Combined experimental and theoretical studies on a phenyl thiadiazole-based novel turn-on fluorescent colorimetric Schiff base chemosensor for the selective and sensitive detection of Al

• Published in: New journal of chemistry 2020-07, Vol.44 (26), p.1819-1832
• Main Authors: Manna, Amit Kumar, Chowdhury, Shubhamoy, Patra, Goutam K
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d0nj01954b

Herein, we have presented a phenyl thiadiazole-based Schiff base receptor, 2-[( Z )-(5-phenyl-1,3,4-thiadiazol-2-ylimino)methyl]-6-methoxy-4-nitrophenol ( L ) for the first time for turn-on fluorescent, colourimetric detection of Al 3+ ions. The chemosensor L displayed very quick responses, excellent selectivity and sensitivity towards Al 3+ ions in methanol-Tris-HCl buffer medium (10 mM, pH 7.2, and 1 : 1 v/v) with colourimetric and fluorometric detection limit values of 1.43 × 10 −7 M and 1.15 × 10 −7 M, respectively. The binding stoichiometry was obtained as 2 : 1 from the Job plot analysis and ESI-MS spectra with the association constant value of 1.76 × 10 2 M −1/2 . The experimental results have further been supported by thorough DFT and TD-DFT studies. The chemosensor L can be applied for the formation of binary logical devices, recovery of contaminated water samples and smartphone-based chemical analysis. A phenyl thiadiazole based receptor ( L ) has been presented for fluorescent colorimetric detection of Al 3+ ion with very low detection limit in aqueous medium. The probe L can be applied for logic gate formation, recovery of contaminated water samples and smart-phone based analysis.