Four Zn(ii)-5-(2-carboxy-phenoxy)-1,3-benzenedicarboxylate coordination polymers induced by different N-ligands: synthesis, structure, and fluorescence detection for BPA and IMH?

CrystEngComm Pub Date: 2023-04-13 DOI: 10.1039/D3CE00179B

Abstract

Four Zn(II) metal–organic coordination polymers (Zn-MCPs), [Zn2(O-cpia)(2,2′-bpy)·OH] (1), Zn2(O-cpia)(4,4′-bpy)0.5·OH (2), Zn3(O-cpia)2(bpp)2·H2O (3) and [Zn4(O-cpia)2(phen)2·(OH)2] (4), were synthesized by using the mixed ligand approach, namely 5-(2-carboxyl-phenoxy)-1,3-benzenedicarboxylic acid (O-cpiaH3) and different auxiliary N-donor ligands 2,2′-bipyridine (2,2′-bpy), 4,4′-bipyridine (4,4′-bpy), 1,3-di(4-pyridyl)propane (bpp), and 1,10-phenanthroline (phen). The four Zn-MCPs exhibited different architectures based on different secondary building units (SBUs) and different ligand bridging modes. Four adjacent Zn2+ ions and two μ3-OH groups formed [Zn4(μ3-OH)2] tetranuclear SBUs in 1, 2, and 4, further linking together to build different frameworks by different ligand bridging modes. Moreover, the [Zn4(μ3-OH)2] units are composed of Zn(II) ions in different coordination environments. 3D (1) is composed of [Zn4(μ3-OH)2] containing [Zn1O5] and [Zn2O4N2] units by an O-cpia linker. 3D (2) consists of [Zn4(μ3-OH)2] with [Zn1O4N1] and [Zn2O4] units via O-cpia/4,4′-bpy mixed ligands. 3D (3) comes from [Zn2(COO)4] ([Zn2O4N1]) and [Zn1O2N2] by O-cpia/bpp mixed ligands. 2D network (4) is composed of [Zn4(μ3-OH)2] with [Zn1O4N2], [Zn2O5], [Zn3O5], and [Zn4O4N2] units by O-cpia ligands. Luminescence sensing studies revealed that 1 detected 2,2-bis(4,4′-hydroxyphenyl)-propane (BPA) and imipramine hydrochloride (IMH) with detection limits of 1.495 × 10?6 M and 9.92 × 10?5 M, respectively. The sensing mechanism is attributed to the absorption of BPA/IMH under excitation.

Graphical abstract: Four Zn(ii)-5-(2-carboxy-phenoxy)-1,3-benzenedicarboxylate coordination polymers induced by different N-ligands: synthesis, structure, and fluorescence detection for BPA and IMH
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