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Abstract
Three metal-organic frameworks (MOFs) [La(bta)(H2O)]n (1), [La(bta)(H2O)2·H2O]n (2) and [Er(bta)(H2O)2·H2O]n (3) with different structures were synthesized by reactions of 1,3,5-benzenetriacetic acid (H3bta) with the corresponding lanthanide salts under different conditions. X-ray diffraction analyses reveal that complexes 1 and 2 have the same metal atom and ligand but different structures. In 1, each bta3 − adopts cis, cis, cis conformation and acts as a μ6-bridge linking six lanthanum atoms to form a 2D framework; while in 2, the bta3 − has cis, trans, trans conformation and serves as a μ5-bridging ligand, which results in a 3D channel-like structure. In the case of 3, each bta3 − also adopts cis, trans, trans conformation but acts as a μ4-bridge linking four erbium atoms to form a 3D channel-like framework. The results imply that the reaction conditions have great impact on the structure of MOFs, and the flexible triacid ligand H3bta is versatile and can adopt different conformations in the formation of MOFs. The magnetic property of complex 3 was investigated in the temperature range of 1.8–300 K.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 20231020) and the National Science Fund for Distinguished Young Scholars (Grant No. 20425101).
