Ji Liudi, Wang Juntao, Li Zeyu, Zhu Xiaoming, Hu Peng
School of Nuclear Technology and Chemistry and Biology, Hubei University of Science and Technology, Xianning 437100, China.
Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Hubei University of Science and Technology, Xianning 437100, China.
Molecules. 2024 Jul 12;29(14):3304. doi: 10.3390/molecules29143304.
Two enantiomeric pairs of new 3d-4f heterometallic clusters have been synthesized from two enantiomer Schiff base derivatives: (/)-2-[(2-hydroxy-1-phenylethylimino)methyl] phenol (-/-HL). The formulae of the series clusters are CoLn(-L) (Ln = Dy (), Gd ()), CoLn (-L) (Ln = Dy (), Gd ()), whose crystal structures and magnetic properties have been characterized. Structural analysis indicated that the above clusters crystallize in the chiral 23 group space. The central lanthanide ion has a coordination geometry of surrounded by three [Co(L)] anions using six aliphatic oxygen atoms of L featuring a star-shaped [CoLn] configuration. Magnetic measurements showed the presence of slow magnetic relaxation with an effective energy barrier of 22.33 K in the Dy derivatives under a zero-dc field. Furthermore, the circular dichroism (CD) spectra of and confirmed their enantiomeric nature.
（/）-2-[(2-羟基-1-苯乙基亚氨基)甲基]苯酚（-/-HL），合成了两对新的3d-4f异金属簇。该系列簇的化学式为CoLn(-L)（Ln = Dy（），Gd（）），CoLn (-L)（Ln = Dy（），Gd（）），其晶体结构和磁性已得到表征。结构分析表明，上述簇在手性23群空间中结晶。中心镧系离子具有由三个[Co(L)]阴离子利用L的六个脂肪族氧原子包围的配位几何结构，呈现出星形[CoLn]构型。磁性测量表明，在零直流场下，Dy衍生物中存在有效能垒为22.33 K的慢磁弛豫。此外，和的圆二色性（CD）光谱证实了它们的对映体性质。
