Covalent organic frameworks (COFs) are crystalline, highly porous, two- or three-dimensional polymers with tunable topology and functionalities. Because of their higher chemical stabilities in comparison to boron-linked counterparts, imine β-ketoenamine linked COFs have been utilized for a broad range applications, including gas storage, heterogeneous catalysis, energy storage devices, proton-conductive membranes. Herein, we report the synthesis porous chemically stable acetylene (−C≡C−)...

Covalent organic frameworks (COFs) are of interest for many applications originating from their mechanically robust architectures, low density, and high accessible surface area. Depending on linkers binding patterns, COFs mainly exhibit microporosity, even though with small mesopores have been reported using extended linkers. For some applications, especially when fast mass transport is desired, hierarchical pore structures an ideal solution, e.g., micropores providing large areas larger...

The Yamamoto polymerization has been used for the synthesis of conjugated, microporous polymer networks. is advantageous as only a single, halogen-functionalized monomer can be to form Polymer networks are presented based on spirobifluorene and benzene units, which reveal high surface areas up 1275 m2/g. Furthermore, copolymerization carried out using additionally linear linkers during polymerization. nearly regular incorporation such units into enables tailor luminescence properties materials.

We report on the realization of an all-optical transistor by mapping gate and source photons into strongly interacting Rydberg excitations with different principal quantum numbers in ultracold atomic ensemble. obtain a record switch contrast 40% for coherent input mean photon number one demonstrate attenuation transmission over ten single photon. use our optical to nondestructive detection atom fidelity 0.72(4).

Conjugated microporous polymer networks containing thienyl units are synthesized from two different monomers using oxidative polymerization. The resulting high surface area materials present interface rich, conjugated-polymer architectures, and promising candidates for advanced material applications, such as in the field of organic electronics, sensors solar cells, or supports metal catalysts.

Abstract The fabrication of macroscopic objects from covalent organic frameworks (COFs) is challenging but great significance to fully exploit their chemical functionality and porosity. Herein, COF/reduced graphene oxide (rGO) aerogels synthesized by a hydrothermal approach are presented. COFs grow in situ along the surface 2D sheets, which stacked 3D fashion, forming an ultralight aerogel with hierarchical porous structure after freeze-drying, can be compressed expanded several times...

Crystalline and porous covalent organic frameworks (COFs) with donor-acceptor moieties in their backbone are utilized as initiators for visible light induced radical polymerization. The COFs efficient photoinitiators, maintaining structural integrity several cycles.

Covalent organic frameworks (COFs) are structurally tuneable, porous and crystalline polymers constructed through the covalent attachment of small building blocks as elementary units. Using myriad such blocks, a broad spectrum functionalities has been applied for COF syntheses applications, including heterogeneous catalysis. Herein, we report synthesis new family COFs using novel acridine linker benzene-1,3,5-tricarbaldehyde derivatives bearing variable number hydroxy groups. With absorption...

Lithium-sulphur (Li-S) batteries are a promising alternative power source, as they can provide higher energy density than current lithium-ion batteries. Porous materials often used cathode act host for sulphur in such Recently, covalent organic frameworks (COFs) have also been used, however typically suffer from stability issues, resulting limited and thus insufficient durability under practical conditions applications. Herein, we report the synthesis of crystalline porous imine-linked...

Abstract Two emerging material classes are combined in this work, namely polymeric carbon nitrides and microporous polymer networks. The former, nitrides, composed of amine‐bridged heptazine moieties showed interesting performance as a metal‐free photocatalyst. These materials have, however, to be prepared at high temperatures, making control their chemical structure difficult. latter, networks have received increasing interest due surface area, giving rise applications gas storage or...

No slow down: A microporous recyclable heterogeneous catalyst made from a 1,1′-binaphthalene-2,2′-diol (binol)-derived phosphoric acid chloride is as active the corresponding homogeneous when using same mass of both in different reactions. Reaction rates, yields, and enantioselectivities are comparable.

