Covalent organic frameworks (COFs) are an emerging class of porous crystalline polymers with wide range potential applications. However, the availability three-dimensional (3D) COFs is still limited, and their synthesis confined to high-temperature solvothermal method. Here, we report for first time a general simple strategy produce series 3D ionic liquid (IL)-containing (3D-IL-COFs) by using IL as green solvent. The syntheses carried out at ambient temperature pressure accompanied high...

Chemical functionalization of covalent organic frameworks (COFs) is critical for tuning their properties and broadening potential applications. However, the introduction functional groups, especially to three-dimensional (3D) COFs, still remains largely unexplored. Reported here a general strategy generating 3D carboxy-functionalized COF through postsynthetic modification hydroxy-functionalized COF, first time exploration in selective extraction lanthanide ions. The obtained shows high...

Covalent organic frameworks (COFs) are an emerging class of porous crystalline polymers with broad potential applications. So far, the availability three-dimensional (3D) COFs is limited and more importantly only one type covalent bond has been successful used for 3D COF materials. Here, we report a new synthetic strategy based on dual linkages that leads to COFs. The obtained show high specific surface areas large gas uptake capacities, which makes them top material uptake. Furthermore,...

Covalent organic frameworks (COFs) have emerged as functional materials for various potential applications. However, the availability of three-dimensional (3D) COFs is still limited, and nearly all them exhibit neutral porous skeletons. Here we report a general strategy to design positively charged 3D ionic by incorporation cationic monomers in framework. The obtained are built 3-fold interpenetrated diamond net show impressive surface area CO2 uptakes. ion-exchange ability has been...

The development of three-dimensional (3D) functionalized covalent–organic frameworks (COFs) is critical importance for expanding their potential applications. However, the introduction functional groups in 3D COFs remains largely unexplored. Herein, we report first example Salphen-based (3D-Salphen-COFs) and metal-containing counterparts (3D-M-Salphen-COFs). These exhibit high crystallinity specific surface area addition to excellent chemical stability. Furthermore, Cu(II)-Salphen COF...

The functionalization of three-dimensional (3D) covalent organic frameworks (COFs) is essential to broaden their applications. However, the introduction groups with electroactive abilities into 3D COFs still very limited. Herein we report first case tetrathiafulvalene-based (3D-TTF-COFs) non- or 2-fold interpenetrated pts topology and tunable electrochemical activity. obtained show high crystallinity, permanent porosity, large specific surface area (up 3000 m2/g). Furthermore, these...

Three-dimensional (3D) covalent organic frameworks (COFs) are excellent crystalline porous polymers for numerous potential applications, but their building units and topological nets have been limited. Herein we report the design synthesis of first 3D large-pore COF with stp topology constructed from a 6-connected triptycene-based monomer. The new (termed JUC-564) has high specific surface area (up to 3300 m2 g-1), largest pore size among COFs (43 Å), record-breaking low density materials...

Abstract The electrochemical double‐layer capacitors (EDLCs) are highly demanded electrical energy storage devices due to their high power density with thousands of cycle life compared pseudocapacitors and batteries. Herein, a series capacitor cells composed exfoliated mesoporous 2D covalent organic frameworks (e‐COFs) that able perform excellent charge is reported. selected COFs possess eclipsed AA layer‐stacking mode 3.4 nm square‐like open channels, favorable BET surface areas (up 1170 m...

The development of three-dimensional (3D) covalent organic frameworks (COFs) with large pores and high surface areas is great importance for various applications. However, it remains a major challenge due to the frequent structural interpenetration pore collapse after removal guest species situated in pores. Herein, we report first time series 3D mesoporous COFs through general method steric hindrance engineering. By placing methoxy methyl groups strategically on monomers, can obtain...

