Compounds of Germanium, Tin and Lead Including Biological Activity and Commercial Application

All-Inorganic Germanium Nanocrystal Films by Cationic Ligand Exchange

“…The OAm amino proton resonance emerges from the baseline and shifts upfield due to concentration but is still broader than the free OAm amino peak, which indicates that ligands freely exchange with the Ge NC surface at room temperature on the NMR time scale. This result appears to rule out covalent attachment of OAm groups by a Ge–NHR interaction, where no surface exchange with free RNH 2 would be expected since such transamination reactions with Ge amides require acidic conditions at room temperature. , …”

“…This result appears to rule out covalent attachment of OAm groups by a Ge−NHR interaction, where no surface exchange with free RNH 2 would be expected since such transamination reactions with Ge amides require acidic conditions at room temperature. 37,38 An additional experiment was used to confirm this amine exchange chemistry at the Ge NC surface. Figure 2a shows the 1 H NMR spectra of the vinylic proton resonance (H v ) region of OAm, where n-hexadecylamine is used to dilute the same functionalized Ge NC sample in toluene-d 8 .…”