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Covalent organic frameworks are a novel class of crystalline porous polymers that enable molecular design of extended polygonal skeletons to attain well-defined porous structures. However, construction of a framework that allows remote control of pores remains a challenge. Here we report a strategy that merges covalent, noncovalent, and photo chemistries to design photoresponsive frameworks with reversibly and remotely controllable pores. We developed a topology-guided multicomponent polycondensation system that integrates protruded tetrafluoroazobenzene units as photoresponsive sites on pore walls at predesigned densities, so that a series of crystalline porous frameworks with the same backbone can be constructed to develop a broad spectrum of pores ranging from mesopores to micropores. Distinct from conventional azobenzene-based systems, the tetrafluoroazobenzene frameworks are highly sensitive to visible lights to undergo high-rate isomerization. The photoisomerization exerts profound effects on pore size, shape, number, and environment, as well as molecular uptake and release, rendering the system able to convert and switch pores reversibly and remotely with visible lights. Our results open a way to a novel class of smart porous materials with pore structures and functions that are convertible and manageable with visible lights.
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Alzheimer's disease (AD) is the most common neurodegenerative disease, with sporadic form being the predominant type. Neuroinflammation plays a critical role in accelerating pathogenic processes in AD. Mesenchymal stem cell (MSC)-derived small extracellular vesicles (MSC-sEVs) regulate inflammatory responses and show great promise for treating AD. Induced pluripotent stem cell (iPSC)-derived MSCs are similar to MSCs and exhibit low immunogenicity and heterogeneity, making them promising cell sources for clinical applications. This study examined the anti-inflammatory effects of MSC-sEVs in a streptozotocin-induced sporadic mouse model of AD (sAD). The intracisternal administration of iPSC-MSC-sEVs alleviated NLRP3/GSDMD-mediated neuroinflammation, decreased amyloid deposition and neuronal apoptosis, and mitigated cognitive dysfunction. Furthermore, it explored the role of miR-223-3p in the iPSC-MSC-sEVs-mediated anti-inflammatory effects in vitro. miR-223-3p directly targeted NLRP3, whereas inhibiting miR-223-3p almost completely reversed the suppression of NLRP3 by MSC-sEVs, suggesting that miR-223-3p may, at least partially, account for MSC-sEVs-mediated anti-inflammation. Results obtained suggest that intracisternal administration of iPSC-MSC-sEVs can reduce cognitive impairment by inhibiting NLRP3/GSDMD neuroinflammation in a sAD mouse model. Therefore, the present study provides a proof-of-principle for applying iPSC-MSC-sEVs to target neuroinflammation in sAD.
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Doença de Alzheimer , Modelos Animais de Doenças , Vesículas Extracelulares , Células-Tronco Mesenquimais , MicroRNAs , Proteína 3 que Contém Domínio de Pirina da Família NLR , Animais , Camundongos , Doença de Alzheimer/patologia , Doença de Alzheimer/terapia , Doença de Alzheimer/metabolismo , Vesículas Extracelulares/metabolismo , Células-Tronco Pluripotentes Induzidas/metabolismo , Inflamação/patologia , Inflamação/metabolismo , Células-Tronco Mesenquimais/metabolismo , Camundongos Endogâmicos C57BL , MicroRNAs/metabolismo , MicroRNAs/genética , Doenças Neuroinflamatórias/metabolismo , Doenças Neuroinflamatórias/patologia , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismoRESUMO
Aquaporin-4 (AQP4) is essential for normal functioning of the brain's glymphatic system. Impaired glymphatic function is associated with neuroinflammation. Recent clinical evidence suggests the involvement of glymphatic dysfunction in LRRK2-associated Parkinson's disease (PD); however, the precise mechanism remains unclear. The pro-inflammatory cytokine interferon (IFN) γ interacts with LRRK2 to induce neuroinflammation. Therefore, we examined the AQP4-dependent glymphatic system's role in IFNγ-mediated neuroinflammation in LRRK2-associated PD. We found that LRRK2 interacts with and phosphorylates AQP4 in vitro and in vivo. AQP4 phosphorylation by LRRK2 R1441G induced AQP4 depolarization and disrupted glymphatic IFNγ clearance. Exogeneous IFNγ significantly increased astrocyte expression of IFNγ receptor, amplified AQP4 depolarization, and exacerbated neuroinflammation in R1441G transgenic mice. Conversely, inhibiting LRRK2 restored AQP4 polarity, improved glymphatic function, and reduced IFNγ-mediated neuroinflammation and dopaminergic neurodegeneration. Our findings establish a link between LRRK2-mediated AQP4 phosphorylation and IFNγ-mediated neuroinflammation in LRRK2-associated PD, guiding the development of LRRK2 targeting therapy.
