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

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

Authors

Lingyi Shen

Peng Hu

Xian-Jiong Yang

Hong Xu

Ya-Li Huang

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Qi-Long Zhang



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., Xu, H., Huang, Y., Redshaw, C., & Zhang, Q. (2021). Structural and magnetic characterization of tetranuclear [Ni(II)2Ln(III)2] complexes bearing tetra-branched Schiff base ligands. Polyhedron, 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 Nov 22, 2021
Deposit Date Nov 22, 2021
Publicly Available Date Nov 23, 2022
Journal Polyhedron
Print ISSN 0277-5387
Publisher Elsevier
Peer Reviewed Peer Reviewed
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