A mononuclear five- coordinate Co( II) single molecule magnet with a spin crossover between the S=1/ 2 and 3/ 2 states+
A mononuclear five- coordinate Co( II) single molecule magnet with a spin crossover between the S=1/ 2 and 3/ 2 states+
复制标题
具有 S=1/2 和 3/2 态之间自旋交叉的单核五配位 Co(II) 单分子磁体
DOI：
10.1039/c8dt03783c
复制
发表时间：
2018-12-14
影响因子：
4
通讯作者：
Ouyang, Zhong-Wen
中科院分区：
文献类型：
--
作者：
Chen, Lei;Song, Jingbo;Ouyang, Zhong-Wen
虽然已经发现了大量的单离子磁体（西姆斯）和自旋交叉（SCO）化合物，但具有SCO和SIM性质的多功能材料非常稀缺。本文对一个单核的、五配位的四棱锥构型的钴（Ⅱ）配合物[Co（3，4-lut）（4）Br]Br（1）进行了磁性研究。直流磁测量证实了在150-290 K范围内S = 1/2和3/2态之间的自旋转变，具有小的磁滞回线。频率和温度依赖的交流磁化率揭示了缓慢的磁化弛豫下施加的直流磁场为3000 Oe。这里的工作提出了第一个实例的五坐标单核钴（II）为基础的SIM表现出热诱导完整的SCO。
Although a great number of single-ion magnets (SIMs) and spin-crossover (SCO) compounds have been discovered, multifunctional materials with the combination of SCO and SIM properties are extremely scarce. Here magnetic studies have been carried out for a mononuclear, five-coordinate cobalt(ii) complex [Co(3,4-lut)(4)Br]Br (1) with square pyramidal geometry. Direct-current magnetic measurement confirms the spin transition between the S = 1/2 and 3/2 states in the range of 150-290 K with a small hysteresis loop. Frequency- and temperature-dependent alternating-current magnetic susceptibility reveals slow magnetization relaxation under an applied dc field of 3000 Oe. The work here presents the first instance of the five-coordinate mononuclear cobalt(ii)-based SIM exhibiting the thermally induced complete SCO.