期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 247, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2022.114272
关键词
Phenanthridine; Terpyridine; Ratiometric; Cadmium; Live cells image
资金
- Vellore Institute of Technology
- [VIT/HR/Fac.Appt/2021/6876]
A novel compound with strong selectivity for the detection of toxic metal ion Cd2+ has been synthesized, which can achieve a quantitative recognition without interference from other transition metal ions.
A turn-on Donor-pi-Acceptor (D-pi-A) containing phenanthridine-functionalized extended pi-conjugate terpyridine, 5-(4 '-([2,2 ':6 ',2-terpyridin]- 4 '-yl)-[1,1 '-biphenyl]4-yl)7,8,13,14-tetrahydrodibenzo [a, i] phenanthridine (TBTP) was synthesised. It shows strong selectivity for the detection of toxic Cd2+ without interference from other metal ions. In the presence of Cd2+, the absorption of the TBTP changes dramatically along with the fluorescent emission with the large Stokes shift of 6300 cm-1. When the compound TBTP is exposed to UV light, its colour changes from blue to orange over the addition of Cd2+. Adding other transition metal ions has no effect. This is based on the mechanism of intramolecular charge transfer. The detection limit for Cd2+ was found to be around 1.181 x 10-8 M. An investigation of the sensing mechanism includes job plot, NMR titration, DFT calculation, and HRMS analyses. Excitingly, the recognition of Cd2+ in CH3CN: H2O (8:2, v/v) medium is quantitative without interference from Zn2+, which is a common interferent for Cd2+. Furthermore, the probe was used for detecting Cd2+ in real water samples and cell imaging in living cells was also performed.
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