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Updated: Dec 21, 2025
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
A stable dysprosium(iii) complex with a terminal fluoride ligand showing high resolution luminescence and slow
Bo-Kai Ling1, Yuan-Qi Zhai, Junbo Han
1Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University Shenzhen Research School, State Key Laboratory of Mechanical Behavior for Materials, MOE Key Laboratory for Nonequilibrium Synthesis of Condensed Matter, Xi'an Key Laboratory of Sustainable Energy and Materials Chemistry, School of Science, Xi'an Jiaotong University, 99 Yanxiang Road, Xi'an, Shaanxi 710054, P. R. China. hantian0123@xjtu.edu.cn zheng.yanzhen@xjtu.edu.cn.
Abstract:
An air-stable dysprosium(iii) complex, [C(NH2)3]4[DyF(piv)4](piv)2 (piv = pivalate), with a terminal fluoride ligand protected by forming extensive hydrogen bonds with peripheral guanidiniums has been isolated. Though the magnetic data failed to determine the energy barrier for the magnetic reversal (Ueff) accurately, the fine emission spectrum of the 4F9/2→6H15/2 transition at 4.2 K and ab initio calculations reveal that the Ueff is about 376(20) K, which is among the highest for high-coordinate (coordination numbers ≥ 9) lanthanide mononuclear magnets.
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