A nickel(II)-manganese(II)-azido layered coordination polymer showing a three-dimensional ferrimagnetic order at 35 K
A nickel(II)-manganese(II)-azido layered coordination polymer showing a three-dimensional ferrimagnetic order at 35 K
复制标题
镍(II)-锰(II)-叠氮层状配位聚合物在 35 K 下呈现三维亚铁磁有序
DOI：
10.1039/c7dt04032f
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发表时间：
2018
影响因子：
4
通讯作者：
Mohanta Sasankasekhar
中科院分区：
文献类型：
--
作者：
Ghosh Sagar;Roy Shuvayan;Liu Cai-Ming;Mohanta Sasankasekhar
本文报道了一个二维叠氮桥联的NiIIMnII异金属配位聚合物[{（NiIILMnII）2（μ 1，1，3-N3）2}（μ 1，3-N3）2]n（1）的合成、表征、晶体结构和磁性。在1中，两个双（μ-苯氧）-μ 1，1，3-叠氮基-NiIIMnII双核单元相互连接形成双核二聚体{NiIIMnII}2，{NiIIMnII}2结构单元之间通过μ 1，3-叠氮基配体进一步相互连接形成层状配位聚合物。在冷却时，χMT产物从300 K缓慢降低到约100 K，然后从100 K时的3.74 cm 3 K mol-1突然增加到30 K时的113.2 cm 3 K mol-1，表明亚铁磁行为;通过ZFC-FC测量和AC测量中的发散确定低于37 K的三维磁序，其中在不同频率下同相的峰值温度35 K表明居里温度为35 K，而异相由于玻璃态磁体行为而在某种程度上与频率有关。标题化合物是磁有序居里温度高于30 K的金属有机体系的罕见例子之一。其他有趣的方面1关于磁性和结构特征进行了讨论。
The work in this report describes the synthesis, characterization, crystal structure and magnetic properties of a two-dimensional azido-bridged NiIIMnII heterometallic coordination polymer, [{(NiIILMnII)2(μ1,1,3-N3)2}(μ1,3-N3)2]n (1), in which the H2L Schiff base is the [2 + 1] condensation product of 3-methoxysalicylaldehyde and 1,3-diaminopropane. In 1, two bis(μ-phenoxo)-μ1,1,3-azido-NiIIMnII dinuclear units are interlinked to form a dimer-of-dinuclear moiety {NiIIMnII}2; the {NiIIMnII}2 structural units are further interlinked with each other by μ1,3-azido ligands to form a layered coordination polymer. Upon cooling, the χMT product slowly decreases from 300 K to about 100 K, then increases abruptly from 3.74 cm3 K mol−1 at 100 K to 113.2 cm3 K mol−1 at 30 K, indicating a ferrimagnetic behaviour; a three-dimensional magnetic order below 37 K was determined by the divergence in the ZFC-FC measurements and ac measurements, in which the peak temperature 35 K in the in-phase at different frequencies suggests that the Curie temperature is 35 K, whereas the out-of-phase is somewhat frequency dependent, due to the glassy magnet behaviour. The title compound is among the rare examples of metallo-organic systems having a magnetic ordering Curie temperature above 30 K. Other interesting aspects in 1 regarding magnetic properties and structural features are discussed.