Weak Ligand-Field Effect from Ancillary Ligands on Enhancing Single-Ion Magnet Performance

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• 作者：Yin-Shan Meng ; Prof. Dr. Yi-Quan Zhang ; Prof. Dr. Zhe-Ming Wang ; Prof. Dr. Bing-Wu Wang and Prof. Dr. Song Gao
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：August 26, 2016
• 年：2016
• 卷：22
• 期：36
• 页码：12724-12731
• 全文大小：4362K
• ISSN：1521-3765

文摘

A series of bis-pentamethylcyclopentadienyl-supported Dy complexes containing different ancillary ligands were synthesized and characterized. Magnetic studies showed that 1 Dy [Cp*₂DyCl(THF)], 1 Dy’ [Cp*₂DyCl₂K(THF)]_n, 2 Dy [Cp*₂DyBr(THF)], 3 Dy [Cp*₂DyI(THF)] and 4 Dy [Cp*₂DyTp] (Tp=hydrotris(1-pyrazolyl)borate) were single-ion magnets (SIMs). The 1D dysprosium chain 1 Dy’ exhibited a hysteresis at up to 5 K. Furthermore, 3 Dy 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.