Direct water-based synthesis and characterization of new Zr/Hf-MOFs with dodecanuclear clusters as IBUs

Abstract

Two new metal–organic framework compounds of composition [M₁₂(μ₃-O)₈(μ₃-OH)₈(μ-OH)₆(OH)₆(H₂O)₆(APDC)₆], with M = Zr and Hf, denoted as M-CAU-39, containing the azopyridinedicarboxylate ion (APDC²⁻) as a new linker, were obtained by a water-based synthesis. The crystal structure was determined from powder X-ray diffraction data. The inorganic building unit (IBU) is the dodecanuclear cluster {M₁₂O₈(OH)₁₄} and its connection results in a porous two-dimensional network.