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

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.

Automated summary

A new dihydrazone based bis Schiff base receptor L was developed for colorimetric selective detection of Cu2+ ion in methanol-H2O (1:1 v/v, pH = 7.4 in HEPES buffer) with a detection limit of 5.3 × 10-7 M. Analysis from various spectra revealed a binding stoichiometry of 1:1 and an association constant value of 1.3 × 104 M-1 for the interaction between L and Cu2+ ion. The chemosensor L can be used for recovering contaminated water samples and detecting Cu2+ ion effectively with a test kit coated with L.