2 research outputs found
Enhancing Proton Conduction in a Metal–Organic Framework by Isomorphous Ligand Replacement
Using the concept of isomorphous replacement applied
to entire
ligands, a <i>C</i><sub>3</sub>-symmetric trisulfonate ligand
was substituted with a <i>C</i><sub>3</sub>-symmetric trisÂ(hydrogen
phosphonate) ligand in a proton conducting metal–organic framework
(MOF). The resulting material, PCMOF2<sup>1</sup>/<sub>2</sub>, has
its proton conduction raised 1.5 orders of magnitude compared to the
parent material, to 2.1 × 10<sup>–2</sup> S cm<sup>–1</sup> at 90% relative humidity and 85 °C, while maintaining the parent
MOF structure
Achieving Superprotonic Conduction in Metal–Organic Frameworks through Iterative Design Advances
Two
complementary design strategies, isomorphous ligand replacement
and heterocycle doping, have been applied to iteratively enhance the
proton conductivity of a metal–organic framework, β-PCMOF2.
The resulting materials, PCMOF2<sup>1</sup>/<sub>2</sub>(Pz) and PCMOF2<sup>1</sup>/<sub>2</sub>(Tz) (Pz = 1<i>H</i>-pyrazole, Tz =
1<i>H</i>-1,2,4-triazole), have their proton conduction
raised almost 2 orders of magnitude compared to β-PCMOF2. The
bulk conductivities of these materials are over 10<sup>–1</sup> S cm<sup>–1</sup> at 85 °C and 90% relative humidity
(RH), while maintaining the parent MOF structure. A solid state synthetic
route for doping 1-D channels is also presented