Some Symmetrical Tetraalkyl- and Tetraaralkyl-germanes

Fuchs, Richard; Moore, Leonard O.; Miles, David L.; Gilman, Henry

doi:10.1021/jo01116a015

Cited by 11 publications

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“…58 Further evidence of alkyl moiety covalent surface attachment is provided by a Ge−C stretching absorption at 700 cm −1 . 59 Features at about 860 cm −1 are attributed to Ge−O stretching modes arising from oxidation that presumably occurs during workup following functionalization.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…In all cases, we note the intensity of the Ge–H diminishes dramatically and intense absorptions at about 2850–2650 and 1460 cm –1 appear; we confidently attribute these new features to C–H stretching and bending modes of surface-bonded aliphatic chain . Further evidence of alkyl moiety covalent surface attachment is provided by a Ge–C stretching absorption at 700 cm –1 . Features at about 860 cm –1 are attributed to Ge–O stretching modes arising from oxidation that presumably occurs during workup following functionalization.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂

et al. 2017

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The synthesis of germanium nanocrystals (GeNCs) with well-defined surface chemistry is of considerable interest because of their potential applications in the optoelectronic, battery, and semiconductor industries. Modifying and tailoring GeNC surface chemistry provides an avenue by which reactivity, environmental compatibility (e.g., solubility, resistance to oxidation), and electronic properties may be tailored. Hydride-terminated GeNCs (H-GeNCs) are of particular interest because the reactivity of surface Ge-H bonds toward alkenes and alkynes via hydrogermylation affords the potential for convenient modification; however, these reactions and their scope have not been widely explored. This report describes a straightforward route for preparing a GeNC/GeO composite via disproportionation of heretofore-unexplored Ge(II) oxide-based precursor from which the H-GeNCs were freed by subsequently chemical etching. The H-GeNCs were derivatized using a series of hydrogermylation approaches (i.e., thermally activated, radical-initiated, and borane-catalyzed). The presented findings indicate surface functionalization occurs under all conditions investigated; however the nature of surface species (i.e., monolayers vs multilayers) and surface coverage varies depending upon the conditions employed.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂

et al. 2017

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“…At the least, the alkyl termination prevents oxidation of the particles and provides a stable passivation layer. The spectra of the dried colloids were compared to both published spectra for the Ge tetraalkyls , and GeO 2 …”

Section: Resultsmentioning

confidence: 99%

Solution Synthesis and Characterization of Quantum Confined Ge Nanoparticles

Taylor¹,

Kauzlarich²,

Delgado³

et al. 1999

Chem. Mater.

128

102

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A solution synthesis of crystalline Ge nanoparticles (nc-Ge ) is reported. The metathesis reaction of NaGe with excess GeCl 4 in glyme solvents produces nc-Ge. Metathesis reactions between KGe and excess GeCl 4 or GeCl 2 :(dioxane) in glyme and Mg 2 Ge and excess GeCl 4 in diglyme and triglyme were also investigated. The surface of these nanoparticles is terminated with alkyl groups by reaction with alkyl Li and Grignard reagents. The alkyl-terminated crystalline Ge nanoparticles (R ˆ-nc-Ge) were characterized by Fourier transform infrared spectroscopy, high-resolution transmission electron microscopy, powder X-ray diffraction, UV-vis absorption spectroscopy, photoluminescence, and photoluminescence excitation spectroscopy. The optical properties of R ˆ-nc-Ge made by this method agree with predictions from quantum confinement models.

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“…The peaks in the fingerprint region show similarity, but not complete agreement with published spectra for Ge tetraalkyls. 25,26 HRTEM of the samples produced by the above procedures revealed crystalline Ge nanoclusters in all of the samples characterized. In the best samples, the majority of nanoclusters seen in the HRTEM micrographs are between 2 and 5 nm (Figure 2), with an average size of 3.5(1.2) nm.…”

mentioning

confidence: 93%

Solution Synthesis of Germanium Nanocrystals Demonstrating Quantum Confinement

et al. 1998

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Some Symmetrical Tetraalkyl- and Tetraaralkyl-germanes

Cited by 11 publications

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Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂

Solution Synthesis and Characterization of Quantum Confined Ge Nanoparticles

Solution Synthesis of Germanium Nanocrystals Demonstrating Quantum Confinement

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Some Symmetrical Tetraalkyl- and Tetraaralkyl-germanes

Cited by 11 publications

References 0 publications

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)2

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)2

Solution Synthesis and Characterization of Quantum Confined Ge Nanoparticles

Solution Synthesis of Germanium Nanocrystals Demonstrating Quantum Confinement

Contact Info

Product

Resources

About

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂

Synthesis and Surface Functionalization of Hydride-Terminated Ge Nanocrystals Obtained from the Thermal Treatment of Ge(OH)₂