A Three-Dimensional Coordination Framework with a Ferromagnetic Coupled Ni(II)-CrO4 Layer: Synthesis, Structure, and Magnetic Studies

Polymers

Kwai-Kong Ng¹  Hsu-Yen Tang²  Chen-I Yang²  Gene-Hsiang Lee³ 

[1] Department of Applied Physics, Tunghai University, Taichung 407, Taiwan;Department of Chemistry, Tunghai University, Taichung 407, Taiwan;Instrumentation Center, National Taiwan University, Taipei 106, Taiwan;

关键词: magnetic coordination polymer;    chromate-bridge;    pillar-layered network;    ferromagnetic;    antiferromagnetic;    magnetic ordering;   

DOI  :  10.3390/polym14091735

来源: DOAJ

【 摘 要 】

We report herein on the crystal structure and magnetic studies of a three-dimensional (3D) Ni(II)-chromate coordination polymer, [Ni(CrO₄)(bpym)(H₂O)]_n (1; bpym = 5,5′-bipyrimidin), prepared by self-assembly of Ni(II) and chromate ions with a multi-N donor auxiliary ligands, bpym, through hydrothermal processes. The structure of 1 is composed of Ni(II)-CrO₄ layers with [Ni₃(μ₃-CrO₄)] triangular motifs, in which the Ni(II) centers are bridged by O′:O′:O′:μ₃-CrO₄²⁻ anions, and the resulting layers are further connected by twisted trans-μ₂-N,N′-bpym auxiliary ligands to form a 3D pillar-layered network with an hms topology. The magnetic properties of compound 1 were illustrated by variable field and temperature magnetic susceptibility measurements. The findings reveal that compound 1 shows intralayer ferromagnetic interactions within Ni(II)-CrO₄ layers, and furthers the 3D antiferromagnetic ordering in the resulting of interlayer antiferromagnetic couplings with a Néel temperature (T_N) of 5.6 K. In addition, compound 1 shows the field-induced metamagnetic behavior at temperature below the T_N.

【 授权许可】

Unknown