Three Novel Zn-Based Coordination Polymers: Synthesis, Structure, and Effective Detection of Al(3+) and S(2−) Ions

Three novel Zn-based coordination polymers (CPs), [Zn(MIPA)](n) (1), {[Zn(MIPA)(4,4′-bipy)(0.5)(H(2)O)]·1.5H(2)O}(n) (2), and {[Zn(MIPA)(bpe)]·H(2)O}(n) (3) (MIPA = 4-methoxyisophthalic acid, 4,4′-bipy = 4,4′-bipyridine, bpe = (E)-1,2-di(pyridine-4-yl)ethane), were constructed by ligand 4-methoxyisophthalic acid under solvothermal conditions. Compound 1 features a beaded 2D-layer architecture, while compound 2 presents a 2-fold interpenetrating structure with a uninodal three-connected hcb topology. Compound 3 has a 3-fold interpenetrated four-connected dmp topology. Photoluminescence investigations of compound 2 were explored in detail, by which ions were detected, and it was observed to have the highest quenching efficiency toward Al(3+) and S(2−) ions. The possible fluorescence quenching mechanisms of 2 toward Al(3+) and S(2−) ions were also explored. To the best of our knowledge, this is the first potential dual-responsive luminescent probe based on a Zn(II) coordination polymer for detecting Al(3+) and S(2−) ions via a luminescence quenching effect in ethanol.