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@#Vaccines with novel adjuvants have been listed abroad,while in China,except for aluminum adjuvants widely used in vaccine research and production,few other novel adjuvants have been successfully listed. This paper briefly summarized the source,development history,research progress on biological activity and immune mechanism as well as safety evaluation of the novel BC adjuvant system with independent intellectual property right which has been applied to the vaccine in clinical research stage,so as to provide theoretical support for selection of the adjuvant in the development of novel vaccine.
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BACKGROUND: In China, on more than 100 weekends or holidays, only on-duty cardiologists are available during admissions. This study aimed to analyze the impact of admission time on major adverse cardiovascular events (MACEs) in patients with acute myocardial infarction (AMI). METHODS: This prospective observational study enrolled patients with AMI between October 2018 and July 2019. The patients were assorted into off-hour (admitted on weekends or national holidays) and on-hour groups. The outcome was MACEs at admission and 1 year after discharge. RESULTS: A total of 485 patients with AMI were enrolled in this study. The occurrence of MACEs was significantly higher in the off-hour group compared with the on-hour group (P < .05). Multivariate regression analysis showed that age (HR = 1.047, 95% CI: 1.021-1.073), blood glucose level (HR = 1.029, 95% CI: 1.009-1.050), multivessel disease (HR = 1.904, 95% CI: 1.074-3.375), and off-hour hospital admission (HR = 1.849, 95% CI: 1.125-3.039) were all independent risk factors for in-hospital MACEs, while percutaneous coronary intervention (HR = 0.210, 95% CI: 0.147-0.300) and on-hour admission (HR = 0.723, 95% CI: 0.532-0.984) were protective factors for MACEs 1 year after discharge. CONCLUSION: The "off-hour effect" still existed in patients with AMI, and the risk of MACEs in the hospital and 1 year after discharge was higher for off-hour admission.
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Infarto do Miocárdio , Intervenção Coronária Percutânea , Humanos , Infarto do Miocárdio/epidemiologia , Infarto do Miocárdio/terapia , Fatores de Risco , Estudos Prospectivos , China/epidemiologia , Resultado do TratamentoRESUMO
Alachlor is one of the most widely used herbicides and can also be a carcinogenic compound. It is of great significance to establish a sensitive analytical method for the determination of alachlor in the environment and organisms. In this study, a high-performance liquid chromatography tandem mass spectrometry cubed (LC/MS3) method was developed and validated to quantify alachlor in human breast cancer cells (McF-7 cells). The cell samples were processed by simple protein precipitation with acetonitrile, then the analytes were separated on a Waters AcQuity® UPLC BEH (2.1 × 50 mm I.D, 1.7 µm) column using the gradient elution with solvent A (0.1 % formic acid) and solvent B (acetonitrile) at a flow rate of 0.5 mL/min. MS3 detection in positive ion mode was used to detect the analytes. The MRM3 transitions at m/z 270.1 â 238.0 â 162.1 and 312.2 â 238.1 â 147.2 were used to determine alachlor and butachlor, respectively. The run time for each sample was only 4 min. This method was validated for various parameters including accuracy, precision, selectivity, linearity, lower limit of quantitation (LLOQ), etc. The LC/MS3 assay was linear in the concentration range 0.5-50 ng/mL (R2 ≥ 0.995). For all concentrations, the precision is < 9.49 %, and the intra-day and intra-day accuracy is < 13.05 %. Cytotoxic potential of alachlor against McF-7 cell lines was measured by MTT method after 48 h of incubation. For alachlor, half maximal inhibitory concentration (IC50) on McF-7 cells was 87.95 µg/mL. This method was successfully applied to cellular pharmacokinetic study of alachlor in McF-7 cells after administration with a dose of 20 µg/mL.
