A new unsymmetrical ferrocene-based double azine as a multichannel chemosensor for the detection of Cu2+ ions
Shahriar Sharifi, A. Wahid Mesbah, E. Iravani
Abstract
1,4-Bis((ferrocenylidenehydrazono)methyl)benzene (L) as an unsymmetrical double azine was synthesized in good yield with a simple and cost-effective procedure by the reaction of ferrocenecarboxaldehyde hydrazone (1) with terephthalaldehyde. L was characterized by 1H-NMR, 13C-NMR, FT-IR spectroscopy, and the ESI-MS technique. Distinctive color change from yellow-orange to colorless was observed for the L solution by adding 1 equiv of Cu2+ ions. Based on UV-Vis and fluorescence spectra, cyclic voltammetry (CV), and linear sweep voltammetry (LSV), L is an excellent multichannel chemosensor for Cu2+ ions detection with high selectivity over many other metal ions. The calculated limit of detection (LOD) from the fluorescence and LSV titration of L with Cu2+ were 4.2 × 10-6 M and 1.78 × 10-5 M, respectively.