Tailored Postsynthetic Nitration of a Hypercrosslinked Polymer for Single-Step Ethylene Purification from a Ternary C Gas Mixture.

Purifying CH from a ternary CH/CH/CH mixture poses a substantial industrial challenge due to their close physical and chemical properties. In this study, we introduce an innovative design approach to regulate and optimize the nitration degree of a hypercrosslinked polymer to achieve targeted separation performance. We synthesized a porous organic polymer (HCP) using the solvent knitting method and carried out its postsynthetic nitration, resulting in HCP-NO-1 and HCP-NO-2 with different nitration degrees.

Extended MOF-74-Type Variant with an Azine Linkage: Efficient Direct Air Capture and One-Pot Synthesis.

Direct air capture (DAC) shows considerable promise for the effective removal of CO; however, materials applicable to DAC are lacking. Among metal-organic framework (MOF) adsorbents, diamine-Mg(dobpdc) (dobpdc = 4,4-dioxidobiphenyl-3,3'-dicarboxylate) effectively removes low-pressure CO, but the synthesis of the organic ligand requires high temperature, high pressure, and a toxic solvent. Besides, it is necessary to isolate the ligand for utilization in the synthesis of the framework.

Boc Protection for Diamine-Appended MOF Adsorbents to Enhance CO Recyclability under Realistic Humid Conditions.

Among the various metal-organic framework (MOF) adsorbents, diamine-functionalized Mg(dobpdc) (dobpdc = 4,4-dioxidobiphenyl-3,3'-dicarboxylate) shows remarkable carbon dioxide removal performance. However, applying diamine-functionalized Mg(dobpdc) in practical applications is premature because it shows persistent performance degradation under real flue gas conditions containing water vapor owing to diamine loss during wet cycles. To address this issue, we employed hydrophobic carbonate compounds to protect diamine groups in een-Mg(dobpdc) (, een = N-ethylethylenediamine).

Porous organic materials for iodine adsorption.

The nuclear industry will continue to develop rapidly and produce energy in the foreseeable future; however, it presents unique challenges regarding the disposal of released waste radionuclides because of their volatility and long half-life. The release of radioactive isotopes of iodine from uranium fission reactions is a challenge. Although various adsorbents have been explored for the uptake of iodine, there is still interest in novel adsorbents.

Aminal-Linked Covalent Organic Frameworks with hxl-a and Quasi-hcb Topologies for Efficient C H /C H Separation.

In reticular chemistry, topology is a powerful concept for defining the structures of covalent organic frameworks (COFs). However, due to the lack of diversity in the symmetry and reaction stoichiometry of the monomers, only 5% of the two-dimensional topologies have been reported to be COFs. To overcome the limitations of COF connectivity and pursue novel topologies in COF structures, two aminal-linked COFs, KUF-2 and KUF-3, are prepared, with dumbbell-shaped secondary building units.

Switchable Xe/Kr Selectivity in a Hofmann-Type Metal-Organic Framework via Temperature-Responsive Rotational Dynamics.

The development of adsorbents for Kr and Xe separation is essential to meet industrial demands and for energy conservation. Although a number of previous studies have focused on Xe-selective adsorbents, stimuli-responsive Xe/Kr-selective adsorbents still remain underdeveloped. Herein, a Hofmann-type framework Co(DABCO)[Ni(CN) ] (referred to as CoNi-DAB; DABCO = 1,4-diazabicyclo[2,2,2]octane) that provides a temperature-dependent switchable Xe/Kr separation performance is reported.

Electronic Effect-Modulated Enhancements of Proton Conductivity in Porous Organic Polymers.

We proposed a new strategy to maximize the density of acidic groups by modulating the electronic effects of the substituents for high-performance proton conductors. The conductivity of the sulfonated 1-MeL40-S with methyl group corresponds to 2.29×10  S cm at 80 °C and 90 % relative humidity, remarkably an 22100-fold enhancement over the nonsulfonated 1-MeL40.

Protocol for the fabrication of porous organic polymer-based composites for photocatalytic degradation of a sulfur mustard simulant.

Although porous organic polymer (POP) has been explored as a promising photosensitizer, its powdered form makes it unfavorable for practical applications. Here, we demonstrate a protocol for fabricating imidazoline-based POP composites using fabric and sponge as substrates. This fabrication is limited to POPs with aldehyde containing organic building blocks.

Correction: Post-synthetic modifications in porous organic polymers for biomedical and related applications.

Correction for 'Post-synthetic modifications in porous organic polymers for biomedical and related applications' by Ji Hyeon Kim , , 2022, , 43-56, https://doi.org/10.1039/D1CS00804H.

Functionalization of Diamine-Appended MOF-Based Adsorbents by Ring Opening of Epoxide: Long-Term Stability and CO Recyclability under Humid Conditions.

Although diamine-appended metal-organic framework (MOF) adsorbents exhibit excellent CO adsorption performance, a continuous decrease in long-term capacity during repeated wet cycles remains a formidable challenge for practical applications. Herein, we present the fabrication of diamine-appended Mg(dobpdc)-alumina beads (-; een = -ethylethylenediamine; = number of carbon atoms attached to epoxide) coated with hydrophobic silanes and alkyl epoxides. The reaction of epoxides with diamines in the portal of the pore afforded sufficient hydrophobicity, hindered the penetration of water vapor into the pores, and rendered the modified diamines less volatile.

High Gravimetric and Volumetric Ammonia Capacities in Robust Metal-Organic Frameworks Prepared via Double Postsynthetic Modification.

Ammonia is a promising energy vector that can store the high energy density of hydrogen. For this reason, numerous adsorbents have been investigated as ammonia storage materials, but ammonia adsorbents with a high gravimetric/volumetric ammonia capacity that can be simultaneously regenerated in an energy-efficient manner remain underdeveloped, which hampers their practical implementation. Herein, we report Ni_acryl_TMA (TMA = thiomallic acid), an acidic group-functionalized metal-organic framework prepared via successive postsynthetic modifications of mesoporous NiClBTDD (BTDD = bis(1-1,2,3,-triazolo [4,5-],-[4',5'-]) dibenzo[1,4]dioxin).

High Ammonia Uptake of a Metal-Organic Framework Adsorbent in a Wide Pressure Range.

Although numerous porous adsorbents have been investigated for NH capture applications, these materials often exhibit insufficient NH uptake, low NH affinity at the ppm level, and poor chemical stability against wet NH conditions. The NH capture properties of M (dobpdc) complexes (M=Mg , Mn , Co , Ni , and Zn ; dobpdc =4,4-dioxidobiphenyl-3,3-dicarboxylate) that contain open metal sites is presented. The NH uptake of Mg (dobpdc) at 298 K was 23.