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Article Dans Une Revue Dalton Transactions Année : 2018

Designed single-source precursors for iron germanide nanoparticles: colloidal synthesis and magnetic properties

Résumé

The synthesis of iron germanide nanoparticles at the nanoscale is a challenging task. Here, we describe the preparation of nanocrystals of the hexagonal Fe1.67Ge phase via the thermolysis of single source precursors [{iPrNC(tBu)NiPr}RGe]Fe(CO)4 (where R = Cl, N(SiMe3)2) under mild conditions (200 °C). These bimetallic precursors and the corresponding germylenes [{iPrNC(tBu)NiPr}RGe] were fully characterized by spectroscopic techniques as well as single crystal X-ray diffraction. While the structural features of the molecular species were shown to be almost identical, the results of the thermolysis were highly dependent on the nature of R. When R = Cl, multimodal size distributions and non-controlled phases were obtained. In contrast, the thermolysis of [{iPrNC(tBu)NiPr}{N(SiMe3)2}Ge]Fe(CO)4 yielded pure ferromagnetic Fe1.67Ge nanoparticles with a mean diameter close to 6 nm and a narrow size distribution (<12%). These results were rationalized in terms of Ge–substituent bond energy thanks to a computational study.

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Chimie
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Dates et versions

hal-02361535 , version 1 (13-11-2019)

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Alexandre Sodreau, Sonia Mallet-Ladeira, Sébastien Lachaize, Karinne Miqueu, Jean-Marc Sotiropoulos, et al.. Designed single-source precursors for iron germanide nanoparticles: colloidal synthesis and magnetic properties. Dalton Transactions, 2018, 47 (42), pp.15114-15120. ⟨10.1039/C8DT02942C⟩. ⟨hal-02361535⟩
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