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(A) Absorbance (400 nm in water) during the reduction of 4-NP (0.3 mM) in the presence of NaBH4 (15 mM) and α-CD-capped AuNPs (6.7 μg/mL): reaction not quenched (black) and quenched by phase transfer of AuNPs from the addition of toluene containing azo-ligands at 5 min (red), 10 min (blue), and 20 min (pink). (B) Multicycle reduction of 4-NP (absorbance at 400 nm) catalyzed by AuNPs recovered and recycled through photoreversible phase transfer.
