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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author You Zhonglu, Luo Yingying, Herringer Susan, Li Yanmin, Decurtins Silvio, Krämer Karl W., Liu Shi-Xia,
Project New materials for honeycomb-lattice and single-ion magnets
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Original article (peer-reviewed)

Journal Crystals
Volume (Issue) 10(7)
Page(s) 592 - 592
Title of proceedings Crystals
DOI 10.3390/cryst10070592

Open Access

URL http://doi.org/10.3390/cryst10070592
Type of Open Access Publisher (Gold Open Access)

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 NiII 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.
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