In this work we report on the synthesis of a pyridyl/phenolic/benzothiazole functionalized colorimetric receptor (BPAP) that can selectively recognise Fe(III) and Fe(II) ions in aqueous medium with visible, naked eye colour changes. Moreover, BPAP behaves as a âturn-onâ fluorescent chemosensor, showing an excellent sensitivity towards Zn2+and Cd2+cations in water by exhibiting fluorometric change. BPAP exhibited a visible detection limit of 5.5 μM and 2.5 μM for Fe3+and Fe2+, respectively, and a fluorometric selectivity towards Zn2+and Cd2+ions with lower detection limits of 205 nM and 642 nM. To understand the mode of binding to the sensor, both the nude sensor and the Zn-complex were isolated and characterized by X-ray crystallography. In Zn-BPAP, the ligand acts as neutral tridentate through Npyridine, Namineand Namidedonor atoms. The N atom of benzothiazole group and the OH group of the phenole unit are not coordinated. Computational DFT study was performed on the free ligand BPAP and complex with Zn2+to investigate the interaction site, to calculate the energies of the frontier molecular orbitals and to corroborate some of the experimental results.
A real-time tripodal colorimetric/fluorescence sensor for multiple target metal ions
Caruso, Ugo
;Concilio, Simona;Piotto, Stefano;
2018
Abstract
In this work we report on the synthesis of a pyridyl/phenolic/benzothiazole functionalized colorimetric receptor (BPAP) that can selectively recognise Fe(III) and Fe(II) ions in aqueous medium with visible, naked eye colour changes. Moreover, BPAP behaves as a âturn-onâ fluorescent chemosensor, showing an excellent sensitivity towards Zn2+and Cd2+cations in water by exhibiting fluorometric change. BPAP exhibited a visible detection limit of 5.5 μM and 2.5 μM for Fe3+and Fe2+, respectively, and a fluorometric selectivity towards Zn2+and Cd2+ions with lower detection limits of 205 nM and 642 nM. To understand the mode of binding to the sensor, both the nude sensor and the Zn-complex were isolated and characterized by X-ray crystallography. In Zn-BPAP, the ligand acts as neutral tridentate through Npyridine, Namineand Namidedonor atoms. The N atom of benzothiazole group and the OH group of the phenole unit are not coordinated. Computational DFT study was performed on the free ligand BPAP and complex with Zn2+to investigate the interaction site, to calculate the energies of the frontier molecular orbitals and to corroborate some of the experimental results.File | Dimensione | Formato | |
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