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

• Published in: CrystEngComm 2023-05, Vol.25 (2), p.333-343
• Main Authors: Zhang, Kena, Wang, Qiushuang, Gong, Yuanyuan, Wang, Nairong, Li, Xia
• Format: Article
• Language: English
• Subjects: Chemical synthesis; Coordination polymers; Ligands; Propane
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d3ce00179b

Four Zn( ii ) metal-organic coordination polymers (Zn-MCPs), [Zn 2 (O-cpia)(2,2′-bpy)·OH] ( 1 ), Zn 2 (O-cpia)(4,4′-bpy) 0.5 ·OH ( 2 ), Zn 3 (O-cpia) 2 (bpp) 2 ·H 2 O ( 3 ) and [Zn 4 (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-cpiaH 3 ) 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 Zn 2+ ions and two μ 3 -OH groups formed [Zn 4 (μ 3 -OH) 2 ] tetranuclear SBUs in 1 , 2 , and 4 , further linking together to build different frameworks by different ligand bridging modes. Moreover, the [Zn 4 (μ 3 -OH) 2 ] units are composed of Zn( ii ) ions in different coordination environments. 3D ( 1 ) is composed of [Zn 4 (μ 3 -OH) 2 ] containing [Zn1O 5 ] and [Zn2O 4 N 2 ] units by an O-cpia linker. 3D ( 2 ) consists of [Zn 4 (μ 3 -OH) 2 ] with [Zn1O 4 N 1 ] and [Zn2O 4 ] units via O-cpia/4,4′-bpy mixed ligands. 3D ( 3 ) comes from [Zn 2 (COO) 4 ] ([Zn2O 4 N 1 ]) and [Zn1O 2 N 2 ] by O-cpia/bpp mixed ligands. 2D network ( 4 ) is composed of [Zn 4 (μ 3 -OH) 2 ] with [Zn1O 4 N 2 ], [Zn2O 5 ], [Zn3O 5 ], and [Zn4O 4 N 2 ] 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. Four Zn( ii ) complexes were synthesized. Complex 1 detected BPA and IMH with low detection limits and short response time.