Structural and magnetic characterization of tetranuclear [Ni(II)<inf>2</inf>Ln(III)<inf>2</inf>] complexes bearing tetra-branched Schiff base ligands

Shen, Lingyi; Hu, Peng; Yang, Xian Jiong; Xu, Hong; Huang, Ya Li; Redshaw, Carl; Zhang, Qi Long

Abstract

A series of tetranuclear [Ni(II)2Ln(III)2] complexes of general formula [Ni2Ln2(L)(H2O)9(OH)4Cl]∙3H2O∙Cl (1, 2, 5) (Ln = Dy (1), Tb (2), Ho (5)) and [Ni2Ln2(L)(H2O)12Cl] ∙3H2O∙5Cl (3, 4, 6, 7) (Ln = Gd (3), Sm (4), Nd (6), Pr (7)); H4L = N,N’,N’’,N’’’-tetra(3-methoxysalicylidene)-pentaerythritol) have been synthesized. The molecular structures and magnetic properties of 1–7 are reported. Structural analysis indicated that this family of clusters consists of a tetranuclear [Ni(II)2Ln(III)2] core, supported by a tetrapodal Schiff base ligand. Both Ni(II) ions adopt a distorted octahedral coordination environment, whilst the two terminal Ln(III) ions exhibit distorted tricapped trigonal prismatic geometries and are coordinated by eight or nine oxygen donor atoms. Magnetic measurements revealed that the Dy derivative of complex 1 displays typical d single-molecule magnet behaviour with the presence of slow magnetic relaxation. By contrast, complexes 2–7, no obvious SMM behaviour was exhibited, however for the Gd derivative 3, a significant magnetocaloric effect was observed.

Citation

Shen, L., Hu, P., Yang, X. J., Xu, H., Huang, Y. L., Redshaw, C., & Zhang, Q. L. (2022). Structural and magnetic characterization of tetranuclear [Ni(II)2Ln(III)2] complexes bearing tetra-branched Schiff base ligands. Polyhedron, 212, Article 115584. https://doi.org/10.1016/j.poly.2021.115584

• Journal Article Type: Article
• Acceptance Date: Nov 15, 2021
• Online Publication Date: Nov 22, 2021
• Publication Date: Jan 15, 2022
• Deposit Date: Nov 22, 2021
• Publicly Available Date: Nov 23, 2022
• Journal: Polyhedron
• Print ISSN: 0277-5387
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 212
• Article Number: 115584
• DOI: https://doi.org/10.1016/j.poly.2021.115584
• Keywords: Structural analysis; Schiff base; Magnetic measurements; Single-molecule magnet; Magnetocaloric effect
• Public URL: https://hull-repository.worktribe.com/output/3885471