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Reactions of copper(II) sulfate or copper(II) perchlorate, samarium(III), erbium(III) or neodymium(III) nitrate (5/1equiv.) with pyrazinohydroxamic acid (H2Pyzha) in H2O/MeOH led to three new heterobimetallic 15-metallacrown-5 complexes. In a MeOH/H2O solution, when adding inorganic salts, the ligands exist as protonated metallacrowns. In the solid state, their structures are more complicated as confirmed...
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