Detection of sulfide ion and gaseous H2S using a series of pyridine-2, 6-dicarboxamide based scaffolds. Issue 28 (3rd July 2018)

• Record Type: Journal Article
• Authors: Kumar, Pramod; Kumar, Vijay; Pandey, Saurabh; Gupta, Rajeev
• Is Part Of: Dalton transactions. Volume 47:Issue 28(2018)
• Page Start: 9536
• Page End: 9545
• Publication Date: 2018-07-03
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt01351a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : This work presents a series of pyridine-2, 6-dicarboxamide based scaffolds with different appendages and their roles as chemosensors for the selective detection of S 2− ion, as well as gaseous H2 S, in primarily aqueous media. Abstract : Pyridine-2, 6-dicarboxamide based scaffolds with different appendages act as chemosensors for the selective detection of S 2− ion, as well as gaseous H2 S, in primarily aqueous media. Out of nine synthesized chemosensors, one with benzothiazole ring appendages was found to be highly selective for S 2− ion and gaseous H2 S. A series of spectroscopic studies confirmed that sulfide ion abstracts amidic N–H groups thus leading to the in situ generation of HS − ion, which remain bound to the pincer cavity of the resultant anionic chemosensor, and it was found that acetic acid could be used to reverse this process. It was essential for a chemosensor to feature a pincer cavity to recognize sulfide ion, whereas the sensing mechanism involved the deprotonation of the amidic N–H groups. We also illustrate the detection of sulfide ions and gaseous H2 S in live cells and paper-strip sensing applications.