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 (O) 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, [O@AgCuL] (2), that can completely release the inserted peroxide dianion as the singlet oxygen (O) via a H-assisted disproportionation process in methanol. Notably, the resulting empty AgCuL(ClO) (3) is able to trap oxygen (O) from air and fixes it in the macrocycle host as a peroxide dianion; furthermore, it releases it as O again in the presence of H. So, the bimetallic macrocycle [AgCuL] herein behaves as a highly efficient reusable triplet oxygen receptor and singlet oxygen generator.