Three-Dimensional Porous Cd(II) Coordination Polymer with Large One-Dimensional Hexagonal Channels: High Pressure CH₄ and H₂ Adsorption Studies

A new porous and hydrothermally stable three-dimensional (3D) coordination polymer {[Cd(bpydb)]·6H2O}n (1) has been synthesized under solvothermal condition from a new rigid ligand 4,4′-(4,4′-bipyridine-2,6-diyl) dibenzoic acid (H2bpydb) and Cd(NO3)2·6H2O. Single crystal X-ray analysis shows that 1 has a 5-connected 4466 vma net with one-dimensional (1D) hexagonal channels filled with water molecules. Integrity of the framework is maintained upon removal of the water molecules by heating to result in a porous framework. Low pressure N2 and high pressure H2 and CH4 sorption studies along with water adsorption studies were performed on this framework.