Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties

You, Zhonglu; Luo, Yingying; Herringer, Susan; Li, Yanmin; Decurtins, Silvio; Krämer, Karl W.; Liu, Shi-Xia

doi:10.3390/cryst10070592

Open AccessArticle

Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties

by

Zhonglu You

¹,

Yingying Luo

¹,

Susan Herringer

²,

Yanmin Li

¹,

Silvio Decurtins

²,

Karl W. Krämer

²

and

Shi-Xia Liu

^2,*

¹

Department of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China

²

Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland

^*

Author to whom correspondence should be addressed.

Crystals 2020, 10(7), 592; https://doi.org/10.3390/cryst10070592

Submission received: 19 June 2020 / Revised: 3 July 2020 / Accepted: 6 July 2020 / Published: 9 July 2020

(This article belongs to the Section Inorganic Crystalline Materials)

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Abstract

The cubane-type structure is a typical representative of tetranuclear coordination compounds. In this work, two anionic Schiff-base ligands, (L¹)²⁻ and (L²)²⁻, each offering an O^N^O coordination pocket, ligate four Ni^II ions into a [Ni₄O₄] cubane core. The ligands are H₂L¹ = 2−[[(3-ethoxy-2−hydroxyphenyl) methylene]amino]benzenemethanol and H₂L² = 2−[[(5-fluoro-2−hydroxyphenyl)methylene]amino]benzenemethanol. In both compounds, [Ni₄(L¹)₄(EtOH)₄] (1) and [Ni₄(L²)₄(MeOH)₄] (2), alkoxy oxygens of the ligands act in a bridging μ₃-O binding mode. Magnetic susceptibility and magnetization data for compounds 1 and 2 are presented. The Ni–O–Ni bond angles of the cubane core determined from single crystal X-ray diffraction data play a key role for a magneto-structural correlation. Dominant intracube ferromagnetic behavior is observed, and the coupling parameters were determined for both compounds, leading to nonzero spin ground states in accordance with the broadly accepted bond angle guideline.

Keywords: Cubane-type structure; magnetic properties; nickel cluster; Schiff-base; structure elucidation

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MDPI and ACS Style

You, Z.; Luo, Y.; Herringer, S.; Li, Y.; Decurtins, S.; Krämer, K.W.; Liu, S.-X. Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties. Crystals 2020, 10, 592. https://doi.org/10.3390/cryst10070592

AMA Style

You Z, Luo Y, Herringer S, Li Y, Decurtins S, Krämer KW, Liu S-X. Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties. Crystals. 2020; 10(7):592. https://doi.org/10.3390/cryst10070592

Chicago/Turabian Style

You, Zhonglu, Yingying Luo, Susan Herringer, Yanmin Li, Silvio Decurtins, Karl W. Krämer, and Shi-Xia Liu. 2020. "Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties" Crystals 10, no. 7: 592. https://doi.org/10.3390/cryst10070592

APA Style

You, Z., Luo, Y., Herringer, S., Li, Y., Decurtins, S., Krämer, K. W., & Liu, S.-X. (2020). Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties. Crystals, 10(7), 592. https://doi.org/10.3390/cryst10070592

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Formation of Tetranuclear Nickel(II) Complexes with Schiff-Bases: Crystal Structures and Magnetic Properties

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