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氧化还原活性四氧杂环戊烯桥连双镧系配合物中的交换耦合和单分子磁性

Exchange coupling and single molecule magnetism in redox-active tetraoxolene-bridged dilanthanide complexes.

作者信息

Zhang Peng, Perfetti Mauro, Kern Michal, Hallmen Philipp P, Ungur Liviu, Lenz Samuel, Ringenberg Mark R, Frey Wolfgang, Stoll Hermann, Rauhut Guntram, van Slageren Joris

机构信息

Institut für Physikalische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 , Stuttgart , Germany . Email:

Department of Chemistry , University of Copenhagen , Universitetparken 5 , 2100 Copenhagen , Denmark.

出版信息

Chem Sci. 2017 Dec 8;9(5):1221-1230. doi: 10.1039/c7sc04873d. eCollection 2018 Feb 7.

DOI:10.1039/c7sc04873d
PMID:29675167
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5885778/
Abstract

Tetraoxolene radical-bridged lanthanide SMM systems were prepared for the first time by reduction of the respective neutral compounds. Magnetic measurements reveal the profound influence of the radical center on magnetic behavior. Strong magnetic couplings are revealed in the radical species, which switch on SMM behavior under zero applied field for Dy and Tb compounds. HFEPR spectra unravel the contributions of the magnetic coupling and the magnetic anisotropy. For Gd this results in much more accurate magnetic coupling parameters with respect to bulk magnetic measurements.

摘要

首次通过还原相应的中性化合物制备了四氧杂环戊烯自由基桥联的镧系单分子磁体体系。磁性测量揭示了自由基中心对磁行为的深远影响。在自由基物种中发现了强磁耦合，对于Dy和Tb化合物，在零外场下开启了单分子磁体行为。高频电子顺磁共振光谱揭示了磁耦合和磁各向异性的贡献。对于Gd，相对于体磁测量，这导致了更精确的磁耦合参数。

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