Tang Hsu-Yen, Lee Gene-Hsiang, Ng Kwai-Kong, Yang Chen-I
Department of Chemistry, Tunghai University, Taichung 407, Taiwan.
Instrumentation Center, National Taiwan University, Taipei 106, Taiwan.
Polymers (Basel). 2022 Apr 24;14(9):1735. doi: 10.3390/polym14091735.
We report herein on the crystal structure and magnetic studies of a three-dimensional (3D) Ni(II)-chromate coordination polymer, [Ni(CrO)(bpym)(HO)] (; bpym = 5,5'-bipyrimidin), prepared by self-assembly of Ni(II) and chromate ions with a multi- donor auxiliary ligands, bpym, through hydrothermal processes. The structure of is composed of Ni(II)-CrO layers with [Ni(-CrO)] triangular motifs, in which the Ni(II) centers are bridged by ':':':-CrO anions, and the resulting layers are further connected by twisted --,'-bpym auxiliary ligands to form a 3D pillar-layered network with an topology. The magnetic properties of compound were illustrated by variable field and temperature magnetic susceptibility measurements. The findings reveal that compound shows intralayer ferromagnetic interactions within Ni(II)-CrO layers, and furthers the 3D antiferromagnetic ordering in the resulting of interlayer antiferromagnetic couplings with a Néel temperature () of 5.6 K. In addition, compound shows the field-induced metamagnetic behavior at temperature below the .
我们在此报告一种三维（3D）镍（II）-铬酸盐配位聚合物[Ni(CrO)(bpym)(HO)]（；bpym = 5,5'-联嘧啶）的晶体结构和磁性研究，该聚合物通过镍（II）和铬酸根离子与多齿辅助配体bpym通过水热法自组装制备而成。的结构由具有[Ni(-CrO)]三角形 motif 的镍（II）-CrO 层组成，其中镍（II）中心由':':':-CrO 阴离子桥连，所得层通过扭曲的--,'-bpym 辅助配体进一步连接形成具有拓扑结构的 3D 柱状层网络。通过变场和变温磁化率测量对化合物的磁性进行了说明。研究结果表明，化合物在镍（II）-CrO 层内表现出层内铁磁相互作用，并在层间反铁磁耦合作用下进一步产生三维反铁磁有序，奈尔温度（）为 5.6 K。此外，化合物在低于的温度下表现出场诱导的变磁行为。
