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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Two 3d-4f double helical chains including [Dy2M2](n) (M = Ni-II and Co-II) cores exhibiting slow magnetic relaxation
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Two 3d-4f double helical chains including [Dy2M2](n) (M = Ni-II and Co-II) cores exhibiting slow magnetic relaxation

机译：两个3d-4f双螺旋链，包括[Dy2M2]（n）（M = Ni-II和Co-II）核，表现出缓慢的磁弛豫

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摘要

Two new 3d-4f heterometallic 1D chains of formulae {[Dy2M2L4(NO3)(H2O)(3)][Dy2M2L4(NO3)(CH3COO)-(H2O)(2)]center dot NO3 center dot 12H(2)O center dot 2C(2)H(5)OH}(n) [M = Ni (1); Co (2)] have been prepared using the multidentate ligand 2-{[(2-hydroxy-3-methoxyphenyl)methylidene]amino}benzoic acid (H2L), which has NO and OO' chelating pockets that are able to selectively encapsulate Ln(III) and transition metal ions, respectively. Crystal structure analyses reveal that the two complexes are isostructural and display one-dimensional ladder like double helical chain structures, in which the two single helical chains {[Dy2M2L4(NO3)(H2O)(3)](+)} and {Dy2M2L4(NO3)(CH3COO)(H2O)(2)} (M = Ni(1), Co(2)) both run along the c-axis and have opposite chirality. Complexes 1 and 2 represent the first example of 3d-4f double-chain frameworks in which the compositions of the two individual chains are different. Variable temperature dc magnetic susceptibility studies reveal different strengths of ferromagnetic interactions between the magnetic centers in 1 and 2, which is mainly attributed to the different metal centers and finally results in the distinctive magnetic dynamic behaviors.
机译：两条新的分子式为{{Dy2M2L4（NO3）（H2O）（3）] [Dy2M2L4（NO3）（CH3COO）-（H2O）（2）]的3d-4f杂金属1D中心点NO3中心点12H（2）O中心点2C（2）H（5）OH}（n）[M = Ni（1）;使用多齿配体2-{[（（2-羟基-3-甲氧基苯基）亚甲基]氨基}苯甲酸（H2L）制备了Co（2）]，该多齿配体具有NO和OO'螯合口袋，能够选择性地封装Ln （III）和过渡金属离子。晶体结构分析表明，这两个络合物是同构结构，并显示出一维阶梯状的双螺旋链结构，其中两个单螺旋链{[Dy2M2L4（NO3）（H2O）（3）]（+）}和{Dy2M2L4（ NO3）（CH3COO）（H2O）（2）}（M = Ni（1），Co（2））均沿c轴运行并且具有相反的手性。配合物1和2代表3d-4f双链构架的第一个例子，其中两条独立链的组成不同。可变温度直流磁化率研究表明，在1和2的磁性中心之间，铁磁相互作用的强度不同，这主要归因于不同的金属中心，最终导致了独特的磁性动力学行为。

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