A proton conductive hydrogen-bonded framework incorporating 18-crown-6-ether and dicarboxy-o-terphenyl moieties

Abstract

To date, proton-conducting organic crystalline materials based on crown ethers are rarely integrated. In this work, we revealed that the flexible organic 18-crown-6 derivatives with one or two 4,4’-dicarboxy-o-terphenyl (CT)...

Design Rules of Hydrogen-Bonded Organic Frameworks with High Chemical and Thermal Stabilities

“…In MOFs, interpenetration has been shown to be an important structural feature since it (1) enhances framework stability, (2) imparts flexible and dynamic characteristics, and (3) allows for fine-tuning of pore environments. , Varying the concentrations of reactants, as well as the use of templates or epitaxial synthetic strategies, offers systematic control over the level of interpenetration of MOFs (Figure ). ,,,,− …”

Pyrene-Based Hydrogen-Bonded Organic Frameworks as New Emitters with Porosity- and Aggregation-Induced Enhanced Electrochemiluminescence for Ultrasensitive MicroRNA Assay

“…Hydrogen-bonded organic frameworks (HOFs) as a promising class of porous materials are self-assembled by organic building blocks through hydrogen-bonding interactions . Similar to MOFs, HOFs own the traits of large surface area, high porosity, and tailored pore size/shape, exhibiting broad application prospects in gas storage and separation, catalysis, proton conduction, and so on. Notably, HOFs that benefit from H-bonds possess unique merits such as facile synthesis, solution processability, and easy recovery. , In particular, the metal-free nature of HOFs makes them superior candidates for fabricating sensors on account of their excellent biocompatibility and low biotoxicity .…”

Alkoxy-Functionalized Amines as Single-Component Water-Lean CO2 Absorbents with High Efficiency: The Benefit of Stabilized Carbamic Acid

“…38 Notably, the alkoxy chain has been proved by recent reports to be a viable hydrogen bond acceptor that could bind the acidic proton to form multiple complexation. 58,59 We then propose a simple structural modification method for aliphatic primary amines that involves fixation of an appropriate alkoxy substituent to such a cheap and versatile industrial commodity, aiming to acquire reduced operating viscosity that enables smooth processing at the water-lean status under industrially relevant conditions and, in the meantime, increase capture capacity via stabilization of the in situ formed carbamic acid through intramolecular hydrogen bonding.…”

“…In our continuous efforts to develop new concepts as well as efficient strategies for CO 2 capture and further transformation, − we envision that the viscosity of several traditional aliphatic amines at the CO 2 -saturated state could be significantly reduced though careful alkoxy functionalization. , The alkoxy arm embedded within the amine structure could create more free volume through its high conformational flexibility, thereby greatly enhance the flowability, and would ultimately intensify the interior mass transfer behavior to increase CO 2 capacity and thermoreversibility. , Ether-functionalized ionic liquids has also been separately studied for CO 2 /SO 2 capture through chemi- and/or physisorption. − Meanwhile, carbamic acid is considered to be a feasible form of sequestrated CO 2 in the amine scrubbing process due to the full utilization of the nitrogen moiety (1:1 stoichiometry between CO 2 and nitrogen) and its relatively easy reversal compared with that of ammonium carbamate. ,, Furthermore, intramolecular hydrogen bonding is preferable if carbamic acid as an uncharged species dominates within the chemisorption system after CO 2 uptake, thus leading to lower operating viscosity than in the intermolecular hydrogen bonding scenarios . Notably, the alkoxy chain has been proved by recent reports to be a viable hydrogen bond acceptor that could bind the acidic proton to form multiple complexation. , We then propose a simple structural modification method for aliphatic primary amines that involves fixation of an appropriate alkoxy substituent to such a cheap and versatile industrial commodity, aiming to acquire reduced operating viscosity that enables smooth processing at the water-lean status under industrially relevant conditions and, in the meantime, increase capture capacity via stabilization of the in situ formed carbamic acid through intramolecular hydrogen bonding.…”