Self-assembly of the tetrachlorido(oxalato)rhenate( iv ) anion with protonated organic cations: X-ray structures and magnetic properties
Self-assembly of the tetrachlorido(oxalato)rhenate( iv ) anion with protonated organic cations: X-ray structures and magnetic properties
复制标题
四氯化(草酸)铼酸( iv )阴离子与质子化有机阳离子的自组装：X射线结构和磁性
DOI：
10.1039/c6ce02025a
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发表时间：
2017
期刊：
影响因子：
3.1
通讯作者：
Pedersen A
中科院分区：
文献类型：
--
作者：
Pedersen A
合成了两种新型的ReIV化合物[H2 bpy][ReIVCl 4（ox）]（1）和[H3 biim]2[ReIVCl 4（ox）]（2）[H2 bpy 2 + = 4，4 ′-联吡啶鎓二价阳离子，H3 biim + = 2，2 ′-联咪唑鎓一价阳离子，ox 2 − =草酸根二价阴离子]，并对其进行了磁结构表征。1在单斜晶系中结晶，空间群为C2/c，2在三斜晶系中结晶，空间群为P。1和2中的ReIV离子是六配位的，在扭曲的八面体几何结构中与四个氯离子和两个硼酸盐氧原子键合。两种化合物的晶格中都存在短的分子间ReIV-Cl Cl-ReIV接触、Cl π型相互作用和氢键，产生了基于高度各向异性的[ReIVCl 4（ox）]2−物种的新型超分子结构。1和2的磁性检查揭示了ReIV离子之间的显着的反铁磁耦合传播主要通过ReIV-Cl-Cl-ReIV相互作用，证明了在约100 ℃的磁化率的最大值的发生。12（1）和17 K（2）。
Two novel ReIV compounds of formulae [H2bpy][ReIVCl4(ox)] (1) and [H3biim]2[ReIVCl4(ox)] (2) [H2bpy2+ = 4,4′-bipyridinium dication, H3biim+ = 2,2′-biimidazolium monocation, and ox2− = oxalate dianion] have been synthesised and magneto-structurally characterised. 1 crystallises in the monoclinic system with space group C2/c, and 2 crystallises in the triclinic system with space group P. The ReIV ion in 1 and 2 is six-coordinate, bonded to four chloride ions and two oxalate-oxygen atoms in a distorted octahedral geometry. Short intermolecular ReIV–Cl⋯Cl–ReIV contacts, Cl⋯π type interactions and hydrogen bonds are present in the crystal lattice of both compounds, generating novel supramolecular structures based on the highly anisotropic [ReIVCl4(ox)]2− species. Examination of the magnetic properties of 1 and 2 reveals significant antiferromagnetic coupling between ReIV ions propagated primarily through the ReIV–Cl⋯Cl–ReIV interactions, as evidenced by the occurrence of maxima in the magnetic susceptibility at ca. 12 (1) and 17 K (2).