The solubilization of HAuCl4 in toluene withinoptically active reverse micelles and lamellar structures formedby (1R,2S)-Dodecyl(2-hydroxy-1-methyl-2-phenylethyl)-dimethylammonium bromide (DMEB) has allowed us toevidence the complex phenomenology accompanying theconfinement of Au salt within these nanostructures. Togetherwith a chloride/bromide exchange process occurring in thefirst coordination sphere of an Au ion, UV−vis and electroniccircular dichroism (ECD) spectra reveal the appearance of aninduced dichroic signal attributable to Au complexesentrapped in the hydrophilic domain of the DMEB chiralnanostructures. Interestingly, change of the effective oxidationstate and coordination geometry of the gold ion confined in DMEB nanostructures has been inferred by an analysis of the Au andBr X-ray Absorption Fine Spectroscopy (X-ray Absorbition Near Edge Spectroscopy and Extended X-ray Absorption FineSpectroscopy) signals. Remarkably, bromine, not covalently bonded to the organic part, acts as the vector that transfers thechirality information on the DMEB to the gold complexes. Structural information on the HAuCl4 solubilized in DMEB reversemicelles dispersed in toluene, obtained by SAXS, indicate the formation of elongated clusters consisting of Au complexesstabilized by DMEB, confirming that the chirality transfer occurs in the micellar core of the DMEB and persists in the solidcomposites obtained by slow evaporation of the solvent.
|Numero di pagine||10|
|Rivista||JOURNAL OF MATERIALS CHEMISTRY. C|
|Stato di pubblicazione||Published - 2015|
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