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Visible-light absorption brought about by both the anthracene units and the charge-transfer absorption on the late-formed quintuple π–π stacked host–guest complex efficiently facilitates aerobic photooxidation for the sulfide guests by visible-light irradiation under mild conditions. Once substrates bind to its hydrophobic cavity, this capsule would undergo quantitative capsule-to-bowl transformation. The molecular capsule was coordination-assembled from three anthracene-bridged bis-TPT ligands and six (bpy)Pd(NO 3) 2 (bpy = 2,2′-bipyridine).

Herein, we report a biomimetic water-soluble molecular capsule featuring adaptive structural change toward substrate binding, which offers an ideal platform for efficient photocatalysis. One important feature of enzyme catalysis is the induced-fit conformational change after binding substrates.