Immobilisation of single molecule magnets in mesoporous silica hosts

被引:37
作者
Willemin, S
Arrachart, G
Lecren, L
Larionova, J
Coradin, T
Clérac, R
Mallah, T
Guérin, C
Sanchez, M
机构
[1] Univ Montpellier 2, CNRS, UMR 5637, Lab Chim Mol & Org Solide, F-34095 Montpellier 5, France
[2] CNRS, Ctr Rech Paul Pascal, UPR 8641, F-33600 Pessac, France
[3] UPMC, CNRS, UMR 7574, Lab Chim Mat Condensee, F-75252 Paris, France
[4] Univ Paris 11, CNRS, UMR 8613, Chim Inorgan Lab, F-91405 Orsay, France
关键词
D O I
10.1039/b305124b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Molecular clusters [Mn12O12(RCOO)(16)(H2O)(n)] (R = CH3, C6H5 (n = 4) and C2H5 (n = 3)) and [Mn-4(CH3COO)(2)(pdmH)(6)] (pdmH = 2,6-bis (hydroxymethyl)pyridine) presenting Single Molecule Magnetic (SMM) behaviour were inserted into hexagonal mesoporous silica with pore size in the 25-100 Angstrom range. An optimum host pore size exists which maximizes the amount of embedded cluster. The composites were studied by X-ray diffraction, infrared spectroscopy, magnetic measurements, nitrogen sorption, thermogravimetric analysis and transmission electronic microscopy. All these methods reveal the presence of intact guest clusters inside the silica pores. Moreover, if the magnetic properties of the clusters appear globally unmodified by the insertion process, the absence of a magnetic isomer form of [Mn12O12(CH3COO)(16)(H2O)(4)] within silica porosity suggests an influence of the confinement on the cluster structure.
引用
收藏
页码:1533 / 1539
页数:7
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