Journal
RSC ADVANCES
Volume 5, Issue 118, Pages 97874-97882Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra20760f
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi
- University of Delhi
- UGC, New Delhi
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Pyridine-2,6-dicarboxamide based probes containing phenyl (L1), naphthyl (L2) and anthracenyl (L3) groups have been synthesized and screened towards Na+, Mg2+, Ca2+, Cr3+, Mn2+, Mn3+, Fe2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Hg2+, Cd2+ and Pb2+ ions. Probes L2 and L3 exhibited remarkable sensing for Fe2+ and Fe3+ ions with L3 being particularly selective. Collective studies comprising of Job's plot, Benesi-Hildebrand fitting, Stern-Volmer plot and detection limit display notable sensing ability of probe L3 for Fe3+ as compared to Fe2+ ion. Competitive binding studies in presence of other metal ions further illustrated the high efficiency of L3. The probe L3 binds to Fe3+ ion by forming a 1 : 1 complex with the apparent association constant (K-a) of 3.31 x 10(3) M-1. L3-Fe3+ system is shown to have potential applications in logic gate and cell imaging.
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