Issue 46, 2021

Various carboxylates induced eight Zn(ii)/Cd(ii) coordination polymers with fluorescence sensing activities for Fe(iii), Cr(vi) and oxytetracycline

Abstract

To study the effects of metal ions and various carboxylates on the assembly and structures of coordination polymers (CPs) based on a bis-pyridyl-bis-amide ligand [N,N′-bis(4-methylpyridine-4-yl)-2,6-naphthalene dicarboxylamide] (4-bmnpd), eight Zn(II) and Cd(II) CPs, namely [Cd(4-bmnpd)(2-NBA)2] (1), [Cd(4-bmnpd)(3-NIP)(H2O)] (2), [Cd2(4-bmnpd)(TCPA)2] (3), [Cd(4-bmnpd)(5-HIP)(H2O)] (4), [Cd(4-bmnpd)0.5(5-MIP)(H2O)] (5), [Cd3O(4-bmnpd)(1,4-PHDA)2(H2O)]·H2O (6), [Zn(4-bmnpd)(5-MIP)] (7) and [Zn(4-bmnpd)(1,2,4,5-BTA)0.5]·2H2O (8) [2-HNBA = 2-nitrobenzoic acid, 3-H2NIP = 3-nitrophthalic acid, H2TCPA = tetrachlorophthalic acid, 5-H2HIP = 5-hydroxyisophthalic acid, 5-H2MIP = 5-methylisophthalic acid, 1,4-H2PHDA= 1,4-phenylenediacetic acid and 1,2,4,5-H4BTA = 1,2,4,5-benzenetetracarboxylic acid] were synthesized under hydrothermal conditions. CPs 1–8 were characterized by elemental analysis, IR and powder X-ray diffraction. Both CPs 1 and 2 are 2D networks. CP 3 shows a 2D 3,4,5-coordinated net based on binuclear nodes. CPs 4 and 5 are 2D lamellar structures with (4,4) and (3,4) topologically connected patterns, respectively. CP 6 is a 3D framework constructed from multi-member [Cd10(1,4-PHDA)4]n rhombus rings and 1D [Cd3O2]n chains. CP 7 is a 1D ladder structure. CP 8 is a 2D structure extended by deprotonation of 1,2,4,5-H4BTA and 4-bmnpd linkers. The influence of the choice of metal as well as the carboxylic acid on the structures of the above CPs is discussed in detail. The fluorescence sensing properties of CPs 1–8 toward metal cations (Fe3+), anions (CrO42−, Cr2O72−) and antibiotics (oxytetracycline) were investigated. The limits of detection for Fe3+, CrO42−, Cr2O72− and oxytetracycline were 6.9 × 10−5–1.5 × 10−4, 6.9 × 10−5–1.3 × 10−4, 7.7 × 10−5–1.3 × 10−4, and 8.5 × 10−5–9.6 × 10−4, respectively.

Graphical abstract: Various carboxylates induced eight Zn(ii)/Cd(ii) coordination polymers with fluorescence sensing activities for Fe(iii), Cr(vi) and oxytetracycline

Supplementary files

Article information

Article type
Paper
Submitted
30 8 2021
Accepted
12 10 2021
First published
08 11 2021

CrystEngComm, 2021,23, 8077-8086

Various carboxylates induced eight Zn(II)/Cd(II) coordination polymers with fluorescence sensing activities for Fe(III), Cr(VI) and oxytetracycline

Y. Chen, G. Liu, X. Wang, X. Lu, N. Xu, Z. Chang, Z. Zhang and X. Li, CrystEngComm, 2021, 23, 8077 DOI: 10.1039/D1CE01166A

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