(Phys.org)—Researchers from the University of Sheffield report a new continuous-breathing metal-organic framework (MOF), SHF-61, that has two different solvent-specific forms, a narrow-pore structure that is the result of DMF or H2O desolvation and a wide-pore structure that is the result of CHCl3 desolvation. The wide-pore form showed uptake of N2, CO2, and CH4 with selectivity for CO2. They were also able to conduct single-crystal structure analysis of their MOF during breathing motions. Their work appears in Nature Chemistry.