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Espectrometria de Massas em Tandem , Ratos , Animais , Humanos , Cromatografia Líquida , Ratos Sprague-Dawley , Espectrometria de Massas em Tandem/métodos , Células MCF-7 , Reprodutibilidade dos Testes , Cromatografia Líquida de Alta Pressão/métodosRESUMO
Butachlor is an aromatic amide compound that plays a role as a herbicide, a xenobiotic, and an environmental contaminant. The aim of this work was to develop a highly selective and sensitive ultra-performance liquid chromatography-tandem mass spectrometry method based on the tandem mass spectrometry cubed technique to determine butachlor in a biological matrix. Butachlor and internal standard acetochlor were separated on a Waters Acquity ultra-performance liquid chromatography BEH C18 column (2.1 × 50 mm, 1.7 µm) with gradient elution using 0.1% formic acid aqueous solution (A) and acetonitrile (B) as mobile phases. The transitions selected for tandem mass spectrometry cubed quantitative analysis in positive ion mode were: for butachlor, mass-to-charge ratio 312.2â238.1â162.1; for acetochlor, mass-to-charge ratio 270.1â224.0â148.1. The total running time for each sample was 5.5 min. The ultra-performance liquid chromatography-tandem mass spectrometry cubed method showed a linear relationship (R2 ≥ 0.995) in the concentration range of 0.5-100 ng/ml. The intra and interday accuracies are within the range of -10.6%-4.3% and precisions are between 4.48% and 13.14%. The novelty of the method is the use of tandem mass spectrometry cubed scanning mode, which improves selectivity and sensitivity. The results indicated that butachlor was cellular toxic. The safety of butachlor should be considered when it is used as a herbicide.
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Espectrometria de Massas em Tandem , Espectrometria de Massas em Tandem/métodos , Cromatografia Líquida de Alta Pressão/métodos , Reprodutibilidade dos Testes , Cromatografia LíquidaRESUMO
Polypropylene glycol (PPG) is a commonly used synthetic polymer in many fields. Investigating the toxicity and pharmacokinetic behavior of PPG polymers is necessary and important for evaluating their safety in medicine and daily cosmetics. In this study, PPG425, PPG1K and PPG2K were selected as the target polymers for cytotoxicity and cellular pharmacokinetics study of PPG polymers. Structural diversity and polydisperse molecular weights (MWs) are significant challenges for quantification of PPG polymers by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Collision induced dissociation in source or collision cell generated a series of PPG-related product ions at m/z 59.0, 117.1, 175.1, 233.2, 291.2, 349.3, 407.2, 465.3 and 523.5 corresponding to fragments containing 1, 2, 3, 4, 5, 6, 7, 8, 9 repeating propylene oxide subunits. PPG425 was determined by the sum of the MRM acquisitions used the transitions [M+H]+1 precursor ions â product ions. PPG1K and PPG2K were determined by the MRM acquisitions used the transitions [M+H]+1 precursor ions â product ions at m/z 233.2(four subunits)â59.0(one subunit). Based on the collision induced disassociation technique and structural specific product ions, pharmacokinetic studies of PEG425, PPG1K and PPG2K were successfully conducted in McF-7 cells. The experimental results revealed that PPG polymers are not biologically inert and they can enter into McF-7 cells. The safety of PPG polymers should be considered when they are used as pharmaceutical or cosmetic excipients.
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Cosméticos , Espectrometria de Massas em Tandem , Cromatografia Líquida/métodos , Íons , Polímeros/química , Propilenoglicóis , Espectrometria de Massas em Tandem/métodosRESUMO
Despite rapid progress over the past decade, most polycondensation systems even upon a small structural variation of the building units eventually result in amorphous polymers other than the desired crystalline covalent organic frameworks. This synthetic dilemma is a central and challenging issue of the field. Here we report a novel approach based on module-patterned polymerization to enable efficient and designed synthesis of crystalline porous polymeric frameworks. This strategy features a wide applicability to allow the use of various knots of different structures, enables polycondensation with diverse linkers, and develops a diversity of novel crystalline 2D polymers and frameworks, as demonstrated by using the C=C bond-formation polycondensation reaction. The new sp2 -carbon frameworks are highly emissive and enable up-conversion luminescence, offer low band gap semiconductors with tunable band structures, and achieve ultrahigh charge mobilities close to theoretically predicted maxima.
