Coordinatively unsaturated metal organic frameworks (MOFs) were studied for boron trifluoride (BF3) sorption. MOF-74-Mg, MOF-74-Mn, and MOF-74-Cu show high initial uptake (below 6.7 X 10(-3) bar) with negligible deliverable capacity. The BF3 isotherm of MOF-74-Cu exhibits gradual uptake up to 0.9 bar and has a deliverable gravimetric capacity that is more than 100% higher than activated carbon. Two other Cu2+ MOFs, MOF-SOS and HKUST-1, have slightly lower deliverable capacities compared to MOF-74-Cu.