Temperature-Induced Structural Transformations of Lanthanide Coordination Polymers Based on a Semirigid Tricarboxylic Acid Ligand: Crystal Structures and Luminescence Properties

• Published in: Crystal growth & design 2022-03, Vol.22 (3), p.1583-1593
• Main Authors: Xu, Mei-Yu, Liang, Guang-Yuan, Feng, Jian-Shen, Liang, Guang-Ming, Wang, Xiu-Jian
• Format: Article
• Language: English
• ISSN: 1528-7483; 1528-7505
• DOI: 10.1021/acs.cgd.1c01041

Three new types of lanthanide coordination polymersone-dimensional (1D) {[Ln­(TCMA)­(HTCMA)]·(DMF)·(H2O)2} n (1–2), three-dimensional (3D) {[Ln­(TCMA)­(NO3)]} n (3–4), and zero-dimensional (0D) Ln4­(TCMA)4­(OH)4­(H2O)8 (5–6) (Ln = Eu, Tb) have been hydrothermally synthesized by using the ligand N,N,N-tris­{(2′-carboxy­[1,1′-biphenyl]-4-yl)­methyl}­methylammonium chloride ([H3TCMA]+­Cl). Interestingly, the 1D chain and 3D Ln-MOFs can be transformed to a more stable 0D cage structure by changing temperature-induced ligand’s configuration transformation, which is attributed to the ligand’s semirigid feature. Furthermore, the crystal structures of 1–6 were characterized and confirmed by X-ray single-crystal analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), ultimate analysis, and infrared (IR) spectroscopy. The luminescence detection results show that the 3D Eu-MOFs have good sensitivity and selectivity to detect Fe3+ ions in methanol solutions. And, with careful adjustment of metal ratios (Eu/Tb) in the reaction mixtures, color tuning was easily achieved. Moreover, lifetime data and quantum yield are reported for these complexes (1–6) prepared in this study.