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Issue 4, 2003
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Structural and magnetic studies of the [Mn12O12(CH3COO)16(H2O)4]·2CH3COOH·4H2O thermal derivatives

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Abstract

Thermal transformations of the well-known high spin manganese carboxylate cluster [Mn12O12(CH3COO)16(H2O)4]·4H2O·2CH3COOH have been studied in detail. Three steps in its thermal transformation have been observed with the successive formation of well-defined compounds. Upon heating at 403 K, acetic acid and water molecules located in inter-cluster void spaces are removed without significant modification of the structural packing and magnetic properties. Interestingly, the resulting material presents the remarkable property of being able to incorporate ammonia into its structure. Dramatic changes in the magnetic properties of this insertion compound have been observed and confirmed the first synthesis of a single-molecule magnet material by gas inclusion. Further heating at 513 K stabilizes the hausmannite Mn3O4 phase as indicated by X-ray diffraction, thermogravimetric analyses and magnetic measurements. Finally, heating of the compound above 573 K leads to a mixture of different manganese compounds, Mn3O4 and MnCO3, previously observed in the decomposition of Mn(CH3COO)2·4H2O.

Graphical abstract: Structural and magnetic studies of the [Mn12O12(CH3COO)16(H2O)4]·2CH3COOH·4H2O thermal derivatives

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Article information


Submitted
04 Oct 2002
Accepted
20 Jan 2003
First published
13 Feb 2003

J. Mater. Chem., 2003,13, 795-799
Article type
Paper

Structural and magnetic studies of the [Mn12O12(CH3COO)16(H2O)4]·2CH3COOH·4H2O thermal derivatives

J. Larionova, R. Clérac, B. Boury, J. Le Bideau, L. Lecren and S. Willemin, J. Mater. Chem., 2003, 13, 795
DOI: 10.1039/B209752B

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