Lanthanide‐Based Metal‐Organic‐Frameworks for Proton Conduction and Magnetic Properties

Abstract

The coexistence of proton conductivity and magnetic properties in metal organic frameworks (MOFs) is simply an attractive prospect to design and create multifunctional molecular materials. However, the simultaneity of interesting magnetic properties (e.g. magnetocaloric effect, slow magnetic relaxation or magnetic ordering) and proton conduction in a MOF is very implausible to be observed, as chemical and structural necessities are absolutely poles apart for either of the properties. In this context, lanthanide-based metal-organic frameworks (LMOFs) have emerged as an intriguing class of materials to observe such coexistence in few cases. In this perspective, the advantages of combining lanthanide ions and organic acids as ligands to construct a proton-conductive magnetic metal organic framework are briefly discussed. The current status of this specific research area regarding some fascinating LMOFs exhibiting proton conductivity and magnetic properties is reviewed in detail. Also, a future perspective of such materials is discussed.

Water-driven reversible switching of single-ion magnetism and proton conduction in a dysprosium sulfonate

“…13 Additionally, bifunctional molecular magnetic materials combining SMM behaviour and proton conductivity are also an ongoing interest. 14 As an illustration, Ohkoshi and co-workers reported a cyanide-bridged Yb( iii ) coordination polymer exhibiting field-induced SIM behaviour with a high proton conductivity. 15 a To date, however, proton conductive molecular nanomagnets are very rare.…”

Dysprosium(III) Metal–Organic Framework Demonstrating Ratiometric Luminescent Detection of pH, Magnetism, and Proton Conduction

“…Moreover, the optimal proton conductivity and activation energy of Dy-MOF are comparable to those of the reported conductive multifunctional Dy III -based MOFs under similar conditions (Table ). We noted that the proton conduction supplied in this case is a rare example of 4f-based multifunctional MOFs with both slow magnetic relaxation and luminescence sensing. , …”

“…We noted that the proton conduction supplied in this case is a rare example of 4fbased multifunctional MOFs with both slow magnetic relaxation and luminescence sensing. 48,61…”

A Proton Conducting Cobalt(II) Spin Crossover Complex

“…Regarding conducting materials, proton‐conducting materials have gained increasing interest due to their significant applications for electrochemical devices [17–19] . Proton‐conductive magnetic compounds have been studied for years and led to a lot of fascinating multifunctional materials, including proton‐conductive magnetic ordering materials [20–25] . Interestingly, some single‐molecule magnets (SMMs) are emerging as new bifunctional magnetic materials with proton conduction [26–29] .…”