Dy4 and Dy5 complexes based on tautomeric hydrazone Schiff-base ligand regulated by temperature showing single-molecule magnet behaviour

• Published in: Journal of molecular structure 2024-09, Vol.1311, p.138393, Article 138393
• Main Authors: Zhong, Xiang, Hu, Zhao-Bo, Luo, Tong-Kai, Chen, Xiao-Feng, Zhang, Qing-Yun, Peng, Yan, Liu, Sui-Jun, Wen, He-Rui
• Format: Article
• Language: English
• Subjects: Effective energy barrier; Hydrazone Schiff-base ligand; Lanthanide; Single-molecule magnet
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2024.138393

•Two dysprosium complexes Dy4 and Dy5 based on hydrazone Schiff-base ligand were synthesized, and their structures could be regulated by controlling temperature.•Complex Dy4 is a typical field-induced single-molecule magnet with an effective energy barrier Ueff of 42.9 K under 1 kOe dc field. Complex Dy5 is a zero dc field single-molecule magnet with an effective energy barrier Ueff of 4.18 K. Two dysprosium complexes [Dy4(H2L)6]⋅4H2O (Dy4) and [Dy5(H2L)(HL)2(L)(µ3OH)2Cl(H2O)(MeCN)2]⋅4MeOH⋅7H2O (Dy5) (H4L = (N',N'''E,N',N'''E)-N',N'''-(pyridine-2,6-diylbis(methanylylidene))bis(2-hydroxybenzohydrazide)) based on hydrazone Schiff-base ligand were synthesized, which could be regulated by controlling temperature (Dy4, below 293 K and Dy5, over 308 K). Magnetic studies show that complex Dy4 is a typical field-induced single-molecule magnet with an effective energy barrier (Ueff) of 42.9 K under 1 kOe dc field. Complex Dy5 is a zero dc field single-molecule magnet with an effective energy barrier (Ueff) of 4.18 K. The results indicate the synthesis of lanthanide complexes is sensitive to substitute of ligand and temperature. Two novel compounds, Dy4 and Dy5, were synthesized by using hydrazone Schiff-base ligand and dysprosium ions. Their structures and single-molecule magnet properties can be regulated by synthetic temperature. [Display omitted]