科研之友
微信
新浪微博
Facebook
分享链接
摘要
Four tetranuclear lanthanide compounds with formulas [Ln(4)(HL)(2)(H3L)(2)(H2L')(2)(PhCOO)(2)]center dot 6CH(3)OH (Ln = Nd (1), Sm (2) and Gd (3)) and [Dy-4(DFMP)(2)(H2L)(2)(HL)(2)]center dot 6CH(3)OH center dot 2H(2)O (4) (H4L = 3-((1,3-dihydroxy-2-(hydroxymethyl)propan-2-ylimino)methyl)-2-hydroxy-5-methylbenzaldehyde and H3L' = 3-(4,4-bis(hydroxymethyl)oxazolidin-2-yl)-2-hydroxy-5-methylbenzaldehyde) have been successfully synthesized by a one-pot route at room temperature. The in situ polydentate ligands reveal various coordination modes in forming compounds 1-4. Structure analysis reveal that all four compounds have a centrosymmetric "parallelogram" core, where four mu(3)-CH2O-arms are linked on both sides of the Ln(4) plane in compounds 1-3, while two mu(3)-CH2O- arms connected Dy-4 in compound 4. In addition, magnetic susceptibility studies reveal that compound 4 shows single-molecule magnet (SMM) behaviour with a high-temperature energy barrier of 50.2 K and a low-temperature energy barrier of 4.5 K. The relaxation behaviour is probably attributed to the individual Dy ions and the magnetic coupling between neighboring Dy ions.
