Unveiling Role of Metals in Mononuclear Metal‐Complexes for Chemodosimetric Detection of S2− from aqueous medium: Experimental and DFT Corroboration with Real‐Field Application. Issue 12 (24th March 2022)

• Record Type: Journal Article
• Authors: Pandit, Nithun Ranjan; Bej, Sourav; Banerjee, Priyabrata; Biswas, Biplab
• Is Part Of: ChemistrySelect. Volume 7:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-24
• Subjects: Chemodosimetric approach -- DFT -- Dip-Stick -- Electrochemistry -- Gas Sensor; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202200307
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Herein, we have reported two isostructural mononuclear metal complexes [M(HL)2 (ClO4 )2 ], wherein, M= Co 2+ ( viz . SN‐1 ) and Ni 2+ ( viz . SN‐2 ) and HL is NNO donor Schiff‐base ligand i. e . ( (E) ‐2‐methyl‐2‐((pyridin‐2‐ylmethylene)amino)propan‐1‐ol) for unveiling as molecular sensor for S 2− (sulphide) like hazardous entity. The molecular probes have been characterized by SCXRD, 1 H‐NMR, FT‐IR, HRMS etc . X‐ray diffraction studies confirm the mono‐nuclear structures of both the complexes. Interestingly, SN‐1 exhibited remarkable sensitivity towards S 2− by naked eye colour change in purely aqueous medium with detection limit of 33.5 nM and binding constant of 11.05 × 10 8 M −1 while the SN‐2 didn't show any subtle chromogenic changes upon interaction with the targeted analyte. Judicious choice of metal centre plays a pivotal role for such discriminative interacting behaviour. Spectroscopic and DFT studies shed light on the mechanistic pathway of host‐guest interaction, indicating a S 2− mediated chemodosimetric approach following HSAB principle. Impressively, the SN‐1 has also been explored towards fabrication of test strips for on‐field detection of H2 S/S 2− via . "Dip‐Stick" approaches. In a nutshell, the presently developed simple mono‐nuclear metal complex can be utilised for detecting gasotransmitter like H2 S/S 2− from purely aqueous medium that may be helpful in fabricating " point‐of‐care " devices in coming days for better understanding of H2 S as a key role maker in various health related issues. Abstract : Two isostructural mononuclear metal complexes [M(HL)2 (ClO4 )2 ], (wherein, M= Co 2+ ( viz . SN‐1) & Ni 2+ ( viz . SN‐2)) have been reported for unveiling as molecular sensor towards S 2− . Interestingly, SN‐1 has shown remarkable sensitivity towards S 2− having detection limit of 33.5 nM with binding constant of 11.05 × 10 8 M −1 while the SN‐2 didn't show any subtle chromogenic changes upon interaction with the targeted analyte. Spectroscopic and DFT studies shed light on the mechanistic pathway of host‐guest interaction, indicating a S 2− mediated chemodosimetry.