Hydrogen-Bonded Organic Frameworks (HOFs): A New Class of Porous Crystalline Proton-Conducting Materials

Two porous hydrogen‐bonded organic frameworks (HOFs) based on arene sulfonates and guanidinium ions are reported. As a result of the presence of ionic backbones appended with protonic source, the compounds exhibit ultra‐high proton conduction values (σ) 0.75× 10−2 S cm−1 and 1.8×10−2 S cm−1 under hu...

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Published in:Angewandte Chemie International Edition 2016-08, Vol.55 (36), p.10667-10671
Main Authors: Karmakar, Avishek, Illathvalappil, Rajith, Anothumakkool, Bihag, Sen, Arunabha, Samanta, Partha, Desai, Aamod V., Kurungot, Sreekumar, Ghosh, Sujit K.
Format: Article
Language:English
Subjects:
Activation energy
Chemical bonds
Conduction
Conductivity
Covalence
Crystal structure
Fuel cells
Fuel technology
Fuels
guanidinium
Humidity
Hydrogen
Hydrogen bonding
hydrogen-bonded organic frameworks
Ions
Membranes
Metal-organic frameworks
Metals
porous crystalline frameworks
Porous materials
Proton conduction
Sulfonates
Temperature effects
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Summary:Two porous hydrogen‐bonded organic frameworks (HOFs) based on arene sulfonates and guanidinium ions are reported. As a result of the presence of ionic backbones appended with protonic source, the compounds exhibit ultra‐high proton conduction values (σ) 0.75× 10−2 S cm−1 and 1.8×10−2 S cm−1 under humidified conditions. Also, they have very low activation energy values and the highest proton conductivity at ambient conditions (low humidity and at moderate temperature) among porous crystalline materials, such as metal–organic frameworks (MOFs) and covalent organic frameworks (COFs). These values are not only comparable to the conventionally used proton exchange membranes, such as Nafion used in fuel cell technologies, but is also the highest value reported in organic‐based porous architectures. Notably, this report inaugurates the usage of crystalline hydrogen‐bonded porous organic frameworks as solid‐state proton conducting materials. H+ conduction: Two porous hydrogen‐bonded organic frameworks (HOFs) based on arene sulfonates and guanidinium ions exhibit ultra‐high proton conductivity (σ), 0.75×10−2 S cm−1 and 1.8×10−2 S cm−1, under humidified conditions. They also have very low activation energies and higher proton conductivity at ambient conditions compared to other porous crystalline materials, such as MOFs and COFs.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201604534