Hg2+-Promoted Spirolactam Hydrolysis Reaction: A Design Strategy for the Highly Selective Sensing of Hg2+ over other Metal Ions in Aqueous Media
- Authors
- Mai Van Bay; Nguyen Khoa Hien; Son, Subin; Nguyen Duy Trinh; Nguyen Tien Trung; Pham Cam Nam; Kim, Jong Seung; Duong Tuan Quang
- Issue Date
- 1-1월-2019
- Publisher
- MDPI
- Keywords
- fluorescence; hydrolysis; rhodamine; quantum chemical calculations; mercury
- Citation
- SENSORS, v.19, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS
- Volume
- 19
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68369
- DOI
- 10.3390/s19010128
- ISSN
- 1424-8220
- Abstract
- A mercury sensor (N-(rhodamine-6G)lactam-ethylenediamine-4-dimethylamino-cinnamaldehydeRLED) based on the Hg2+-promoted hydrolysis reaction has been designed and developed with a combination of theoretical calculations and experimental investigations. The interaction between RLED and Hg2+ goes through a fast-initial stage with formation of a 1:1 complex, followed by a slow hydrolysis process. The formation of durable intermediate complexes is due to quite a long hydrolysis reaction time. As a result, RLED can selectively detect Hg2+ in the presence of other metal ions, with a detection limit of 0.08 M for the colorimetric method, and of 0.008 M with the fluorescent method. In addition, the RLED sensor can work in a solution with a small amount of organic solvent, with a wide pH range from 5 to 10. The time-dependent density functional theory has been used for investigations of the excitation and de-excitation processes in RLED, intermediate complexes, and reaction products, thereby clarifying the changes in the fluorescence intensity before and after the RLED interacts with Hg2+ ions.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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