WFNA and RFNA are highly corrosive oxidizing agents and should be treated with care. In performing drop tests, the MOFs or corresponding solid ligands were exposed to one drop (10 μl volume) of WFNA or RFNA via a 100-μl Hamilton syringe (Hamilton, Reno, NV, USA). The liquid was dropped from a fixed height (5 cm) into a 4.5-cm vial containing approximately 5 mg of the particular material being tested. A Redlake MotionPro Y4 (Tallahassee, FL, USA) high-speed charge-coupled device camera was used to capture the event at 1000 frames/s. ID was considered to be the time between the contact of the oxidizing liquid with the solid material and the subsequent ignition and was measured by counting the frames between the two events. The test was repeated three times, the values for ID were averaged, and a standard deviation was calculated. For testing of the hypergolic behavior of MOFs containing included guests, ca. 50 mg of Zn(AIm)2 or Co(AIm)2 was stirred overnight in 1 ml of either nitromethane or DMF, filtered, and dried briefly in air.

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