Synthesis and structural characterization of new polynuclear complexes of 1-hydroxymethyl-3,5-dimethylpyrazole with Ni(II) and Fe(II)

The complexation of the simple 1-hydroxymethyl-3,5-dimethylpyrazole (HL) ligand with Fe and Ni salts leads to interesting polynuclear complexes in good yield. X-ray diffraction reveals that the resulting complexes (μ4-L)4Ni4Cl4(H2O)4 and (μ2-L)4(μ3-L)2Fe8Cl16(μ4-O)6 adopt cubane-type and open-cubane-type structures in the solid state.

Graphical abstractHerein we have performed the synthesis of new cubane and open-cubane type clusters based on pyrazole and Ni and Fe halides, with good yields. The X-ray crystallographic structures of both complexes have also been studied.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis of new Ni cubane-type and Fe open-cubane-type structures based on pyrazolyl ligand. ► They have specific and geometric forms. ► These results make these compounds worthwhile for further investigation as molecule-based magnets.