We report the first in situ NMR observation of 2H2adsorbed inside [Cu3(btc)2] (HKUST-1; btc: benzenetricarboxylate) at ambient temperature and pressure. Hydrogen adsorption behavior was investigated by hydrogen sorption analysis and in situ solid-state 2HNMR under controlled 2H2gas pressure. Although HKUST-1 adsorbed very little amount of H2at 303 K, we could successfully observe the 2H2signal inside HKUST-1 in the NMR spectra. Furthermore, the NMR signal demonstrated that HKUST-1 interacts with H2molecules even at ambient temperature and hydrogen pressure.
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