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 Ni2+-Co2+ 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.

Automated summary

By using paramagnetic Ni2+-Co2+ pairs as spin probes, in situ continuous wave electron paramagnetic resonance investigation has been proven as a powerful method to follow the isotope-selective gate opening phenomenon on the DUT-8(Ni-0.98 Co-0.02) framework. This method is sensitive to the phase transition from closed pore to open pore phase in response to D-2 adsorption, while no phase transformation has been observed during H-2 gas adsorption. Additionally, it can sense local structural changes around the spin probe during D-2 gas desorption. 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.