Abstract
Two high-nuclearity manganese clusters formulated as [MnIIMnIII4(L)2(Py)8(N3)2]·2Py ({Mn5} cluster) and [MnIII10(L)5(DMF)6(H2O)4]·5DMF·9H2O ({Mn10} cluster), (H6L = N,N'-bis(2-salicylhydrazide)isophthalohydrazide, N3– = azide ion, Py = pyridine, and DMF = N,N'-dimethylformamide), were synthesized and structurally characterized. The four MnIII ions and one MnII ion in {Mn5} cluster are linked by two diacylhydrazine ligands to form hemicyclic “Phoenix crown” cluster structure. The {Mn10} cluster presents a deca-nuclear skeleton, which appears to be structurally equivalent to two “Phoenix crown” {Mn5} clusters bridged by a diacylhydrazine ligand. Interestingly, the double helix structure {Mn10} clusters can be also obtained via a simply dissolving and reassembling process of the “Phoenix crown” {Mn5} clusters in the mixed solution of DMF and CH3OH. The magnetic measurements show that {Mn5} and {Mn10} clusters reveal antiferromagnetic interactions.
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