A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe<sup>3+</sup> and Efficient Capture of Anionic Dyes
Zhen‐Zhen Xue, Qian-Wen Guan, Lei Xu, Xiangdong Meng, Jie Pan
Abstract
In virtue of the dual-ligand strategy, a novel Zn(II)-organic coordination polymer [Zn(tipb)(bpda)0.5·(OH)]n (1) (tipb = 1,3,5-tris(p-imidazolylphenyl)benzene, H2bpda = 4,4′-biphenyldicarboxylic acid) has been successfully constructed with a N-donor tridentate ligand and an O-containing linear linker. In compound 1, a double-layer network is fabricated wherein adjacent Zn-tipb layers are pillared by bpda2–. Mutual interpenetration of the parallel layers further generates a 3D cationic supramolecular architecture. Interestingly, compound 1 displays a high sensitivity for the recognition of iron(III) ion with the calculated Ksv value being 1.06 × 104 M–1. In addition, the competitive detection experiment shows that the detection of Fe3+ could not be affected by any other interfering cations, suggesting the high selectivity of 1 toward the sensing of targeted species. Moreover, compound 1 can effectively capture anionic dye pollutants such as methyl orange and Congo red through the process of ion exchange, indicating the great possibility of 1 as a promising absorbent for the treatment of dye-wastewater.