(Top) Scheme showing the photoreduction of MIL-125 and subsequent oxidation. For simplicity, only one Ti8 cluster is shown (the structure of MIL-125 is depicted within the blue circles). For maximum photoreduction, n ≅ 2. (Bottom) 1H NMR spectrum of the subsequent reaction with tBu3ArO• (C6D6). The colored dots identify tBu3ArOH (blue), Ar2O (internal standard, red), and C6D5H, THF, and iPrOH (green).