Bhattacharya A, Mahata S, Bandyopadhyay A, Mandal BB, Manivannan V. Application of 2,4,5-Tris(2-pyridyl)imidazole as "Turn-Off" Fluorescence Sensor for Cu (II) and Hg (II) ions and in vitro Cell Imaging.
LUMINESCENCE 2022;
37:883-891. [PMID:
35318807 DOI:
10.1002/bio.4232]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 11/11/2022]
Abstract
The 2,4,5-tris(2-pyridyl)imidazole (L) molecule has been evaluated as a probe for dual sensing of Hg2+ and Cu2+ ions in EtOH/HEPES buffer medium (5mM, pH=7.34, 1:1, v/v). Probe L shows a good sensitive and selective turn-off response in the presence of both Hg2+ and Cu2+ ions, which is comprehensible under long UV light. The probe can detect Cu2+ ion in the pH range of 3-11 and Hg2+ ion in 6-8. The limit of detection for Cu2+ (0.77 μM) is well under the allowable limit prescribed by the United States Environmental Protection Agency. Two metal (Cu2+ /Hg2+ ) ions are needed per L for complete fluorescence quenching. The probe shows remarkable reversibility on treatment with Na2 EDTA, making the protocol more economical for practical purposes. Paper strip coated with the L solution of EtOH can detect the presence of Cu2+ and Hg2+ ions in the sample by visible quenching of the fluorescence intensity. DFT-TDDFT calculations support experimental observations, and d-orbitals of Cu2+ /Hg2+ provide a non-radiative decay pathway. Cell imaging study using HDF and MDA-MB-231 cells also supported the viability of L in detecting Cu2+ and Hg2+ ions in living cells.
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