High and Highly Anisotropic Proton Conductivity in Organic Molecular Porous Materials

Abstract

Isostrukturelle cucurbiturilbasierte organische poröse Materialien, deren 1D‐Kanäle mit einer Wasser‐Säure‐Anordnung gefüllt sind, unterscheiden sich abhängig von der Art und Menge der in den Kanälen vorliegenden Säuremoleküle in der Protonenleitfähigkeit. Das deutlich anisotrope Leitungsverhalten der Materialien wurde mithilfe von Leitfähigkeitsmessung an Einkristallen untersucht.

Component Selection in the Self‐Assembly of Palladium(II) Nanocages and Cage‐to‐Cage Transformations

“…[19] Recently, Kim et al reported anisotrop- ic proton conductivity of cucurbituril-based porous organic materials in high humidity regions. [20] We recently reported water-soluble discrete architectures that have also been recognized as a suitable class of materials for proton conduction under low-humidity conditions. [14] Self-assembled insoluble charged materials are more appealing to explore under high humidity conditions to achieve better conductivity.…”

Superprotonic Conductivity in Flexible Porous Covalent Organic Framework Membranes

“…[8b] It is noteworthy that af ew porous materials like metal-organic frameworks (MOFs), and COFs with loaded carrier molecules,h ave been tested for proton conduction. [6][7][8][9] However, the poor mechanical flexibility,l ow crystallinity,a nd disrupted pore channels (because of the high pressure employed for pellet making [6a, 8c] )h as often resulted in inferior proton conductivity and subsequently,i np oor performance under the real PEMFC operating conditions.T herefore,t he immediate challenge is to engineer as elf-standing flexible membrane consisting of crystalline COF particles without losing its structural characteristics such as crystallinity and porosity.Keeping this in perspective,herein we present astrategic approach to synthesize as eries of self-standing,f lexible, porous,C OF membranes (COFMs) as proton reservoirs for subsequent use in PEM fuel cells.I nt he present study,w e have fabricated three COFs [TpBD(Me) 2 ,T pAzo,a nd TpBpy] by using an amino p-toluene sulfonic acid (PTSA·H 2 O) salt mediated, slow-crystallization approach. [10] Herein PTSA·H 2 Ohas two advantages:First of all, it serves as ac o-reagent during the baking process,r esulting in an extensive increment in the crystallinity as well as the porosity of the COFMs.…”

“…[8b] It is noteworthy that af ew porous materials like metal-organic frameworks (MOFs), and COFs with loaded carrier molecules,h ave been tested for proton conduction. [6][7][8][9] However, the poor mechanical flexibility,l ow crystallinity,a nd disrupted pore channels (because of the high pressure employed for pellet making [6a, 8c] )h as often resulted in inferior proton conductivity and subsequently,i np oor performance under the real PEMFC operating conditions.T herefore,t he immediate challenge is to engineer as elf-standing flexible membrane consisting of crystalline COF particles without losing its structural characteristics such as crystallinity and porosity.…”

Crystal structure of catena-poly[diaquabis(μ2-3-carboxybenzene-1,2-dicarboxylato-1:2κ2 O:O′)-(μ2-1,4-bis(2-ethylbenzimidazol-1-ylmethyl)-benzene-1:1′κ2 N:N′)dizinc(II)], [Zn2(C26H26N4)(C9H4O6)2(H2O)2]

“…Hitherto, much e ort has been done on the rational design and controlled synthesis of desired and attractive coordination polymers [5,6]. And it indicates that the selection of multifunctional organic ligands containing appropriate coordination sites and proper spacers would be critical step to get complexes with versatile structures and desired properties [7][8][9].…”