+, Cu2+, Zn2+, Ce3+, Mg2+, K+ and Na+ had no such color change and have no significant influence on Cu2+ recognition process. The interaction of Cu2+ and sensor 1 was proven to adopt a 1:1 binding stoichiometry and the recognition process is reversible.
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