Copper(II)-Silver(I) Macrocyclic Metal-Organic Framework: A Highly Efficient Reusable Triplet Oxygen Collector and Singlet Oxygen Generator.

The generation of highly reactive oxygen (1 O2 ) is very significant for a variety of applications such as degradation, bleaching, chemical synthesis, photodynamic therapy for tumor treatment, and others. Herein, we report a novel peroxide-dianion-embedded bimetallic macrocycle, [O2 2- @Ag4 Cu4 L4 ]2+ (2), that can completely release the inserted peroxide dianion as the singlet oxygen (1 O2 ) via a H+ -assisted disproportionation process in methanol. Notably, the resulting empty Ag4 Cu4 L4 (ClO4 )4 (3) is able to trap oxygen (3 O2 ) from air and fixes it in the macrocycle host as a peroxide dianion; furthermore, it releases it as1 O2 again in the presence of H+ . So, the bimetallic macrocycle [Ag4 Cu4 L4 ]4+ herein behaves as a highly efficient reusable triplet oxygen receptor and singlet oxygen generator.