Abstract
Developing efficient fluorescent sensors for Hg2+ ions is significant due to the highly toxic and hazardous nature of Hg2+. Therefore, a novel nickel-metal framework [Ni-(Bibt)2-(ttpda)0.5] based on hybrid ligands 4,7-bis(1H-imidazol-1-yl)benzo[c][1,2,5]thiadiazole (Bibt) and 5,5′-(1,3,6,8-Tetraoxo-1,3,6,8-tetrahydrobenzo[lmn]-3,8-phenanthroline-2,7-diyl)diisophthalic acid (H4ttpda), briefly named as NiBT, was constructed, which exhibited a doubly interpenetrated 4, 6-connected fsc 3D network and a simplified topological symbol of {44∙610∙8}{44∙62}. In addition, NiBT showed high solvent and thermal stability, and pH durability (2.0 - 12.0). Moreover, NiBT could be used as a sensor for mercury ions in water with several favorable features including turn-on fluorescence changes, rapid response (within 30 s), high selectivity and sensitivity (LOD: 8.7 nM), broad pH response scope (4.0 - 11.0), and reusability (5 times). The sensing mechanism could be mainly attributed to the interactions between the Hg2+ and Bibt ligand by coordination with N atoms in the frameworks.
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