Yang Qianqian, Meng Yin-Shan, Liu Tao, Tang Jinkui
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefe 230026, P. R. China.
Dalton Trans. 2022 Jan 4;51(2):602-607. doi: 10.1039/d1dt03664e.
Two new iron(II) complexes Fe(bppCHO) (1·ClO4) and Fe(bppCHO)·HO (1·BF4) were synthesized by using 2,6-di(1-pyrazol-1-yl)isonicotinaldehyde (bppCHO) as the ligand. The structures and spin states of the complexes were characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. Complex 1·ClO4 exhibits light-induced excited spin state trapping (LIESST) up to 53 K and two-step spin-crossover (SCO) over room temperature, in which the first step shows a thermal hysteresis of 26 K, whereas 1·BF4 exhibits a gradual SCO behavior. A magnetostructural study reveals that the difference in the SCO property is related to the supramolecular interactions and crystal packing effect.
通过使用2,6-二（1-吡唑-1-基）异烟酸醛（bppCHO）作为配体，合成了两种新的铁（II）配合物Fe(bppCHO)（1·ClO₄）和Fe(bppCHO)·H₂O（1·BF₄）。通过单晶X射线衍射和磁化率测量对配合物的结构和自旋态进行了表征。配合物1·ClO₄在高达53 K时表现出光诱导激发自旋态捕获（LIESST），并且在室温以上呈现两步自旋交叉（SCO），其中第一步显示出26 K的热滞回，而1·BF₄表现出逐渐的SCO行为。磁结构研究表明，SCO性质的差异与超分子相互作用和晶体堆积效应有关。