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A high-performance liquid chromatography tandem mass spectrometry cubed (HPLC/MS3) method was developed and validated to quantify lamotrigine in human plasma with carbamazepine as an internal standard. The HPLC/MS/MS system is composed of a Shimadzu UFLC XR high-performance liquid chromatograph coupled with a hybrid linear ion trap triple quadrupole mass spectrometer. Following simple protein precipitation with methanol, the separation of lamotrigine and carbamazepine was performed on an Agilent Poroshell 120 SB-C18 column (4.6 × 50 mm, 2.7 µm) using gradient elution with 0.1% formic acid in water (solvent I) and 0.1% formic acid in methanol (solvent II) at a flow rate of 0.8 mL min-1. The total run time for each sample was 5 min. The method was validated for accuracy, precision, linearity, lower limit of quantification (LLOQ), selectivity, and other parameters. The LC/MS3 method was linear in the concentration range of 0.50-50.0 µg mL-1 (R2 ≥ 0.995). The LLOQ was 0.5 µg mL-1, requiring only 30 µL of human plasma. Intra- and inter-day accuracies were <6.17% and precisions were <11.4% at all concentrations. The absolute recoveries (%) and matrix effect (%) for lamotrigine in human plasma were between 83.8 and 90.7. The developed and validated LC-MS3 assay was successfully applied to monitor the lamotrigine levels in human plasma after the administration of lamotrigine.
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Espectrometria de Massas em Tandem , Cromatografia Líquida de Alta Pressão , Cromatografia Líquida , Humanos , Lamotrigina , Reprodutibilidade dos TestesRESUMO
The ordered π skeletons of covalent organic frameworks make them viable light-emitting materials but their limited tunability has precluded further implementation. Here we report the synthesis of hydrazone-linked frameworks which are stable in water, acid, and base, and demonstrate their utility as a platform for light emission. The polygonal backbone is designed to be luminescent and partially π conjugated while the pore wall is docked with single atom or unit to induce resonance, hyperconjugation, and tautomerization effects. These effects can be transmitted to the backbone, so that the framework can emit three primary colors of light. The wall can be perturbated with multiple surface sites, rendering the material able to edit diverse emission colors in a predesignable and digital way. The systems show high activity, stability, tunability, and sensibility: a set of features attractive for light-emitting and sensing applications.
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Hydroxide anion transport is essential for alkaline fuel cells, but hydroxide anion has an inherently low conductivity owing to its small diffusion coefficient and high mass. Ordered open channels found in covalent organic frameworks are promising as pathways to enable hydroxide anion transport, but this remains to be explored. Here we report designed synthesis of anionic covalent organic frameworks that promote hydroxide anion transport across the one-dimensional channels. Engineering cationic chains with imidazolium termini onto the pore walls self-assembles a supramolecular interface of single-file hydroxide anion chains in the channels. The frameworks facilitate hydroxide anion transport to achieve an exceptional conductivity of 1.53 × 10-2 S cm-1 at 80 °C, which is 2-6 orders of magnitude higher than those of linear polymers and other porous frameworks. Impedance spectroscopy at different temperatures and studies on deuterated samples reveal that hydroxide anions transport via a proton-exchange hopping mechanism. These results open a way to design framework materials for energy conversions via engineering an anionic interface.
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BACKGROUND: Contrast encephalopathy is a rare complication of carotid artery stenting (CAS). Contrast encephalopathy is a diagnosis of exclusion that often needs to be distinguished from high perfusion syndrome, cerebral haemorrhage, subarachnoid haemorrhage (SAH), cerebral infarction and so on. CASE PRESENTATION: In this study, we report on a 70-year-old man who was admitted to the hospital with transient ischaemic attacks presenting paroxysmal weakness of limbs in the previous 2 years. He had severe stenosis of the left internal carotid artery diagnosed by digital subtraction angiography (DSA) and underwent CAS. Two hours after the operation, the patient developed paralysis of the right upper limb, unclear speech, fever and restlessness. Emergency skull computed tomography (CT) showed swelling and a linear high-density area in the left cerebral hemisphere. To clarify the components of this high-density area in the traditional CT, the patient had spectral CT, which made the diagnosis of the leakage of contrast clear. After 1 week of supportive treatment, the patient improved. CONCLUSIONS: Spectral CT can easily distinguish the components of high-density areas on traditional CT, which is haemorrhage, calcification or iodine contrast leakage. Therefore, spectral CT is worth consideration for the differential diagnosis of complications of vascular intervention.
