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Slow Relaxation of the Magnetization on Frustrated Triangular FeIII Units with S = 1/2 Ground State: The Effect of the Highly Ordered Crystal Lattice and the Counteranions∇
Crystal Growth & Design ( IF 3.8 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.cgd.1c00640 Walter Cañón-Mancisidor 1, 2, 3 , Patricio Hermosilla-Ibáñez 2, 4 , Evgenia Spodine 2, 3 , Verónica Paredes-García 2, 5 , Carlos J. Gómez-García 6 , Guillermo Mínguez Espallargas 6 , Diego Venegas-Yazigi 2, 4
Crystal Growth & Design ( IF 3.8 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.cgd.1c00640 Walter Cañón-Mancisidor 1, 2, 3 , Patricio Hermosilla-Ibáñez 2, 4 , Evgenia Spodine 2, 3 , Verónica Paredes-García 2, 5 , Carlos J. Gómez-García 6 , Guillermo Mínguez Espallargas 6 , Diego Venegas-Yazigi 2, 4
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In order to understand how the different arrangements of highly ordered triangular FeIIIS = 1/2 systems with various types of diamagnetic and paramagnetic anions affect their static and dynamic magnetic properties, we have obtained by solvothermal synthesis four new μ3-oxido trinuclear FeIII compounds: [Fe3O(Ac)6(AcNH2)3][BF4]·(CH3CONH2)0.5(H2O)0.5 (1-BF4), [Fe3O(Ac)6(AcNH2)3][GaCl4] (1-GaCl4), [Fe3O(Ac)6(AcNH2)3][FeCl4] (1-FeCl4), and [Fe3O(Ac)6(AcNH2)3][FeBr4] (1-FeBr4), where Ac– = CH3COO– and AcNH2 = CH3CONH2. The organization of the triangular units is very varied, from segregated stacks to eclipsed equilateral triangular [Fe3O]+ units along the c-axis with intercalated [MX4]− units. The ordering of the triangular species, together with disposition of the counteranions (intercalated or not), affects the static and dynamic magnetic properties of the [Fe3O]+ systems. Magnetic dc data also were satisfactorily fitted with a HDvV spin Hamiltonian, considering the existence of anisotropic phenomena (antisymmetric exchange and intermolecular interactions), in order to model the low-temperature region. From the antisymmetric exchange, we were able to obtain Δ(Ueff), which was used to model and rationalize the dynamic magnetic properties of these systems, reflecting that Orbach and Raman processes define the relaxation mechanism of these systems.
中文翻译：
S = 1/2 基态的受阻三角形 FeIII 单元的磁化缓慢弛豫：高有序晶格和反阴离子的影响∇
为了了解具有各种类型的抗磁性和顺磁性阴离子的高度有序三角形Fe III S = 1 / 2系统的不同排列如何影响其静态和动态磁性，我们通过溶剂热合成获得了四种新的μ 3 -氧化三核Fe III类化合物：[Fe 3 O(Ac) 6 (AcNH 2 ) 3 ][BF 4 ]·(CH 3 CONH 2 ) 0.5 (H 2 O) 0.5 ( 1-BF 4 )，[Fe 3 O(Ac)6 (AcNH 2 ) 3 ][GaCl 4 ] ( 1-GaCl 4 )，[Fe 3 O(Ac) 6 (AcNH 2 ) 3 ][FeCl 4 ] ( 1-FeCl 4 )，和[Fe 3 O(Ac) ) 6 (AcNH 2 ) 3 ][FeBr 4 ] ( 1-FeBr 4 )，其中 Ac – = CH 3 COO –和 AcNH 2 = CH 3 CONH 2. 三角形单元的组织是多种多样的，从分离的堆叠到沿c轴重叠的等边三角形 [Fe 3 O] +单元和插入的 [MX 4 ] -单元。三角形物质的排序以及抗衡阴离子的布置（插入或不插入）会影响 [Fe 3 O] +系统的静态和动态磁性能。考虑到各向异性现象（反对称交换和分子间相互作用）的存在，磁直流数据也令人满意地符合 HDvV 自旋哈密顿量，以便模拟低温区域。从反对称交换中，我们能够得到 Δ(U eff )，用于对这些系统的动态磁特性进行建模和合理化，反映了奥尔巴赫和拉曼过程定义了这些系统的弛豫机制。
更新日期：2021-11-03
中文翻译：
S = 1/2 基态的受阻三角形 FeIII 单元的磁化缓慢弛豫：高有序晶格和反阴离子的影响∇
为了了解具有各种类型的抗磁性和顺磁性阴离子的高度有序三角形Fe III S = 1 / 2系统的不同排列如何影响其静态和动态磁性，我们通过溶剂热合成获得了四种新的μ 3 -氧化三核Fe III类化合物：[Fe 3 O(Ac) 6 (AcNH 2 ) 3 ][BF 4 ]·(CH 3 CONH 2 ) 0.5 (H 2 O) 0.5 ( 1-BF 4 )，[Fe 3 O(Ac)6 (AcNH 2 ) 3 ][GaCl 4 ] ( 1-GaCl 4 )，[Fe 3 O(Ac) 6 (AcNH 2 ) 3 ][FeCl 4 ] ( 1-FeCl 4 )，和[Fe 3 O(Ac) ) 6 (AcNH 2 ) 3 ][FeBr 4 ] ( 1-FeBr 4 )，其中 Ac – = CH 3 COO –和 AcNH 2 = CH 3 CONH 2. 三角形单元的组织是多种多样的，从分离的堆叠到沿c轴重叠的等边三角形 [Fe 3 O] +单元和插入的 [MX 4 ] -单元。三角形物质的排序以及抗衡阴离子的布置（插入或不插入）会影响 [Fe 3 O] +系统的静态和动态磁性能。考虑到各向异性现象（反对称交换和分子间相互作用）的存在，磁直流数据也令人满意地符合 HDvV 自旋哈密顿量，以便模拟低温区域。从反对称交换中，我们能够得到 Δ(U eff )，用于对这些系统的动态磁特性进行建模和合理化，反映了奥尔巴赫和拉曼过程定义了这些系统的弛豫机制。
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