Study on magnetic and dye adsorption properties of five coordination polymers based on triazole carboxylic acid ligands

• Published in: Journal of molecular structure 2023-07, Vol.1284, p.135379, Article 135379
• Main Authors: Ma, Qi-Chao, Yue, Tian-Cai, Cao, Qing-Wei, Xie, Ze-Bei, Dong, Qing-Wei, Wang, Duo-Zhi, Wang, Lu-Lu
• Format: Article
• Language: English
• Subjects: Coordination polymers; Dye adsorption; Magnetic properties; Triazole carboxylic acid ligands
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2023.135379

•New coordination polymers based on triazole carboxylic acid ligands were synthesized.•Complexes 1–4 have antiferromagnetic behavior.•Complex 5 can adsorb Congo red (CR) with adsorption capacity of 263.2 mg·g−1. Five new coordination polymers based on triazole carboxylic acid ligands, namely {[Mn2(L1)2(H2O)2]·H2O}n (1), [Ni2(L1)2(H2O)2]n (2), { [Co2(L1)2(H2O)2]·0.5H2O}n (3), [Cu(L2)2(H2O)]n (4) and [Zn(L3)(H2O)Cl]n (5) [H2L1=5-((4-(1H-1,2,4-triazol-1-yl)benzyl)amino)isophthalic acid, HL2 =4-((4-(1H-1,2,4-triazol-1-yl)benzyl)amino)benzoic acid, HL3=4-(((1H-1,2,4-triazol-3-yl)amino)methyl)benzoic acid] were hydro-/solvothermally synthesized and further characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC) and X-ray crystal diffraction. X-ray single-crystal diffraction revealed that complexes 1–3 are two-dimensional (2D) layered architectures, complex 4 and 5 are chain structures, and 5 further forms a 2D supramolecular structure through hydrogen-bonding interactions. The magnetic properties of complexes 1–4 were studied and the results showed that complexes 1–4 have antiferromagnetic behavior. In addition, complex 5 exhibits adsorption performance to Congo red (CR), the maximum adsorption capacity is 263.2 mg·g−1, and the adsorption isotherm, adsorption kinetics, effect of pH and cycling performance were investigated in detail.