Two polypyridyl copper(II) complexes, [Cu(acac)(p-CPIP)(CH3OH)](NO3) (1) and [Cu(acac)(o-NPIP)(NO3)] (2) (acac = acetylacetonate, p-CPIP 2-(4-chlorophenyl)imidazo[4,5-f]1,10-phenanthroline, o-NPIP 2-(2-nitrophenyl)imidazo[4,5-f]1,10-phenanthroline), have been synthesized characterized by single-crystal analysis, IR electronic spectroscopy. X-ray analyses reveal that both 1 2 possess a triclinic crystal system with Pmn1 mononuclear five-coordinated square pyramidal geometry, which were...

Combining γ-glutamyl transpeptidase and pH dual-responsive sites, an “and” logic gate-based NIR fluorescent probe Si-NH2-Glu was developed for orthotopic breast tumor imaging.

The abnormal microenvironment parameter, viscosity, is closely connected with various diffusion processes, signal transduction, molecule interactions, and diseases. It greatly significant to design viscosity-dependent near-infrared (NIR) small fluorescence probes for visualizing biological processes or diagnosing Herein, through the stepwise modulating structure of silicon–rhodamine fluorophore (SR), we report three viscosity allyl methyl group as rotors, named SR-T-Al, SR-S-Al, SR-T-Me....

Accurate detection of target analytes and generation high-fidelity fluorescence signals are particularly critical in life sciences clinical diagnostics. However, the majority current NIR-I fluorescent probes vulnerable to pH effects resulting signal distortion. In this work, a series fluorescence-tunable pH-independent reported by combining optically tunable groups unsymmetric Si-rhodamines introducing methoxy instead spiro ring on benzene at position 9. To validate concept, leucine...

Enriching the palette of high-performance fluorescent dyes is vital to support frontier biomedical imaging. Although various rhodamine skeletons remain premier type small-molecule fluorophores due apparent high brightness and flexible modifiability, they still suffer from inherent defect small Stokes shift nonideal fluorescence imaging signal-to-background ratio. Especially, rising class dyes, sulfone-substituted xanthone, exhibits great potential, but low chemical stability also pointed out...

We report a novel and practical one-pot Rh(III)-catalyzed strategy to construct benzimidazo[1,2-a]quinolines from readily available imidamides anthranils. The cascade reaction proceeds via C–H amination–cyclization–cyclization process in ionic liquid without any additives possesses simple operation, moderate-to-high yield, broad substrate scope features, which will provide the reference for construction of biologically active fused benzimidazoles.

Aberrant lysosomal alkalization is associated with various biological processes, such as oxidative stress, cell apoptosis, ferroptosis, etc. Herein, we developed a novel aminofluorene-based fluorescence probe named FAN to monitor the alkalization-related processes by its migration from lysosome nucleus. possessed NIR emission, large Stokes shift, high pH stability, and photostability, making it suitable for real-time long-term bioimaging. As lysosomotropic molecule, can accumulate in...

The first example of transition-metal-catalyzed C-H activations 2-phenylisatogens with alkynes and sulfonyl azides has been developed using N-oxide as the directing group. Ru(ii)-Catalyzed alkenylation/cyclization Ir(iii)-catalyzed direct sulfamidation proceeded good yields excellent functional group tolerance. Importantly, these two transformations provided straightforward routes for synthesis indol-3-one derivatives sulfamidated respectively, which might be considerable bioactivities.

Recently, intrinsic antiferromagnetic topological insulator MnBi2Te4 has drawn intense research interest and leads to plenty of significant progress in physics materials science by hosting quantum anomalous Hall effect, axion state, other phases. An essential ingredient realize these states is the magnetic gap surface induced out-of-plane ferromagnetism on MnBi2Te4. However, experimental observations remain controversial. Here, we report observation via point contact tunneling spectroscopy....

A general protocol for the N ‐thioetherification of NH‐sulfoximines has been developed. Catalyzed by [Cu(DMAP) 4 I]I, ‐sulfenyl sulfoximines were synthesized a one‐pot cascade reaction with commercially available thiophenols as sulfur source at room temperature. The mild conditions, is operationally simple, and affords corresponding products good yields excellent tolerance functional groups.

