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Tuning slow magnetic relaxation behaviour in a {Dy2}-based one-dimensional chain via crystal field perturbation

机译:通过水晶场扰动在{DY2}的一维链中调整缓慢磁松弛行为

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Two novel {Dy _(2) }-based one dimensional chain compounds {[Dy _(2) (H _(3) L) _(4) (OAc) _(6) ]·2MeOH} _( n ) ( 1 ) and {[Dy _(2) (H _(3) L) _(4) (OAc) _(4) (NCS) _(2) ]·2MeOH} _( n ) ( 2 ) (H _(3) L = 1,3-bis(2-hydroxynaphthalenemethyleneamino)-propan-2-ol) have been prepared under solvothermal conditions. Crystal structure analyses indicate that 1 and 2 feature similar 1D chain structures bearing dinuclear secondary building units. The difference between these two structures is that one chelated acetate ligand of Dy( III ) ion in 1 is replaced by one monodentate coordinated NCS ~(?) ion in 2 , leading to their different coordination numbers and geometry configurations to Dy( III ) ion. Magnetic properties indicate that 1 and 2 display slow magnetic relaxation behavior with an effective energy barrier of 16.44(2) K in 1 and 8.02(2) K in 2 , respectively, which is maybe attributed to the subtle crystal field perturbation of Dy( III ) ions.
机译:三个新颖的{dy _(2)},一维链化合物{[dy _(2)(h _(3)(h)(h _(3))_(4)(OAc)_(6)]·2MEOH} _(n)( 1)和{[dy _(2)(h _(3)l)_(4)(OAC)_(4)(ncs)_(2)]·2MEOH} _(n)(2)(H _ (3)L = 1,3-双(2-羟基萘甲基氨基氨基) - 在溶剂热条件下制备了-PROPAN-2-OL。晶体结构分析表明,1和2具有相似的1D链结构轴承轴承核液体构建单元。这两种结构之间的差异是,1的一个螯合醋酸酯配体在1中的一个单常规配位的NCS〜(α)离子2中,导致它们不同的配位数和几何构型到Dy(III)离子。磁性特性表明,在2中分别在1和8.02(2)k中的有效能量屏障为16.44(2)k的有效能量屏障的慢磁性放松行为,这可能归因于DY的微妙晶体扰动(III)离子。

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