Benefiting from their unique structural merits, three-dimensional (3D) large-pore COF materials demonstrate high surface areas and interconnected large channels, which makes these promising in practical applications. Unfortunately, functionalization strategies application research are still absent structures. To this end, a series of functional 3D stp-topologized COFs designed based on porphyrin or metalloporphyrin moieties, named JUC-640-M (M = Co, Ni, H). Interestingly, JUC-640-H exhibits...

ConspectusAs one of the most attractive members in porous materials family, covalent organic frameworks (COFs) have been reported thousands times since their first discovery 2005, covering design, synthesis, and applications. However, an overwhelming majority these COFs are based on two-dimensional (2D) topologies while three-dimensional (3D) numbered fewer than 100 up to date. In fact, baring enhanced specific surface area, interconnected channels, well-exposed functional moieties, highly...

The growth of three-dimensional covalent organic frameworks (3D COFs) with new topologies is still considered as a great challenge due to limited availability high-connectivity building units. Here we report the design and synthesis 3D triptycene-based COFs, termed JUC-568 JUC-569, following deliberate symmetry-guided principle. By combining triangular prism (6-connected) node planar triangle (3-connected) or another node, targeted COFs adopt non-interpenetrated ceq acs topology,...

Covalent organic frameworks (COFs), possessing pre-designable structures and tailorable functionalities, are promising candidates for photocatalysis. Nevertheless, the most studied imine-linked COFs (Im-COFs) usually suffer from unsatisfactory stability photocatalytic performance. To meet this challenge, a series of highly stable enaminone-linked (En-COFs) have been synthesized afford much improved visible-light-driven hydrogen production activities, ranging 44 to 1078 times that...

Owing to the finite building blocks and difficulty in structural identification, it remains a tremendous challenge elaborately design synthesize three-dimensional covalent organic frameworks (3D COFs) with predetermined topologies. Herein, we report first two cases of 3D COFs non-interpenetrated hea net, termed JUC-596 JUC-597, by using combination tetrahedral triangular prism units. Due presence triptycene functional groups fluorine atoms, exhibits an exceptional performance H2 adsorption...

The local electric field (LEF) plays an important role in the catalytic process; however, precise construction and manipulation of microenvironment around active site remains a significant challenge. Here, we have developed supramolecular strategy for implementation LEF by introducing host macrocycle 18-crown-6 (18C6) into cobalt phthalocyanine (CoPc)-containing covalent organic framework (COF). Utilizing interaction between 18C6 potassium ion (K+), locally enhanced K+ concentration CoPc can...

In recent years, many studies extract aspects from user reviews and integrate them with ratings for improving the recommendation performance. The common mentioned in a user’s product’s indicate indirect connections between product. However, these aspect-based methods suffer two problems. First, are usually very sparse, which is caused by sparsity of user-product interactions diversity individual users’ vocabularies. Second, interests on could be different respect to products, assumed static...

Abstract A three‐component palladium‐catalyzed aminocarbonylation of aryl and heteroaryl sp 2 C−H bonds using nitroarenes as the nitrogen source was achieved Mo(CO) 6 reductant origin CO. This intermolecular bond functionalization does not requires any exogenous ligand to be added, our mechanism experiments indicate that palladacycle catalyst serves two roles in reaction: reduce nitroarene a nitrosoarene activate bond.

The development of a mild, low cost and green synthetic route for covalent organic frameworks (COFs) is highly desirable in order to open the door practical uses this new family crystalline porous solids. Herein, we report general facile strategy prepare series microporous or mesoporous COFs by β-ketoenamine based Michael addition-elimination reaction aqueous systems at ambient temperature pressure. This synthesis method not only produces COFs, but also can be carried out with high rate...

Food recommender systems play an important role in assisting users to identify the desired food eat. Deciding what eat is a complex and multi-faceted process, which influenced by many factors such as ingredients, appearance of recipe, user's personal preference on food, various contexts like had been eaten past meals. This work formulates recommendation problem predicting user recipes based three key that determine choice namely, 1) (and other users') history; 2) ingredients recipe; 3)...