A luminescent on-off probe based calixarene linked through triazole with ruthenium(II) polypyridine complexes to sense copper(II) and sulfide ions
Mohanraj Ramachandran, Sambandam Anandan, Muthupandian Ashokkumar
NEW JOURNAL OF CHEMISTRY | ROYAL SOC CHEMISTRY | Published : 2019
A bis-ruthenium(ii) polypyridyl complex was connected with a p-tert-butyl calixarene platform (Ru2L) through 1,2,3-triazole and used as a luminescent probe to detect selected ions. Ru2L acted as a highly sensitive and selective turn off sensor towards Cu2+ ions in CH3CN/10 mM HEPES buffer (pH = 7.4) (8/2, v/v) medium. The detection limit of Cu2+ was found to be 4.11 μM. The Cu2+ ion binding with Ru2L showed a paramagnetic signal in EPR analysis. The ensemble (Ru2L-Cu2+) was investigated with a variety of anions, but only sulfide anions enhanced the emission intensity in the presence of other anions. The ensemble works as a turn-on sensor towards S2-via a metal ion displacement method to f..View full abstract
Awarded by Department of Science and Technology, India under Water Technology Initiative scheme
Awarded by CSIR, New Delhi
Awarded by MHRD, New Delhi
This research was financially supported by the Department of Science and Technology, India under Water Technology Initiative scheme (DST/TM/WTI/2K16/258). MR thanks CSIR, New Delhi for a junior research fellowship (09/895(0009)/2017-EMR-I). The authors SA & MA thank MHRD, New Delhi for sanctioning them a joint Scheme for Promotion of Academic and Research Collaboration project (SPARC/2018-2019/P236/SL).