Spin crossover behavior in two-dimensional bimetallic coordination polymer FeII(3-bromo-4-picoline)2[AuI(CN)2]2: Synthesis, crystal structures, and magnetic properties
Spin crossover behavior in two-dimensional bimetallic coordination polymer FeII(3-bromo-4-picoline)2[AuI(CN)2]2: Synthesis, crystal structures, and magnetic properties
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二维双金属配位聚合物 FeII(3-bromo-4-picoline)2[AuI(CN)2]2 中的自旋交叉行为：合成、晶体结构和磁性
DOI：
10.1016/j.poly.2008.11.042
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发表时间：
2009
期刊：
影响因子：
2.6
通讯作者：
T. Kitazawa
中科院分区：
文献类型：
--
作者：
T. Kosone;C. Kanadani;Toshiaki Saito;T. Kitazawa
合成了一种基于 3-bromo-4-picoline 和桥联氰基配体的新型二维网络双金属 FeIIAuIspin 交叉配位化合物 {FeII(3-bromo-4-picoline)2[AuI(CN)2]2}n(1)，并通过元素分析和红外、293K 和 90K 的单晶 X 射线分析以及磁测量进行表征。 1中的FeII离子具有八面体FeN6配位几何形状，它们通过赤道面上的[AuI(CN)2]-单元连接，形成聚合的2D片状结构。两个吡啶环在轴向位置上协调。 1 的结构由平行的二维阵列组成，各层成对相互作用，定义了具有强双核亲金 Au⋯Au 相互作用的双层。此外，1 中的 Au⋯Br 和 Br⋯Br 分子间距离明显小于范德华半径之和。对 1 进行变温 (2–300K) 磁化率测量以确定自旋跃迁的行为。磁化率数据1表明大约50%的HS状态在75K时转变为LS状态。 90K 时的 Fe-N 键距表明高自旋态的比例与 SQUID 数据一致。
A new novel 2D network bimetallic FeIIAuIspin crossover coordination compound based on 3-bromo-4-picoline and bridged cyano ligands, {FeII(3-bromo-4-picoline)2[AuI(CN)2]2}n(1), has been synthesized and characterized by elemental analyses and IR, using single-crystal X-ray analysis at 293K and at 90K and magnetic measurements. The FeIIions in 1 have octahedral FeN6coordination geometries, which are linked by a [AuI(CN)2]−unit at the equatorial plane to form a polymeric 2D sheet architecture. The two pyridine rings coordinate at the axial positions. The structure of 1 comprises parallel 2D arrays and the layers interact by pairs, defining bilayers with strong binuclear aurophilic Au⋯Au interactions. Furthermore, intermolecular Au⋯Br and Br⋯Br distances in 1 are significantly smaller than the sums of the van der Waals radii. Variable-temperature (2–300K) magnetic susceptibility measurements of 1 have been performed to determine behaviors of spin transition. The susceptibility data of 1 indicates that about 50% of the HS states are changed to LS states at 75K. The Fe–N bond distances at 90K show that ratio of high spin states agree with the SQUID data.