Unraveling the Optoelectronic and Photochemical Behavior of Zn4O-Based Metal Organic Frameworks

Zn4O clusters corresponding with those present in MOF-5, IRMOF-8, and IRMOF-9 have been synthesized as monounits with the respective monodentate organic linkers attached. Ultraviolet (UV) absorption analysis of synthesized clusters and metal organic frameworks (MOFs) reveals that the organic moieties in the MOFs lose their individual absorption and emission characteristics, in contrast with their subunits which retain these characteristics. Observed photoluminescence (PL) quantum yields of the MOFs are higher than those of their corresponding subunits. This is explained by the isolation of clusters in monounits, where linkers are only attached to one cluster, resulting in greater charge localization compared to MOFs. The photocatalytic activity of the clusters in the nonporous monounits crystals turned out to be higher than that of their MOF counterparts and that of zinc oxide in the oxidation of propene at room temperature under UV illumination. Clearly porosity does not offer in this case any significan...

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