Fluorescence tunable thiophene-bis(benzimidazole)-based probes for a cascade trace detection of Hg2+ and lysine: A molecular switch mimic
- Authors
- Kumar, Ashwani; Chae, Pil Seok
- Issue Date
- Feb-2019
- Publisher
- Elsevier BV
- Keywords
- Thiophene-bis(benzimidazole); Hg2+; Lysine; ON-OFF-ON; Switch; Logic gate
- Citation
- Sensors and Actuators, B: Chemical, v.281, pp.933 - 944
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators, B: Chemical
- Volume
- 281
- Start Page
- 933
- End Page
- 944
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/3487
- DOI
- 10.1016/j.snb.2018.11.023
- ISSN
- 0925-4005
- Abstract
- Six thiophene-bis(benzimidazole)-based molecular probes with tunable fluorescence emission were synthesized for selective Hg2+ detection. Probe 1 contains a thiophene-bis(benzimidazole) unit without an appendage, while probes 2-4 have multiple appendages on benzimidazole rings of the core and probe 6/7 has two biphenyl appendages on the thiophene ring. Fluorescence emissions of all these probes were selectively quenched upon Hg2+ addition, but probe 7 provided the most sensitive detection of Hg2+, giving the highest association constant (K-a (7) = 2.38 x 10(6) M-1) and the lowest observed and calculated limit of detections (LODs) (5 nM and 0.047 pM, respectively). Thus, the probe 7-Hg2+ complex was further tested for detection of a biomolecule as a next step. Among the various biomolecules tested (including amino acids), L-lysine (Lys) uniquely showed a full restoration of the fluorescence intensity of [probe 7 + Hg2+ (1:2)]-complex to the level of the free probe, with an LOD of 5 nM. Thus, a cascade detection of Hg2+ and Lys was attained by probe 7 via selective quenching and recovering of the fluorescence intensity, which enables us to build an "ON-OFF-ON" switch and logic gate at a molecular level. The current system was fully studied by various analytical methods such as UV-vis, fluorescence, and H-1 NMR spectroscopies, IR, FE-SEM images, and DFT calculations.
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