Self-assembled three-dimensional molecule-based magnet composed of a trinuclear manganese unit and octacyanidotungstate
Self-assembled three-dimensional molecule-based magnet composed of a trinuclear manganese unit and octacyanidotungstate
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由三核锰单元和八氰钨酸盐组成的自组装三维分子基磁体
DOI：
10.1016/j.ica.2019.01.009
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发表时间：
2019
影响因子：
2.8
通讯作者：
Ohkoshi Shin-ichi
中科院分区：
文献类型：
--
作者：
Komine Masaya;Nakabayashi Koji;Stefanczyk Olaf;Ohkoshi Shin-ichi
本文报道了一种三维分子基磁体[MnII_3（4-吡啶酮）_6][WV（CN）_8]_2·2H_2O。该化合物是通过蒸发MnCl 2·4 H2O、4-羟基吡啶和Cs3[W（CN）8]·2 H2O的水溶液一锅合成的。蒸发过程导致结构单元的自组装，形成三维网络结构，其中独特的三锰单元[Mn 3（4-吡啶酮）6]6+由[W（CN）8]3−阴离子桥接。该化合物具有两种类型的短金属间桥，它们可以表现出两种磁性相互作用途径（MnII-O-MnII和MnII-NC-WV）。WV（S= 1/2）和MnII（S= 5/2）之间以及MnII和MnII之间的磁相互作用是反铁磁的，交换耦合常数分别为JMnW = −3.9 cm− 1和JMnMn = −5.9 cm−1。本发明化合物显示亚铁磁性，其自发磁化强度低于20 K。
We report a three-dimensional molecule-based magnet, [MnII3(4-pyridone)6][WV(CN)8]2·2H2O. This compound was synthesized in one-pot by evaporation of an aqueous solution in which MnCl2·4H2O, 4-hydroxypyridine and Cs3[W(CN)8]·2H2O were dissolved. The evaporation process causes self-assembly of the building blocks, forming a three-dimensional network structure with unique trimanganese units of [Mn3(4-pyridone)6]6+bridged by [W(CN)8]3−anions. This compound has two types of short intermetallic bridges, which can exhibit two magnetic interaction pathways (MnII-O-MnIIand MnII-NC-WV). The magnetic interactions between WV(S= 1/2) and MnII(S= 5/2) and between MnIIand MnIIare antiferromagnetic with exchange coupling constants ofJMnW= −3.9 cm−1andJMnMn= −5.9 cm−1, respectively. The present compound exhibits ferrimagnetism with spontaneous magnetization below 20 K.