Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(Upper) Structure of activated PCN-81. (Lower) CD4 adsorption in PCN-81 as determined by powder neutron diffraction. (Left) At low loading three sites in the Cu12(cdc)12 portion of the structure are populated. (Right) Up to 4.0 CD4/Cu, methane exclusively resides in the octahedral cage. With 12 Cu2+ ions per cage, this results in a cage capacity of 49 methane molecules.
