title: Hydrogen-Bonded Organic Frameworks (HOFs): A New Class of Porous Crystalline Proton-Conducting Materials.
abstract: 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.
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Centre for Research in Energy & Sustainable Materials, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune-, 411008, India.
authors.forename: Avishek
authors.initials: A
authors.lastname: Karmakar
authors.affiliation: Department of Physical and Materials Chemistry Division, National Chemical Laboratory (NCL), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India.
authors.forename: Rajith
authors.initials: R
authors.lastname: Illathvalappil
authors.affiliation: Department of Physical and Materials Chemistry Division, National Chemical Laboratory (NCL), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India.
authors.forename: Bihag
authors.initials: B
authors.lastname: Anothumakkool
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Centre for Research in Energy & Sustainable Materials, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune-, 411008, India.
authors.forename: Arunabha
authors.initials: A
authors.lastname: Sen
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Centre for Research in Energy & Sustainable Materials, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune-, 411008, India.
authors.forename: Partha
authors.initials: P
authors.lastname: Samanta
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Centre for Research in Energy & Sustainable Materials, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune-, 411008, India.
authors.forename: Aamod V
authors.initials: AV
authors.lastname: Desai
authors.affiliation: Department of Physical and Materials Chemistry Division, National Chemical Laboratory (NCL), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India.
authors.forename: Sreekumar
authors.initials: S
authors.lastname: Kurungot
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Centre for Research in Energy & Sustainable Materials, IISER Pune, Dr. Homi Bhabha Road, Pashan, Pune-, 411008, India. sghosh@iiserpune.ac.in.
authors.forename: Sujit K
authors.identifier: 0000-0002-1672-4009
authors.initials: SK
authors.lastname: Ghosh
keywords: guanidinium; hydrogen-bonded organic frameworks; porous crystalline frameworks; proton conduction; sulfonates