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Updated: Feb 2, 2026
13:21
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
15.4K
Single molecule magnetic behaviour in lanthanide naphthalenesulfonate complexes
Guo Peng1, Ying-Ying Zhang1, Bo Li2
1Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094 Nanjing, P. R. China. guopeng@njust.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|November 28, 2018
Summary
Lanthanide complexes featuring 2-naphthalenesulfonate ligands exhibit unique chiral structures and single-molecule magnet (SMM) properties. These findings introduce novel 4f sulfonate-based SMMs with potential applications in molecular magnetism.
Area of Science:
- Coordination chemistry
- Materials science
- Magnetism
Background:
- Lanthanide complexes are explored for unique magnetic properties.
- Sulfonate ligands offer versatile coordination possibilities.
- Chiral structures are crucial for advanced magnetic materials.
Purpose of the Study:
- Synthesize and characterize novel lanthanide complexes using 2-naphthalenesulfonate (NAS).
- Investigate the structural, magnetic, and chiral properties of these complexes.
- Explore their potential as single-molecule magnets (SMMs).
Main Methods:
- Single crystal X-ray diffraction for structural determination.
- Circular dichroism (CD) spectroscopy to confirm chirality.
- Static and dynamic magnetic measurements to assess magnetic behavior.
Main Results:
- A series of isostructural mononuclear lanthanide complexes, [Ln(NAS)2(H2O)6](NAS)·3H2O, were synthesized.
- Complexes crystallized in an unprecedented chiral space group with square antiprismatic Ln geometry.
- Magnetically diluted samples exhibited zero-field SMM behavior, with compounds 2-4 showing energy barriers of 53, 32, and 45 K.
Conclusions:
- These are the first reported pure 4f sulfonate-based SMMs.
- The chiral nature and SMM properties highlight their significance in molecular magnetism.
- Lanthanide NAS complexes offer a promising platform for developing new magnetic materials.
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