Designed single-source precursors for iron germanide nanoparticles: colloidal synthesis and magnetic properties. Issue 42 (11th October 2018)

• Record Type: Journal Article
• Authors: Sodreau, Alexandre; Mallet-Ladeira, Sonia; Lachaize, Sebastien; Miqueu, Karinne; Sotiropoulos, Jean-Marc; Madec, David; Nayral, Céline; Delpech, Fabien
• Is Part Of: Dalton transactions. Volume 47:Issue 42(2018)
• Page Start: 15114
• Page End: 15120
• Publication Date: 2018-10-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt02942c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The substituent of single source precursors [{iPrNC( t Bu)NiPr}RGe]Fe(CO)4 (R = Cl, N(SiMe3 )2 ) has a dramatic influence on the synthesis of iron germanide nanoparticles. Abstract : The synthesis of iron germanide nanoparticles at the nanoscale is a challenging task. Here, we describe the preparation of nanocrystals of the hexagonal Fe1.67 Ge phase via the thermolysis of single source precursors [{iPrNC( t Bu)NiPr}RGe]Fe(CO)4 (where R = Cl, N(SiMe3 )2 ) under mild conditions (200 °C). These bimetallic precursors and the corresponding germylenes [{iPrNC( t Bu)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( t Bu)NiPr}{N(SiMe3 )2 }Ge]Fe(CO)4 yielded pure ferromagnetic Fe1.67 Ge 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.