Covalent organic frameworks are a family of crystalline porous materials with promising applications. Although active research on the design and synthesis covalent has been ongoing for almost decade, mechanisms formation crystallites remain poorly understood. Here we report hollow spherical framework mesoporous walls in single-step template-free method. A detailed time-dependent study sphere reveals that an inside-out Ostwald ripening process is responsible formation. The synthesized spheres...

Covalent organic frameworks (COFs) have emerged as promising electrode materials in supercapacitors (SCs). However, their insoluble powder-like nature, poor capacitive performance pristine form, integrated with inferior electrochemical stability is a primary concern for long-term use devices. Keeping this perspective, herein we report redox active and hydrogen bonded COF ultrahigh conc. H2SO4 (18 M), HCl (12 M) NaOH (9 M). The as-synthesized fabricated thin sheets were efficiently employed...

Poor mechanical stability of the polymer electrolyte membranes remains one bottlenecks towards improving performance proton exchange membrane (PEM) fuel cells. The present work proposes a unique way to utilize crystalline covalent organic frameworks (COFs) as self-standing, highly flexible further boost material without compromising its innate structural characteristics. as-synthesized p-toluene sulfonic acid loaded COF (COFMs) show highest conductivity (as high 7.8×10-2 S cm-1 ) amongst all...

We have demonstrated a hydroquinone stitched β-ketoenamine COF acting as an efficient organic cathode in aqueous rechargeable zinc ion battery.

A rapid and scalable synthesis of six new imine-linked highly porous crystalline COFs is presented that feature exceptionally high chemical stability in harsh environments including conc. H2 SO4 (18 m), HCl (12 NaOH (9 m). This because the presence strong interlayer C-H⋅⋅⋅N hydrogen bonding among individual layers, which provides significant steric hindrance a hydrophobic environment around imine (-C=N-) bonds, thus preventing their hydrolysis such an abrasive environment. These were further...

The key factor responsible for fast diffusion and mass transfer through a porous material is the availability of widely open pore interior having complete accessibility from their surface. However, because highly stacked nature, ordered two-dimensional (2D) materials fail to find real-world applicability, as it difficult take advantage structure, especially inner cores. In this regard, three-dimensional (3D) nanostructures constructed layered crystallites could prove be advantageous. real...

Insolubility of covalent organic frameworks (COFs) in solvents is one the major obstacles for potential application these extended networks such as drug delivery, sensing, optoelectronics, and semiconductor device fabrication. The present work proposes a unique way to make uniform, solution-processable, crystalline, porous COF nanospheres directly from homogeneous solution amine aldehyde via spatial temporal control nucleation growth. This strategy direct simultaneously showcases caliber...

Abstract Two new chemically stable triazine‐ and phenyl‐core‐based crystalline porous polymers (CPPs) have been synthesized using a single‐step template‐free solvothermal route. Unique morphological diversities were observed for these CPPs [2,3‐DhaTta (ribbon) 2,3‐DhaTab (hollow sphere)] by simply altering the linker planarity. A detailed time‐dependent study established significant correlation between molecular level structures of building blocks with morphology CPPs. Moreover, DFT was done...

The induction of macro and mesopores into two-dimensional porous covalent organic frameworks (COFs) could enhance the exposure intrinsic micropores toward pollutant environment, thereby, improving performance. However, challenge is to build a continuous hierarchically macro-architecture crystalline materials in bulk scale. In this regard, we have strategized novel synthetic method create COF foams consisting ordered (2-2.2 nm) disordered meso macropores (50 nm 200 μm) as well (1.5 mm 2 cm)....

The crystal packing of organic chromophores has a profound impact on their photophysical properties. Molecular engineering is generally incapable producing precisely spaced arrays molecules for use in photovoltaics, light-emitting diodes, and sensors. A promising alternative strategy the incorporation into crystalline metal–organic frameworks (MOFs), leading to matrix coordination-induced emission (MCIE) upon confinement. However, it remains unclear how precise arrangement defects dictates...

Abstract Poor mechanical stability of the polymer electrolyte membranes remains one bottlenecks towards improving performance proton exchange membrane (PEM) fuel cells. The present work proposes a unique way to utilize crystalline covalent organic frameworks (COFs) as self‐standing, highly flexible further boost material without compromising its innate structural characteristics. as‐synthesized p ‐toluene sulfonic acid loaded COF (COFMs) show highest conductivity (as high 7.8×10 −2 S cm −1 )...

