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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 2
BKCSDE 35(2)
February 20, 2014 

A Simple Benzimidazole Based Fluorescent Sensor for Ratiometric Recognition of Zn2+ in Water
Keli Zhong, Mingjun Cai, Shuhua Hou, Yanjiang Bian, Lijun Tang*
Zinc ion, Fluorescence, Ratiometric, Benzimidazole
A phenylbenzimidazole derivatized sensor (L) that behaves as a ratiometric fluorescent receptor for Zn2+ in water has been described. In HEPES buffer at pH 7.4, sensor L displays a weak fluorescence emission band at 367 nm. Upon addition of Zn2+, the emission intensity at 367 nm is decreased, concomitantly, a new emission band centered at 426 nm is developed, thus facilitates a ratiometric Zn2+ sensing behavior. Sensor L binds Zn2+ through a 1:1 binding stoichiometry with high selectivity over other metal cations. Sensor L displays a linear response to Zn2+ concentration from 0 to 6.0 × 105 M, sensor L also exhibits high sensitivity to Zn2+ with a detection limit of 3.31 × 107 M.
489 - 493
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