A dihydrazone based conjugated bis Schiff base chromogenic chemosensor for selectively detecting copper ion

• Published in: Inorganica Chimica Acta 2021-03, Vol.517, p.120199, Article 120199
• Main Authors: Sahu, Meman, Manna, Amit Kumar, Patra, Goutam K.
• Format: Article
• Language: English
• Subjects: Chemical sensors; Chemoreceptors; Colorimetric sensor; Colorimetry; Copper; Cu2+ sensor; Dihydrazone; Imines; NMR; Nuclear magnetic resonance; Real sample analysis; Schiff base; Stoichiometry; Test kit; Water sampling
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2020.120199

A dihydrazone based novel bis Schiff base receptor, (L) has been developed for colorimetric detection of Cu2+ ion. The chemosensor L displayed excellent selectivity and sensitivity towards Cu2+ ion with detection limit value 5.3 × 10−7 M with binding stoichiometry 1:1 and association constant value 1.3 × 104 M−1. This can be applied for the detection of Cu2+ ion in real samples. [Display omitted] •A novel dihydrazone based conjugated bis Schiff base chromogenic chemosensor (L) has been developed.•L can selective detect Cu2+ ion with lower limit of detection, 5.3 × 10−7 M.•The interaction of L with Cu2+ has been confirmed with NMR, FTIR, and ESI-MS.•L can be used to detect Cu2+ ion in real samples and as test kit. A simple dihydrazone based bis Schiff base receptor L has been presented for the first time for colorimetric selective detection of Cu2+ ion in methanol-H2O (1:1 v/v, pH = 7.4 in HEPES buffer) with detection limit value 5.3 × 10−7 M. The binding stoichiometry was obtained as 1:1 from job’s plot analysis, 1H NMR and ESI-MS spectra with the association constant value 1.3 × 104 M−1. The chemosensor L can be applied for the recovery of contaminated water samples and also successfully used to detect Cu2+ ion using a test kit coated with L.