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Encefalopatias , Artéria Carótida Interna/cirurgia , Meios de Contraste/efeitos adversos , Tomografia Computadorizada por Raios X , Idoso , Angiografia Digital/efeitos adversos , Encefalopatias/induzido quimicamente , Encefalopatias/diagnóstico por imagem , Artéria Carótida Interna/diagnóstico por imagem , Estenose das Carótidas/diagnóstico por imagem , Estenose das Carótidas/cirurgia , Humanos , MasculinoRESUMO
BACKGROUND: Cerebral infarction caused by pituitary apoplexy (PA) is rare. To characterize the clinical features of cerebral infarction caused by PA, we performed a systematic review. SUMMARY: The clinical symptoms are mainly sudden headache, hemiplegia, visual impairment, disturbance of consciousness, and ophthalmalgia in patients with cerebral infarction caused by PA. Treatment for this type of infarction is different from treatment for general acute cerebral infarction. Compared to patients who underwent emergency surgery and conservative treatment, patients treated with delayed surgery showed a better prognosis and a lower mortality rate. Compared to patients who underwent craniotomy or conservative treatment, patients who underwent transsphenoidal surgery (TSS) not only improved well but also showed a lower mortality rate. Key Messages: PA rarely causes cerebral infarction, which is a critical condition with a poor prognosis and is more common in men. Delayed surgery and TSS appear to confer a better prognosis in patients with this condition.
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Infarto Cerebral/etiologia , Apoplexia Hipofisária/complicações , Infarto Cerebral/terapia , Humanos , Pessoa de Meia-IdadeRESUMO
Long noncoding RNAs (lncRNAs) have been validated to mediate the development of atherosclerosis (AS). In the present study, the molecular mechanisms and functions of lncRNA nuclear paraspeckle assembly transcript 1 (NEAT1) in the advancement of human aortic endothelial cells (HAECs) were investigated. The levels of lncRNANEAT1 and miR638 expression in clinical samples and cells were explored via quantitative reverse transcription polymerase chain reaction. Colony formation and CCK8 assays were performed to determine the proliferative capacity of cells, and the apoptotic capacity of cells was analyzed on the basis of apoptotic cell proportion and caspase3 activity. Then, the proportion of cells and correlations among phosphoglycerate kinase 1 (PGK1), NEAT1, and miR638 were determined through RNA immunoprecipitation and luciferase assays and bioinformatics analysis. Moreover, the expression levels of Ki67, proliferating cell nuclear antigen, PGK1, Bax, Bcl2, (p)mTOR, (p)AKT, and ßcatenin were analyzed via western blot analysis. In the serum of patients with AS and HAECs induced by oxidized lowdensity lipoprotein (oxLDL), the expression level of miR638 was decreased, whereas that of NEAT1 was increased. After oxLDL therapy, NEAT1 knockdown suppressed HAEC proliferation and stimulated HAEC apoptosis, which could be reversed by the miR638 inhibitor. NEAT1 inhibited miR638 expression through direct mutual action. The following mechanical investigations revealed that PGK1 was a miR638 target, whose expression was increased by NEAT1, a competing endogenous RNA of miR638. Additionally, the miR638 inhibitor contributed to proliferation and suppressed apoptosis through the activation of the AKT/mTOR signaling pathway in oxLDLinduced HAECs. NEAT1 adjusted the AKT/mTOR signaling pathway via miR638 in oxLDLinduced HAECs to accelerate their proliferation and impede their apoptosis. This result revealed that NEAT1 may be valuable in the treatment of AS.
