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.
Highlights
In the field of polynuclear coordination chemistry, skillful design strategies involving polytopic ligands often lead to predictable cluster structures, in which bridged transition metal ions exhibit appreciable magnetic spin–spin exchange [1,2,3,4,5,6,7]
We report the synthesis, characterization, and magnetic properties twobased cubanecomplexes with stoichiometries [Ni4 (L )4 (EtOH)4 ] (1) and [Ni4 (L )4 (MeOH)4 ] (2), of both on type complexes with stoichiometries
The Schiff-bases H2 L1 and H2 L2 were readily prepared by the condensation reaction of 2−aminobenzylalcohol with 3-ethoxysalicylaldehyde and 5-fluorosalicylaldehyde, respectively, in methanol
Summary
In the field of polynuclear coordination chemistry, skillful design strategies involving polytopic ligands often lead to predictable cluster structures, in which bridged transition metal ions exhibit appreciable magnetic spin–spin exchange [1,2,3,4,5,6,7]. Such polynucleating ligands comprise coordination pockets, by which the spin centers are bound in adjacent pairs favoring intramolecular spin communication. Thereby, one can note that even slight structural rearrangements of the cubane core, e.g., caused by exchange of coordinated solvent or loss
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