Electrochemical generation and observation by magnetic resonance of superparamagnetic cobalt nanoparticles

Khusnuriyalova, Aliya F.; Petr, Andreas; Gubaidullin, А. Т.; Сухов, А. В.; Морозов, В. И.; Büchner, B.; Kataev, V.; Sinyashin, Оleg G.; Yakhvarov, Dmitry G.

doi:10.1016/j.electacta.2017.12.050

Cited by 14 publications

(7 citation statements)

References 24 publications

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“…It involves a disproportionation process which was also recently proposed in an electrochemical study. 54 In this article, Yakhvarov et al demonstrated that nickel but also iron NPs can be synthesized using the disproportionation mechanism. To study the versatility of our synthesis, the analogous ClNi(PPh 3 ) 3 complex was tested for which a favored disproportionation process is proposed computationally (see Table 2).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…We demonstrated a new pathway to reach size- and shape-controlled hcp cobalt nanospheres starting from XCo(PR 3 ) 3 . It involves a disproportionation process which was also recently proposed in an electrochemical study . In this article, Yakhvarov et al demonstrated that nickel but also iron NPs can be synthesized using the disproportionation mechanism.…”

Section: Resultsmentioning

confidence: 99%

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Role of Oleylamine Revisited: An Original Disproportionation Route to Monodispersed Cobalt and Nickel Nanocrystals

et al. 2019

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Herein is highlighted an original disproportionation mechanism for the formation of hexagonal closed packed cobalt nanoparticles starting from low-valent cobalt complexes. By coupling experimental and theoretical studies, we demonstrate that oleylamine promotes the disproportionation of the starting metal complexes and controls the growth of the nanocrystals, in contrast to the role of reducing reagents proposed elsewhere. We also decipher the sensitivity of the synthesis in regard to the nature of the phosphine and of the halogen ligands in the starting cobalt precursors. Understanding of the mechanism allows the development of a less expensive and less toxic synthesis of these nanoparticles by decreasing the amount of oleylamine in alkane solvents. Finally, an extension of this process is presented and allows reaching size-and shape-controlled nanosphere and nanorod nickel nanoparticles.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Role of Oleylamine Revisited: An Original Disproportionation Route to Monodispersed Cobalt and Nickel Nanocrystals

et al. 2019

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“…In 2018, we have reported the electrochemical generation of superparamagnetic Co NPs [276] . The electrochemical reduction of cobalt dibromide 2,2’‐bipyridine (bpy) complexes (Co/bpy molar ratio 1:0.5–1) results in the formation of Co NPs due to a disproportionation reaction of the electrochemically generated cobalt(I) mononuclear complexes (Scheme 4).…”

Section: Preparation Of Cobalt Nanoparticlesmentioning

confidence: 99%

Preparation of Cobalt Nanoparticles

et al. 2021

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The development of modern chemistry is currently proceeding in several priority areas including investigations focused on the synthesis, stabilisation, and application of transition metal nanoparticles (NPs), which are widely used in physical, chemical, engineering, and biomedical processes. A special place among known transition metal NPs is occupied by cobalt nanoparticles, since they are used for highly important targets, such as creation of new catalysts, magnetic devices, composites, or carriers for drug delivery. The selective preparation of NPs is a difficult task that requires special conditions and has some limitations. In this minireview, we summarise the most successful and most efficient methods for obtaining Co NPs, including chemical and physical aspects of their preparation.

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“…By comparing the CVs of [bpy-Co III ] -(acac) 3 , [bpy-Co II ](acac) 2 , [bpy-Co II ]Br 2 , and bpy, we assigned the Co-complex and ligand reduction peaks. 17 In addition, we measured the CV of Co(acac) 3 , Co(acac) 2 , Na(acac), Zn(acac) 2 , and acetylacetone, and no reduction peak was observed between −1.0 and −2.0 V vs SCE (Figure S4, Supporting Information). We also investigated the CV of [bpy-Co III ](acac) 3 with varying equivalents of aryl bromide, alkyl bromide, and germanium chloride (Figure S1−S3, Supporting Information).…”

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confidence: 99%

“…The reduction potential of aryl bromide, alkyl bromide, and germanium chloride were determined to be −2.62, −2.64, and −2.81 V vs SCE, respectively, which are lower than those of [bpy-Co III ](acac) 3 (−0.60 V for Co III /Co II , −1.60 V for Co II /Co I , and −1.83 V vs SCE for Co I /Co 0 ). By comparing the CVs of [bpy-Co III ](acac) 3 , [bpy-Co II ](acac) 2 , [bpy-Co II ]Br 2 , and bpy, we assigned the Co-complex and ligand reduction peaks . In addition, we measured the CV of Co(acac) 3 , Co(acac) 2 , Na(acac), Zn(acac) 2 , and acetylacetone, and no reduction peak was observed between −1.0 and −2.0 V vs SCE (Figure S4, Supporting Information).…”

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confidence: 99%

Carbon–Germanium Bond Formation via Low-Valent Cobalt-Catalyzed Cross-Electrophile Coupling

et al. 2023

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An efficient, electrochemically induced cobalt-catalyzed carbon−germanium bond formation provides access to a variety of functionalized germane-containing compounds, including aryl, vinyl, and alkyl germanes. The cobalt-catalyzed germylation is conducted under mild reaction conditions and exhibits a broad scope and functional group tolerance. Mechanistic experimental studies provide insight into the unexpected reaction pathway and the sequential activation of the different electrophiles.

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Electrochemical generation and observation by magnetic resonance of superparamagnetic cobalt nanoparticles

Cited by 14 publications

References 24 publications

Role of Oleylamine Revisited: An Original Disproportionation Route to Monodispersed Cobalt and Nickel Nanocrystals

Role of Oleylamine Revisited: An Original Disproportionation Route to Monodispersed Cobalt and Nickel Nanocrystals

Preparation of Cobalt Nanoparticles

Carbon–Germanium Bond Formation via Low-Valent Cobalt-Catalyzed Cross-Electrophile Coupling

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