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, Powder X-ray diffraction measurements. Powder XRD (PXRD) patterns of 17

, Reflections were collected at 2q values between 5 and 120° with a step size of 0.02°. To thoroughly characterize the MOF, additional a-Mg 3 (HCOO) 6 samples were prepared under identical synthetic conditions using ordinary water rather than 17 O-enriched H 2 O. The PXRD patterns of these samples, Mg 3 (HCOO) 6 (Figure S1) were acquired using an Inel CPS powder diffractometer operating with Cu Ka radiation (l = 1.5406 Å)

, Unit cell parameters of the as-made and activated samples were refined by the Le Bail method (Figure S2) using the GSAS-II software package. 1 The powder patterns acquired on the Rigaku diffractometer were used for the refinement, as the signal-to-noise ratio (S/N) was significantly better. The unit cell parameters obtained via the Le Bail method are, Samples were scanned at 5° ? 2q ? 50° at a scan rate of 10 °/min with a step size of 0.02°

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