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Phase transfer of AuNPs from water to toluene phase by trans-azo-ligands (vial 1). Vial 2 has no azo-ligands in the toluene phase, and vial 3 has no AuNPs in the water phase. The absorption spectra show absorbance of (A) water phase and (B) toluene phase in vial 1 (black), vial 2 (blue) and vial 3 (red). (C) Absorption spectrum of AuNPs in the toluene phase is achieved by subtraction of the red line from the black line in panel B.
