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Updated: May 21, 2025

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
Selective Crystallization Separation Driven by Structural Divergence in Lanthanide Mixed-Organic Systems
Xuemiao Yin1, Yumin Wang2, Yanhui Li1
1Advanced Research Institute for Multidisciplinary Science, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Abstract:
Lanthanide separation remains challenging due to their shielded 4f orbitals, which prevent bonding with ligand orbitals. The slight decrease in the Ln3+ ionic radii from La3+ to Lu3+ leads to highly similar coordination environments, making their differentiation even more difficult. In this study, a unique complex organic system based on 1,10-phenanthroline-2,9-dicarboxylic acid (H2PDA), N,N'-dimethylformamide (DMF), and its decomposition products was developed to achieve selective crystallization separation of lanthanide elements. Through the study of the crystallization periodicity of lanthanides in the solvothermal systems, we enabled the efficient crystallization separation of lanthanides such as La/Ce, La/Sm and La/Lu, with binary separation factors of 2.0 ± 0.1, 8.9 ± 0.1, and 26.9 ± 3.1, respectively.
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