Water-mediated proton conduction for a highly stable strontium-organic framework from imidazole multi-carboxylate ligand

High proton conductivity modulated by active protons in 1D ultra-stable metal–organic coordination polymers: a new insight into the coordination interaction/ability of metal ions

“…The facts indicate they have excellent chemical durability over a broad pH range, comparable or even superior to most of the reported MOFs (Table S5 in ESI†). 49–64…”

Different Phenomena in Magnetic/Electrical Properties of Co(II) and Ni(II) Isomorphous MOFs

“…Fortunately, we successfully obtained two new MOFs based on H 3 L for the first time, formulated as {[Co 2 (H 2 O) 2 (L)­(OH)]·2.5H 2 O·0.5DMF} n ( 1 ) (DMF = N , N -dimethylformamide) and {[Ni 2 (H 2 O) 2 (L)­(OH)]·1.75H 2 O} n ( 2 ), which exhibit different magnetic interactions. MOFs based on nitrogen heterocyclic polycarboxylic acid ligands also have excellent performance in the field of proton conduction. − The difference in coordination ability of nitrogen and oxygen atoms may result in incompletely coordinated carboxylic acid groups in the obtained MOFs, which is helpful to construct proton conduction channels. The carboxylic acid groups in these two MOFs we obtained are all coordinated; however, considering the presence of hydroxyl groups and water molecules in the frameworks, which can establish proton conduction channels to help proton migration, we have studied their proton conduction performance and further explored the conduction mechanism.…”

Hydration-Facilitated Coordination Tuning of Metal–Organic Frameworks toward Water-Responsive Fluorescence and Proton Conduction

“…Water, as a mild protic solvent, is able to easily protonate for boosting proton conduction and permits the coordination with nodes via oxygen atoms (i.e., hydration) to generate structural transformations, − offering the opportunity to exploit the robust multimode response behavior in MOFs. − Generally, the hydration of MOFs would lead to the modulation on the conformations and corresponding frontier orbital energy gaps of ligands and nodes, , benefiting for the color switch or intensity changes of the fluorescence signal. − Meanwhile, the hydration of MOFs could improve the proton carrier density in pores or channels and offer more hydrogen-bond donors to optimize the hydrogen-bond network, − leading to the efficient proton transfer pathway. − Such water-dependence proton conduct behavior is beneficial to improve the conductivity and further design the novel water-induced responsive systems. , However, the design of water-induced multimode responsive MOF remain in infancy, and the understanding of the hydration-facilitated responsive mechanism is still limited, far from the rapid development of multimode responsive materials.…”