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

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Abstract

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.

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

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Publication details

The article was received on 19 Jul 2018, accepted on 25 Sep 2018 and first published on 27 Sep 2018


Article type: Paper
DOI: 10.1039/C8DT02942C
Citation: Dalton Trans., 2018, Advance Article
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    Designed single-source precursors for iron germanide nanoparticles: colloidal synthesis and magnetic properties

    A. Sodreau, S. Mallet-Ladeira, S. Lachaize, K. Miqueu, J. Sotiropoulos, D. Madec, C. Nayral and F. Delpech, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT02942C

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