Synthesis, Structural Characterization, and Magnetic Properties of Two Iron(II) Complexes With Triazole- and Imidazole-Related Ligands

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry Pub Date : 2016-04-18 DOI:10.1080/15533174.2015.1137056

Qingqing Liu, Li-Jing Yang, Yang‐Hui Luo, Wen Wang, Yang Ling, Baiwang Sun

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Abstract

Two new mononuclear iron (II) coordination complexes: Fe(L1)2(SCN)2 (1, L1:5-dimethylether-4-(4-methylphenyl)-3-(2-pyridinyl)-1,2,4-triazole) and Fe(L2)3(ClO4)2 (2, L2 :1-ethyl acetate-2-(2-pyridinyl)-imidazole), for the exploration of spin-crossover compounds have been synthesized and characterized. Structural analysis revealed that the framework of complex 1 is featured with 1-D chain structure connected by weak π···π interactions between the adjacent L1 ligands, while complex 2 featured with various kinds of weak intermolecular hydrogen bonding interactions between Fe(L2)32+ cation and ClO4− anion, which lead to a close crystal packing. The intermolecular interactions have shown a significant influence on the physical properties, and magnetic measurements of complexes 1 and 2 in the solid state at the room temperature revealed that the weak intermolecular interactions in 1 resulted in HS (high-spin) state, while the strong interactions in 2 lead to LS (low-spin) state over the whole temperature range.

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两种与三唑和咪唑相关配体的铁(II)配合物的合成、结构表征和磁性能

合成了两个新的单核铁(II)配位配合物Fe(L1)2(SCN)2 (1,l1:5-二甲基醚-4-(4-甲基苯基)-3-(2-吡啶基)-1,2,4-三唑)和Fe(L2)3(ClO4)2 (2,l2:1-乙酸乙酯-2-(2-吡啶基)-咪唑)，用于自旋交叉化合物的探索。结构分析表明，配合物1的骨架具有一维链结构，由相邻L1配体之间的弱π··π相互作用连接，而配合物2的骨架具有Fe(L2)32+阳离子与ClO4−阴离子之间的各种弱氢键相互作用，导致晶体紧密排列。分子间相互作用对配合物的物理性质有显著影响，配合物1和配合物2在室温下的固态磁性测量结果表明，在整个温度范围内，配合物1中的弱相互作用导致高自旋态HS，而配合物2中的强相互作用导致低自旋态LS。

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