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Aterosclerose/genética , Células Endoteliais/citologia , MicroRNAs/genética , RNA Longo não Codificante/genética , Aterosclerose/metabolismo , Linhagem Celular , Proliferação de Células , Sobrevivência Celular , Células Endoteliais/química , Células Endoteliais/efeitos dos fármacos , Feminino , Técnicas de Silenciamento de Genes , Humanos , Lipoproteínas LDL/efeitos adversos , Masculino , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais , Serina-Treonina Quinases TOR/metabolismoRESUMO
Transformation of carbon dioxide to high value-added chemicals becomes a significant challenge for clean energy studies. Here a stable and conductive covalent organic framework was developed for electrocatalytic carbon dioxide reduction to carbon monoxide in aqueous solution. The cobalt(II) phthalocyanine catalysts are topologically connected via robust phenazine linkage into a two-dimensional tetragonal framework that is stable under boiling water, acid, or base conditions. The 2D lattice enables full π conjugation along x and y directions as well as π conduction along the z axis across the π columns. With these structural features, the electrocatalytic framework exhibits a faradaic efficiency of 96 %, an exceptional turnover number up to 320 000, and a long-term turnover frequency of 11 412â hour-1 , which is a 32-fold improvement over molecular catalyst. The combination of catalytic activity, selectivity, efficiency, and durability is desirable for clean energy production.
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Development of porous materials combining stability and high performance has remained a challenge. This is particularly true for proton-transporting materials essential for applications in sensing, catalysis and energy conversion and storage. Here we report the topology guided synthesis of an imine-bonded (C=N) dually stable covalent organic framework to construct dense yet aligned one-dimensional nanochannels, in which the linkers induce hyperconjugation and inductive effects to stabilize the pore structure and the nitrogen sites on pore walls confine and stabilize the H3PO4 network in the channels via hydrogen-bonding interactions. The resulting materials enable proton super flow to enhance rates by 2-8 orders of magnitude compared to other analogues. Temperature profile and molecular dynamics reveal proton hopping at low activation and reorganization energies with greatly enhanced mobility.
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A strategy is presented for the synthesis of crystalline porous covalent organic frameworks via topology-templated polymerization. The template is based on imine-linked frameworks and their (001) facets seed the C=C bond formation reaction to constitute 2D sp2 carbon-conjugated frameworks. This strategy is applicable to templates with different topologies, enables designed synthesis of frameworks that cannot be prepared via direct polymerization, and creates a series of sp2 carbon frameworks with tetragonal, hexagonal, and kagome topologies. The sp2 carbon frameworks are highly luminescent even in the solid state and exhibit topology-dependent π transmission and exciton migration; these key fundamental π functions are unique to sp2 carbon-conjugated frameworks and cannot be accessible by imine-linked frameworks, amorphous analogues, and 1D conjugated polymers. These results demonstrate an unprecedented strategy for structural and functional designs of covalent organic frameworks.
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Covalent organic frameworks (COFs) are a class of crystalline porous organic polymers with permanent porosity and highly ordered structures. Unlike other polymers, a significant feature of COFs is that they are structurally predesignable, synthetically controllable, and functionally manageable. In principle, the topological design diagram offers geometric guidance for the structural tiling of extended porous polygons, and the polycondensation reactions provide synthetic ways to construct the predesigned primary and high-order structures. Progress over the past decade in the chemistry of these two aspects undoubtedly established the base of the COF field. By virtue of the availability of organic units and the diversity of topologies and linkages, COFs have emerged as a new field of organic materials that offer a powerful molecular platform for complex structural design and tailor-made functional development. Here we target a comprehensive review of the COF field, provide a historic overview of the chemistry of the COF field, survey the advances in the topology design and synthetic reactions, illustrate the structural features and diversities, scrutinize the development and potential of various functions through elucidating structure-function correlations based on interactions with photons, electrons, holes, spins, ions, and molecules, discuss the key fundamental and challenging issues that need to be addressed, and predict the future directions from chemistry, physics, and materials perspectives.
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A strategy based on covalent organic frameworks for ultrafast ion transport involves designing an ionic interface to mediate ion motion. Electrolyte chains were integrated onto the walls of one-dimensional channels to construct ionic frameworks via pore surface engineering, so that the ionic interface can be systematically tuned at the desired composition and density. This strategy enables a quantitative correlation between interface and ion transport and unveils a full picture of managing ionic interface to achieve high-rate ion transport. Moreover, the effect of interfaces was scaled on ion transport; ion mobility is increased in an exponential mode with the ionic interface. This strategy not only sets a benchmark system but also offers a general guidance for designing ionic interface that is key to systems for energy conversion and storage.