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The hydrothermal reaction of V2O5, Cu(CH3COO)2.H2O, 1,2-diaminopropane and [N(CH3)4]OH yields the novel three-dimensional open-framework solid [(Cu(1,2-pn)2)7-(V16O38(H2O))2].4H2O constructed from the new mixed-valence [V16O38(H2O)]7- clusters interconnected through mu 2-[Cu(1,2-pn)2]2+ groups.

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A new pentadentate N-isobutyrylsalicylhydrazidate ligand (H(3)ibushz, C(11)H(14)N(2)O(3)) and a self-assembly synthesis of the first 24-azametallacrown-8, [Fe(8)(C(11)H(11)N(2)O(3))(8)(CH(3)OH)(8)].0.5CH(2)Cl(2).7.5CH(3)OH.3.5H(2)O, have been reported. Eight Fe(III) ions and eight deprotonated ibushz(3)(-) ligands construct a planar 24-membered ring based on the M-N-N-M linkage. The chiralities of the iron atoms on the 24-azametallacrown-8 ring alternate between the Lambda and Delta forms. The title octanuclear azametallacrown has no crystallographic centrosymmetry, while all the known metallacrowns and azametallacrowns with an even nuclear number have crystallographic centrosymmetry. The study of (1)H NMR spectra suggests that the title compound retains its metallacrown structure in solution at room temperature over a period of at least three months. There exists a strong antiferromagnetic exchange interaction between the iron paramagnetic centers.