“…This is further motivated by prior studies of transition metal-oxo complexes,w hich have shown that the presence and identity of coordinating,a nionic ligands can greatly enhance rates of hydrogen atom transfer reactions. [5,31,32] Of the previously synthesized MAFs containing open metal sites,M -BTT, [33] M-BTTri (H 3 BTTri = 1,3,5tri(1H-1,2,3-triazol-5-yl)benzene), [34,35] and M-BDTriP (H 3 BDTriP = 5,5'-(5-(1H-pyrazol-4-yl)-1,3-phenylene)bis-(1H-1,2,3-triazole)) [34] all have m 4 -Cl À ligands,M 2 Cl 2 (BBTA) (H 2 BBTA = 1H,5H-benzo(1,2-d:4,5-d')bistriazole) [36] and M 2 Cl 2 (BTDD) (H 2 BTDD = bis(1H-1,2,3-triazolo [4,5-b],-[4',5'-i])dibenzo [1,4]dioxin)) [37] have m-Cl À ligands,a nd M-MFU-4l (MFU = Metal-Organic Framework Ulm) has terminal Cl À ligands [38,39] that can potentially be exchanged. Postsynthetic ligand exchange in the aforementioned materials has led to the discovery of MOFs with enhanced water uptake, [40] O 2 binding strengths, [41] hydrogen storage properties, [42] and turnover frequencies for CO 2 reduction, [43] among several other applications.…”