A highly selective and sensitive fluorescent chemosensor for distinguishing cadmium(ii) from zinc(ii) based on amide tautomerization. (7th November 2018)

• Record Type: Journal Article
• Authors: Zhang, Yuanyuan; Chen, Xiangzhu; Liu, Jingjing; Gao, Gui; Zhang, Xueyan; Hou, Shicong; Wang, Hongmei
• Is Part Of: New journal of chemistry. Volume 42:Number 23(2018)
• Page Start: 19245
• Page End: 19251
• Publication Date: 2018-11-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj03465f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A naphthalimide-derived fluorescent sensor termedL2 was designed and synthesized. Abstract : A naphthalimide-derived fluorescent sensor termedL2 was designed and synthesized. This sensor showed a highly selective, sensitive, and reversible turn-on response to Cd 2+ over other metal ions in a wide pH range with a detection limit of 2.35 × 10 −10 M. The amide/di-2-picolylamine receptor binds Cd 2+ in the imidic acid tautomeric form but other metal ions in the amide tautomeric form. Moreover, the sensor can be used to distinguish Cd 2+ and Zn 2+ with the naked eye. The Cd 2+ -binding mode and the recognition mechanism of the sensor were investigated using Job's plot, 1 H NMR, HRMS, IR and DFT calculations. Furthermore, the sensor was successfully applied as the active component of indicator papers for on-site detection of Cd 2+ in pure water and in fluorescence imaging of Cd 2+ in HeLa cells.