Uncoordinated Carboxyl Groups as Proton Sources in Polyoxometalate-Based Metal–Organic Frameworks Enhance Proton Conduction

To select appropriate organic ligands is an effective strategy to enhance the proton conductivities of polyoxometalate-based metal-organic frameworks (POMOFs). Two new Dawson-type POMOFs, named CUST-961 and CUST-962, have been designed and synthesized via combining Htzbc selected by hard and soft acid and base theory and density functional theory calculation, transition metal ions, alkali metal ions (Na