Add time:07/26/2019         Source:sciencedirect.com

A new colorimetric styryl-benzimidazole based receptor to recognize more than one analyte trans-2-[4′−(dimethylamino)styryl]benzimidazole) (L1) has been synthesized and fully characterized by 13C and 1H NMR, elemental analysis, UV–vis spectroscopy, and HRMS. Investigation of sensing ability of receptor L1 was carried out in presence of multiple anions (Br−, CN−, Cl−, ClO4−, F−, HSO4−, PF6−, NO3−, S2−, OH−, AcO− and H2PO4−) and cations (Cu2+, Cr3+, Al3+, Mg2+, Cd2+, Ni2+, Fe3+, K+, Fe2+, Mn2+, Ag+, Hg2+, Ca2+, Co2+, Pb2+, Na+, and Zn2+) by using UV–vis spectroscopy. Receptor L1 showed colorimetric response towards only for HSO4− ion. Receptor L1-HSO4− interaction confirmed with the help of 1H NMR titration. Among various cations, L1 selectively sense the Cu2+ and Al3+ with the drastic colour change from yellow to green and dark yellow respectively. The stoichiometric binding ratio of L1 with HSO4−, Cu2+, and Al3+ found to be 1:1 by jobs method and HRMS data proved the complex formation between L1 and Cu2+/Al3+ with very low detection limit. In addition to explore practical applicability of L1, paper strips have been made and used to detect HSO4− and Cu2+ ions, respectively, up to 10 ppm level.

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