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A cascade approach to hetero-pentanuclear manganese-oxide clusters in polyoxometalates and their single-molecule magnet properties.

Dalton transactions (Cambridge, England : 2003) (2015-05-23)
Kosuke Suzuki, Rinta Sato, Takuo Minato, Masahiro Shinoe, Kazuya Yamaguchi, Noritaka Mizuno
ABSTRACT

Structurally well-defined hetero-pentanuclear manganese-oxide clusters {MMn4} were successfully synthesized in TBA7Hn[MMn4(OH)2(A-α-SiW9O34)2]·2H2O·C2H4Cl2 (, M = Fe(iii), Co(ii), Ni(ii), Cu(ii), Ga(iii)) by sequential introduction of metal cations into the trivacant lacunary polyoxometalates (POMs). The pentanuclear manganese-oxide cluster {Mn5} showed a small spin ground state and a low energy barrier for magnetization relaxation. In contrast, the magnetic interactions in the hetero-pentanuclear clusters could be controlled by the arrangements of metals, and the clusters showed large magnetic anisotropy and single-molecule magnet behavior. In particular, the cluster {FeMn4} in (S = 11/2) showed the slowest relaxation and the highest energy barrier among the previously reported transition metal-containing POMs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Copper(II) acetate, 98%
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Iron(III) acetylacetonate, 97%
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Nickel(II) acetylacetonate, 95%
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Cobalt(II) acetylacetonate, 97%
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Iron(III) acetylacetonate, ≥99.9% trace metals basis
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Cobalt(II) acetylacetonate, ≥99.0% (KT)
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Copper(II) acetate, powder, 99.99% trace metals basis

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