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Slow relaxation of magnetization in lanthanide–biradical complexes based on a functionalized nitronyl nitroxide biradical
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-13 , DOI: 10.1039/d0dt03312j
Juan Sun 1, 2, 3, 4, 5 , Qi Wu 1, 2, 3, 4, 5 , Jiao Lu 6, 7, 8, 9, 10 , Pei Jing 6, 7, 8, 9, 10 , Yeshuang Du 1, 2, 3, 4, 5 , Licun Li 6, 7, 8, 9, 10
Affiliation  

Three novel lanthanide–biradical complexes {[Ln(hfac)3]2(mbisNITPyPh)(H2O)}{[Ln(hfac)3](mbisNITPyPh)}·CHCl3 (1-Gd; 2-Tb; 3-Dy) were successfully achieved by reacting the biradical mbisNITPyPh (5-(3-pyridyl)-1,3-bis(1-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene) with Ln(hfac)3·2H2O (hfac = hexafluoroacetylacetonate). These Ln–biradical complexes consist of two kinds of spin moieties, namely, dinuclear {[Ln(hfac)3]2(mbisNITPyPh)(H2O)} and mononuclear {[Ln(hfac)3](mbisNITPyPh)}, in which two adjacent dinuclear units are linked by intermolecular hydrogen bonds involving the uncoordinated nitroxide units and the coordinated water molecules of Ln ions, forming a cyclic tetranuclear structure unit. The magnetization study reveals that intramolecular Ln(III)-coordinated NO ferromagnetic interactions are dominant in the present system. Moreover, the clear frequency dependence of ac magnetic susceptibilities of complex 3-Dy is indicative of slow relaxation of magnetization behavior, indicating its single-molecule magnet nature.

中文翻译:

镧系元素-双自由基复合物基于官能化的硝酰基-氮氧化物双自由基的磁化慢弛豫

三种新型镧系元素-双自由基络合物{[Ln(hfac)3 ] 2m bisNITPyPh)(H 2 O)} {[Ln(hfac)3 ](m bisNITPyPh)}·CHCl 31-Gd ; 2-Tb ;通过使双自由基m bisNITPyPh(5-(3-吡啶基)-1,3-bis(1-oxyl-3'-oxido-4',4',5',5'-四甲基)反应成功获得3-Dy)-4,5-氢-1 H-咪唑-2-基)苯)与Ln(hfac)3 ·2H 2 O(hfac =六氟乙酰丙酮)。这些Ln-双自由基络合物由两种自旋部分组成,即双核{[Ln(hfac)3 ]2 m bisNITPyPh)(H 2 O)}和单核{[Ln(hfac) 3 ]( m bisNITPyPh)},其中两个相邻的双核单元通过分子间氢键连接,该分子间氢键涉及未配位的氮氧化物单元和配位的水分子。 Ln离子,形成环状四核结构单元。磁化研究表明,分子内的Ln( III)配位的NO铁磁相互作用在本系统中占主导地位。此外,复合物3-Dy的ac磁化率的明显频率依赖性指示了磁化行为的缓慢松弛,表明了其单分子磁体性质。
更新日期:2020-11-21
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