脱水对六核锰单分子磁体磁性的影响

摘要

以水杨醛肟和Mn(CH3COO)2·4H2O为原料,合成了一个新的六核锰簇合物[Mn6O2(CH3COO)2(salox)6(H2O)4]· 10H2O(salox2-表示负二价的水杨醛肟),对其进行了单晶X射线衍射分析及脱水前后样品的直流和交流磁性测试.结果表明,该簇合物是一个反铁磁性单分子磁体,脱水使得六核锰簇内的反铁磁作用增强,磁弛豫能垒下降,但簇合物仍保持单分子磁体的性质.%A hexanuclear manganese cluster [Mn6O2(CH3COO)2(salox)6(H2O)4] · 10H2O (salox2- is the dianion of salicylaldoxime) was synthesized using salicylaldoxime and manganese acetate as raw materials, and its X-ray single crystal diffraction analysis and dc and ac magnetic measurements for the samples before and after dehydration were performed. The results show that, the cluster is an anti-ferromagnetic single-molecule magnet, and dehydration makes intra-cluster anti-ferromagnetic interactions and the energy barrier for the relaxation of the magnetization become stronger and decrease, respectively whereas the cluster retains single-molecule-magnet-like behavior. CCDC: 822907.