A Simple Benzimidazole Based Fluorescent Sensor for Ratiometric Recognition of Zn²⁺in Water

Abstract

A phenylbenzimidazole derivatized sensor (L) that behaves as a ratiometric fluorescent receptor for Zn 2+ 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 Zn 2+ , the emission intensity at 367 nm is decreased, concomitantly, a new emission band centered at 426 nm is developed, thus facilitates a ratiometric Zn 2+ sensing behavior. Sensor L binds Zn 2+ through a 1:1 binding stoichiometry with high selectivity over other metal cations. Sensor L displays a linear response to Zn 2+ concentration from 0 to 6.0 × 10 5 M, sensor L also exhibits high sensitivity to Zn 2+ with a detection limit of 3.31 × 10 7 M.

Design of a Highly Selective Benzimidazole-Based Derivative for Optical and Solid-State Detection of Zinc Ion

“…Fluorescent chemosensors for Zn 2+ include various classes of compounds, viz., di-2-picolylamine-based, quinoline-based, bipyridine-based, acyclic and cyclic polyamine-based, iminodiacetic acid-based, triazole-based, and Schiff base-based sensors . In addition, anthracene-based, fluorescein-based, , oxazoline-based, 1,10-phenanthroline-based, coumarin-based, , benzimidazole-based, , rhodamine-based, BINOL-based, pyrazoline-based, pyrene-based, , and porphyrin and corrole analogue-based , compounds have also been reported as fluorescent chemosensors for Zn 2+ . Generally, photoinduced electron transfer (PET)- and intermolecular charge transfer (ICT)-based mechanisms for the fluorescence signaling for Zn 2+ sensors have been observed .…”

A fluorescence chemosensor based on imidazo[1,2-a]quinoline for Al3+ and Zn2+ in respective solutions

“…11,12 In particular, molecular chemosensors that show uorescence responses upon selective binding with metal ions have received great interest because it is cost-effective, rapid, facile, and amenable to real time-monitoring. 13 In recent years, uorescent chemosensors for the detection of zinc [14][15][16][17][18][19][20] or aluminium ions [21][22][23][24] have been emerging continuously. However, most of the uorescence chemosensors are studied in single organic solvents such as THF, DMSO and EtOH.…”