Highly selective probe based on imine linkage for Zn2+ and HSO3- in mixed aqueous media

作者：Kaur Kamaljot; Chaudhary Savita; Singh Sukhjinder; Mehta S K^*

来源：Journal of Luminescence, 2015, 160: 282-288.

DOI：10.1016/j.jlumin.2014.12.035

• Tautomerization
• Solvatochromism
• Salicylideneaniline
• Chemosensor
• Chromogenic
• Multianalyte detection

A simple salicylaldehyde derived Schiff base N, N'- bis (p-chloro salicylidene)-1, 2- ethylenediamine (L) was synthesized and characterized. The receptor demonstrates simultaneous dual channel chromogenic and fluorogenic signaling towards HSO3- and Zn2+ in mixed aqueous media. Solvatochromism was employed systematically for modulating its optoelectronic properties. The probe was successfully assessed to monitor HSO3- detection via UV-vis spectroscopy. DFT calculations and H-1 NMR spectroscopy further support the results based on shifting of equilibrium. Moreover, the sensor showed large fluorescence enhancement with blue-shift of 48 nm after addition of Zn2+. The probe exhibits high selectivity over other competitive ions with high detection limit of 6.54 x 10(-5) M and 3.21 x 10(-6) M for HSO3- and Zn2+, respectively. Importantly, this is one of the rare reports in which Schiff base was utilized for the fabrication of chromogenic or fluorogenic sensor using solvent effect for multianalyte detection.

• 出版日期2015-4