A mild and recyclable protocol to synthesize 1,2-benzothiazines by Rh(III)-catalyzed C–H activation/cyclization of NH-sulfoximines in ionic liquids with high yields is described. broad substrate scope coupling partners applicable this method without any base or acid additives. The catalytic system, namely, Cp*Rh(III)/AgSbF6/[BMIM][PF6], still maintained good activity even after 10 cycles.

A new and metal-free cross-coupling reaction between sulfoximines N-(phenylthio)-succinimides was developed in water, afforded an efficient route for the synthesis of N-sulfenyl sulfoximines. This transformation provides with good functional group tolerance moderate to excellent yields. Moreover, this protocol can be easily scaled up gram level yield.

A new pyrazolate-bridged quasi-hexacopper(II) complex [Cu3(μ3-OH)(μ-pz)3(pzH)3 (μ3-ClO4)]2(μ-ClO4)2 · (CH3OH)0.33 (C2H5OH)0.66 H2O (pz = pyrazolate), 1, has been isolated and characterized by single crystal X-ray diffraction, elemental analysis, IR UV–visible spectra magnetic susceptibilities. The crystallizes in the orthorhombic system, space group Pbca (, No. 61), a 17.771(4) Å, b 16.143(4) c 25.502(6) V 7316(3) Å3, Z 8, F(000) 3521, D 1.576 g cm−3. structure of 1 consists two...

The bandgap characteristics of periodic structures show a great application prospect in seismic isolation and vibration mitigation. A T-shaped partially embedded pile barrier is designed studied based on the Bloch’s theorem. proposed structure fabricated tested field experiment to validate simulation performance. Good agreements are observed between measured corresponding simulated results which present effective for surface waves. influences length soil arrangement investigated. that key...

Due to flexibility, low cost and rapid deployment, wireless sensor networks (WSNs)have been drawing more interest from governments, researchers, application developers, manufacturers in recent years. Nowadays, we are the age of industry 4.0, which traditional industrial control systems will be connected with each other provide intelligent manufacturing. Therefore, WSNs can play an extremely crucial role monitor environment condition parameters for smart factories. Nevertheless, introduction...

Abstract An efficient protocol by Rh-catalyzed direct C–H vinylation of 2-arylpyridines with a commercially available and air-stable potassium vinyl donor has been developed. This method affords the corresponding pyridinyl styrene derivative moderate to excellent yields under mild conditions, which is extremely beneficial total synthesis natural product palmatine.

To alleviate the application limitations of cement-stabilized soil in impermeable engineering and promote recycling waste rubber tires, crumb produced from tires was used to improve properties soil. The effect on permeability under different conditions investigated using compression, compaction, tests. Crumb can effectively impermeability efficiency is between 11% 45%. Cleaning with water Na

In this study, a hemicellulose recovery process was integrated with cold caustic extraction (CCE) in upgrading paper-grade bleached kraft pulp to dissolving grade. Under the conditions of 15% NaOH, 10% consistency, 30℃ and 1 h, softwood purified dissolving-grade 97.57% α-cellulose 1.67% pentosan contents. The spent liquor from sequentially extracted ethanol precipitate recover dissolved hemicelluloses, followed by evaporation ethanol. After hemicelluloses ethanol, can be reused as solution...

Context-based query processing methods are used to capture user intents behind inputs. General context models not flexible or explicable enough for inference, because they either static implicit. This paper improves current model and proposes a novel approach based on associated semantic inference. In our approach, the formal defined is explicit, which convenient explore potential information during processing. Furthermore, dynamically constructed further modified according specific tasks,...

This paper first analyzes the credibility of human society issues, gives a credible model, revealing essence credibility, that man's morality, competence and confidentiality three aspects. Based on these we analyze issue network software, establish general model utility give definition software degree, propose key attributes or evidence credibility: identity evidence, basic norms capability. And finally with reliability, anti-aggressive to measure is proposed. The faults vulnerabilities are...

Cellulose aerogels were prepared through changing the concentration of TEMPO-oxidized cellulose suspension and applying high-pressure homogenization, followed by regular or rapid freeze drying methods. The aerogel was studied scanning electron microscopy, BET analysis (nitrogen gas adsorption), mercury intrusion porosimetry to investigate effect variables on porous properties. In present study, structure well obtained varying NFC approach. specific surface area varied linearly with adjusting...