Abstract
By selecting the luminescent tricarboxylate ligand H3L, a novel 3D Co(II)-based coordination polymer (compound 1) with the formula [Co(HL) (bpe)] (H3L = 5-(3,4-dicarboxylphenoxy) nicotic acid; bpe = 1,2-bis(4-pyridyl) ethylene) has been solvothermally synthesized, which features a 2-nodal (3, 5)-connected net with the Schläfli sign of (63·69·8). Particularly, it is found that compound 1 possesses good chemical and thermal stability. Luminescence measurements indicate that this material shows rare ratiometric turn-on luminescence response toward ascorbic acid (AA). The relative luminescent intensity ratio (I362/I410) increases linearly with increasing AA concentration in the 0–25 μM range with detection limit of 0.68 μM. Compound 1 could also respond to acetylacetone through luminescence turn-off mechanism. The limit of detection is estimated to be 1.35 μM. Both proposed sensing systems show good sensitivity, high selectivity and excellent anti-interference performance. In addition, the possible sensing mechanisms are also elaborately investigated.
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