Organic zeolite: A microporous, covalent organic network with high surface area was synthesized by polymerization of [B(C6F4Br)4]−. The countercations, located within the pore channels, are highly accessible and can be easily exchanged, comparable to extra-framework cations in zeolites. In this way a [MnII(bpy)]2+ complex immobilized network. As service our authors readers, journal provides supporting information supplied authors. Such materials peer reviewed may re-organized for online...

Water splitting using polymer photocatalysts is a key technology to truly sustainable hydrogen-based energy economy. Synthetic chemists have intuitively tried enhance photocatalytic activity by tuning the length of π-conjugated domains their semiconducting polymers, but increasing flexibility and hydrophobicity ever-larger organic building blocks leads adverse effects such as structural collapse inaccessible catalytic sites. To reach ideal optical band gap about 2.3 eV, A library eight...

Recently, covalent organic frameworks (COFs) have emerged as an interesting class of porous materials, featuring tunable porosity and fluorescence properties based on reticular construction principles. Some COFs display highly emissive monocolored luminescence, but attaining white-light emission from is difficult it must account for a wide wavelength range. White-light desired solid-state lighting applications, obtaining usually demands the combination red-, green-, blue-light components....

Covalent triazine frameworks (CTFs) are prepared from amorphous, non-porous polymer networks using a facile and scalable procedure.

The targeted thermal condensation of a hexaazatriphenylene-based precursor leads to porous and oxidation-resistant ("noble") carbons. Simple the pre-aligned molecular produces nitrogen-rich carbons with C2 N-type stoichiometry. Despite absence any porogen metal species involved in synthesis, specific surface areas reach up 1000 m2 g-1 due significant microporosity materials. content type nitrogen is controllable by carbonization temperature whilst porosity remains largely unaffected at same...

We present, for the first time, covalent triazine frameworks functionalized with acetylacetonate group (acac-CTFs). They are obtained from polymerization of 4,4′-malonyldibenzonitrile under ionothermal conditions and exhibit BET surface areas up to 1626 m2/g. The materials show excellent CO2 uptake (3.30 mmol/g at 273 K 1 bar), H2 storage capacity (1.53 wt % 77 a good CO2/N2 selectivity (up 46 298 K). enhanced value due presence dual polar sites (N O) throughout material. In addition,...

Oxygen activation is a critical step in ubiquitous heterogeneous oxidative processes, most prominently catalysis, electrolysis, and pharmaceutical applications. We present here our findings on metal-free O

Multicomponent reactions (MCRs) offer a platform to create different chemical structures and linkages for highly stable covalent organic frameworks (COFs). As an illustrative example, the multicomponent Povarov reaction generates 2,4-phenylquinoline from aldehydes amines in presence of electron-rich alkenes. In this study, we introduce new domino generate unprecedented 2,3-phenylquinoline COFs epoxystyrene. This work thus presents, first time, structural isomeric produced by reactions....

Abstract Microporous polymer networks, composed of structure‐directing monomers (tectons), can exhibit high permanent surface area and porosity. By choice suitable tectons various functionalities be introduced into such networks. Here we introduce chiral BINOL derivatives as novel to generate microporosity in The use enables the formation networks solely out enantiomerically pure compounds. This porous network used a heterogeneous organocatalyst asymmetric reactions gives higher...

Partially delocalized charge is generated in Fe-doped NiCo₂S₄ nanosheets, which show significantly enhanced adsorption ability towards ionic liquid ions.

Abstract A modified one‐pot Sonogashira cross‐coupling reaction based on a copper‐free methodology has been applied for the synthesis of conjugated microporous poly(aryleneethynylene) networks (CMPs) from readily available iodoarylenes and 1,3,5‐triethynylbenzene. The polymerization reactions were carried out by using equimolar amounts halogen terminal alkyne moieties with extremely small loadings palladium catalyst as low 0.65 mol %. For first time, CMPs rigorously controlled structures...

The electrochemical conversion of low-cost precursors into high-value chemicals using renewably generated electricity is a promising approach to build up an environmentally friendly energy cycle, including storage element. large-scale implementation such process can, however, only be realized by the design cost-effective electrocatalysts with high efficiency and highest stability. Here, we report synthesis N B codoped porous carbons. constructed B–N motives combine abundant unpaired...