Selective adsorption of dihydrogen isotopes on DUT-8 (Ni,Co) monitored by in situ electron paramagnetic resonance.

In situ continuous wave electron paramagnetic resonance investigation has been proven as a powerful method by employing paramagnetic Ni 2+ -Co 2+ pairs as spin probes to follow the isotope-selective gate opening phenomenon on the DUT-8(Ni 0.98 Co 0.02 ) framework. This method is very sensitive to detect the phase transition from the closed pore to the open pore phase in response to D 2 adsorption in the framework, while no phase transformation has been observed during H 2 gas adsorption. More interestingly, it is also able to sense local structural changes around the spin probe during the desorption of D 2 gas. Based on these evidences, the in situ continuous wave electron paramagnetic resonance method can be implemented as an efficient and non-invasive technique for the detection of dihydrogen isotopes.