Abstract

Two earlier described polymorphous modifications of the cobalt(II) (pseudo)clathrochelate are studied by EPR spectroscopy in the terahertz range, where the complex exhibits the properties of a single-molecule magnet (including the record-breaking barrier for magnetization reversal at the moment). Different values of the magnetization reversal barrier found previously for the corresponding crystalline phases by the results of magnetometric measurements in an alternating magnetic field are observed in the EPR spectra in the terahertz range. A combined analysis of these two methods allows one to more precisely estimate the magnetization reversal barrier for two polymorphous modifications and also the contribution of different magnetic relaxation mechanisms to the spin dynamics. This unambiguously confirms that slight changes in the crystalline environment of the molecule of even such structurally rigid metal complexes as cobalt(II) (pseudo)clathrochelates can result in high differences in the magnetization reversal barrier, which is the key characteristic of single-molecule magnets.

中文翻译：

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根据太赫兹范围内的EPR光谱数据，多态性对单分子磁体磁性能的影响

摘要

通过太平赫兹范围内的EPR光谱研究了钴（II​​）（假）chel螯合物钴的两个先前描述的多晶型修饰，其中该复合物表现出单分子磁体的特性（包括目前磁化反转的破纪录障碍） ）。在太赫兹范围内的EPR光谱中，可以观察到先前通过交变磁场中的磁力测量结果在相应的结晶相中发现的不同的磁化反转势垒值。对这两种方法的组合分析使人们可以更精确地估计两个多态性修饰的磁化反转势垒，以及不同的磁弛豫机制对自旋动力学的贡献。