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Enhancing single-molecule magnet behaviour through decorating terminal ligands in Dy2 compounds
Xiufang Ma1, Bingbing Chen1, Yi-Quan Zhang2
1State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China. xiangyuliu432@126.com.
Dalton Transactions (Cambridge, England : 2003)
|August 6, 2019
Summary
Two dysprosium (DyIII) dimers were synthesized and studied for single-molecule magnet (SMM) behavior. Compound 2, with chloro-substituents, exhibited superior SMM properties compared to compound 1, with fluoro-substituents, due to enhanced magnetic anisotropy and exchange interactions.
Area of Science:
- Coordination Chemistry
- Materials Science
- Magnetism
Background:
- Dysprosium (DyIII) complexes are investigated for single-molecule magnet (SMM) applications.
- Tuning ligand substituents can influence the magnetic properties of DyIII-based SMMs.
Purpose of the Study:
- To synthesize and characterize two isomorphic DyIII dimers with varying substituents.
- To investigate the impact of ligand substituents on the SMM behavior of DyIII dimers.
- To correlate structural differences with observed magnetic properties.
Main Methods:
- Synthesis of two DyIII dimers: [Dy2(bfbpen)2(H2O)2]·2I- (1) and [Dy2(bcbpen)2(H2O)2]·2I-·0.5H2O (2).
- Magnetic investigations including dynamic magnetic relaxation studies.
- Ab initio calculations to rationalize magnetic behavior.
Main Results:
- Both compounds exhibit SMM behavior with distinct energy barriers: 20.9 K for 1 and 72.7 K for 2 (zero dc field).
- Compound 2 shows stronger uniaxial anisotropy and magnetic exchange compared to compound 1.
- Ab initio calculations support the observed differences in magnetic performance.
Conclusions:
- Deliberate manipulation of local crystal structures through ligand design can effectively enhance SMM behavior in DyIII compounds.
- The chloro-substituted ligand in compound 2 leads to improved SMM performance over the fluoro-substituted ligand in compound 1.
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