The redox-active and porous structural backbone of covalent organic frameworks (COFs) can facilitate high-performance electrochemical energy storage devices. However, the utilities such 2D materials as supercapacitor electrodes in advanced self-charging power-pack systems have been obstructed due to poor electrical conductivity subsequent indigent performance. Herein, we report an effective strategy enhance COF thin sheets through situ solid-state inclusion carbon nanofibers (CNF) into...

Single-electron transfer (SET) plays a critical role in many chemical processes, from organic synthesis to environmental remediation. However, the selective reduction of inert substrates (E

Abstract A rapid and scalable synthesis of six new imine‐linked highly porous crystalline COFs is presented that feature exceptionally high chemical stability in harsh environments including conc. H 2 SO 4 (18 m ), HCl (12 NaOH (9 ). This because the presence strong interlayer C−H⋅⋅⋅N hydrogen bonding among individual layers, which provides significant steric hindrance a hydrophobic environment around imine (−C=N−) bonds, thus preventing their hydrolysis such an abrasive environment. These...

Porous solids that can be switched between different forms with distinct physical properties are appealing candidates for separation, catalysis, and host-guest chemistry. In this regard, porous organic cages (POCs) of profound interest because their solution-state accessibility. However, the application POCs is limited by poor chemical stability. Synthesis an exceptionally stable imine-linked (4+6) cage (TpOMe-CDA) reported using 2,4,6-trimethoxy-1,3,5-triformyl benzene (TpOMe) as a...

Two low molecular weight metallohydrogels (ZALA and CALA) have been synthesized from an amino-acid-based ligand precursor (LA) two different metal salts [zinc acetate dihydrate (ZA) cadmium (CA), respectively. These hydrogels show a unique chemically stimulated interconversion to each other via reversible gel–sol–gel pathway. This programmable gel–sol system satisfies logic operations of basic Boolean (INHIBIT) gate. Also, these can be degraded into MOF phases at room temperature...

Abstract Two new chemically stable triazine‐ and phenyl‐core‐based crystalline porous polymers (CPPs) have been synthesized using a single‐step template‐free solvothermal route. Unique morphological diversities were observed for these CPPs [2,3‐DhaTta (ribbon) 2,3‐DhaTab (hollow sphere)] by simply altering the linker planarity. A detailed time‐dependent study established significant correlation between molecular level structures of building blocks with morphology CPPs. Moreover, DFT was done...

Abstract In this work we have achieved epoxide to cyclic carbonate conversion using a metal‐free polymeric catalyst under ambient CO 2 pressure (1.02 atm) balloon setup. The triazine containing polymer (CYA‐ANIS) was prepared from cyanuric chloride (CYA−Cl) and o‐dianisidine (ANIS) in anhydrous DMF as solvent by refluxing the N gas environment. presence of amine functional groups results adsorption up 7 cc/g at 273 K. This inspired us utilize for series functionalised epoxides into their...

Conjugated microporous polymers (CMPs) are porous organic materials that display (semi)conducting behavior due to their highly π-conjugated structures. As such, they promising next-generation for applications requiring both conductivity and porosity, such as supercapacitive energy storage electrochemical sensing. However, most CMPs related aromatic frameworks (PAFs) currently prepared using expensive transition metal-based catalysts under solvothermal conditions, significantly increasing...

Introduction Idiopathic granulomatous mastitis (IGM) is an evolving problem with varied presentation. No definite treatment guidelines are available at present that may reduce rate of recurrence. Current evidence suggests a ductal pathology behind IGM, which leads to periductal mastitis, leakage and sinus/fistula formation. Thus, excision the sinus/fistulous tract en-bloc wide local (WLE) lesion could be curative. The objective this study was look for basic aetiology IGM evaluate...

Metal–organic frameworks (MOFs) are porous, crystalline materials constructed from organic linkers and inorganic nodes with potential utility in gas separation, drug delivery, sensing, catalysis. Small variations the MOF synthesis conditions can lead to a range of accessible divergent chemical or photophysical properties. New methods controllably access phases tailored properties would broaden scope MOFs that be reliably prepared for specific applications. Herein, we demonstrate simply...

Abstract Porous solids that can be switched between different forms with distinct physical properties are appealing candidates for separation, catalysis, and host–guest chemistry. In this regard, porous organic cages (POCs) of profound interest because their solution‐state accessibility. However, the application POCs is limited by poor chemical stability. Synthesis an exceptionally stable imine‐linked (4+6) cage ( TpOMe‐CDA ) reported using 2,4,6‐trimethoxy‐1,3,5‐triformyl benzene (TpOMe) as...