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首页> 外文期刊>Chemistry: A European journal >Weak Ligand-Field Effect from Ancillary Ligands on Enhancing Single-Ion Magnet Performance
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Weak Ligand-Field Effect from Ancillary Ligands on Enhancing Single-Ion Magnet Performance

机译：辅助配体的弱配体场效应对增强单离子磁体性能的影响

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摘要

A series of bis-pentamethylcyclopentadienyl-supported Dy complexes containing different ancillary ligands were synthesized and characterized. Magnetic studies showed that 1Dy [Cp-2*DyCl(THF)], 1Dy' [Cp-2*DyCl2K(THF)](n), 2Dy [Cp-2*DyBr(THF)], 3Dy [Cp-2*DyI(THF)] and 4Dy [Cp-2*DyTp] (Tp=hydrotris(1-pyrazolyl)borate) were single-ion magnets (SIMs). The 1D dysprosium chain 1Dy' exhibited a hysteresis at up to 5 K. Furthermore, 3Dy featured the highest energy barrier (419 cm(-1)) among the complexes. The effects of ancillary ligands on single-ion magnetic properties were studied by experimental, ab initio calculations and electrostatic analysis methods in detail. These results demonstrated that the QTM rate was strongly dependent on the ancillary ligands and that a weak equatorial ligand field could be beneficial for constructing Dy-SIMs.
机译：合成并表征了一系列由不同的辅助配体组成的双双五甲基环戊二烯基负载的Dy复合物。磁性研究表明1Dy [Cp-2 * DyCl（THF）]，1Dy'[Cp-2 * DyCl2K（THF）]（n），2Dy [Cp-2 * DyBr（THF）]，3Dy [Cp-2 * DyI（THF）]和4Dy [Cp-2 * DyTp]（Tp =氢三（1-吡唑基）硼酸酯）是单离子磁体（SIMs）。 1D chain链1Dy'在最高5 K处显示出磁滞现象。此外，3Dy具有复合物中最高的能垒（419 cm（-1））。通过实验，从头算和静电分析方法详细研究了辅助配体对单离子磁性的影响。这些结果表明，QTM速率强烈依赖于辅助配体，弱的赤道配体场可能有利于构建Dy-SIM。

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