Abstract A multifunctional lanthanide‐organic framework Tb− TCA (H 3 = tricarboxytriphenylamine) comprising a triphenylamine moiety as an efficient luminescence sensitizer is synthesized by solvothermal method and structurally characterized. exhibits lanthanide‐based emission (540 nm) (435 after excitation at 350 nm works luminescent chemosensor towards salicylaldehyde with sensitivity of 10 ppm under optimized conditions. features high concentration Lewis acid Tb 3+ sites base on its...

A facile, efficient, and practical method for copper-catalyzed direct C-H amination of benzoxazoles with formamides or secondary amines has been developed. The system can be performed in the absence external base only requires O(2) even air as oxidant. variety substituted benzoxazol-2-amines were synthesized moderate to excellent yield.

An efficient protocol for the direct synthesis of 4-arylcoumarins via palladium-catalyzed oxidative Heck coupling reaction coumarins and arylboronic acids was developed. 4-Arylcoumarins were obtained in moderate to excellent yields, also showed tolerance toward functional groups such as hydro, methoxy, diethylamino, nitro, chloro groups.

Abstract An efficient protocol for copper‐catalyzed C–S or C–Se bond formation between aryl iodides and easily available chalcogen sources leading to diaryl chalcogenides is reported. A variety of symmetrical sulfides selenides were synthesized in good excellent yields. Unsymmetrical also obtained moderate yields from two different by a one‐pot tandem process. This strategy was further successfully utilized the synthesis 2‐phenylbenzo[ b ]thiophene [1]benzothieno[3,2‐ ]benzothiophene.

A compact two-mode (de)multiplexer [(DE)MUX] based on symmetric Y-junction and multimode interference (MMI) waveguides was designed by 3D beam propagation method (BPM). The phase evolution in the structure discussed detail. Simulations show that optical bandwidth is as large 100 nm (1500 ~1600 nm). (DE)MUX very compared with other kind of mode (DE)MUX. length only 48.8 μm. Simulation also shows fabrication tolerance ± 75 nm.

A practical and ligand-free Cu-catalyzed decarboxylative trifluoromethylation of aryl iodides with sodium trifluoroacetate using Ag2O as a promoter was reported. variety trifluoromethyl-substituted aromatics are synthesized in moderate to excellent yields wide functional-group tolerance under relatively mild reaction conditions.

An efficient Pd-catalyzed desulfitative coupling reaction of sodium arylsulfinates as arylation reagents by C–O bond cleavage aryl triflates was developed. With only 2 mol % Pd(OAc)2 catalyst and XPhos ligand, the proceeded well for a range substrates.

Molecular materials possessing photo-tunable polarization switching is promising for optical switches, smart sensors, and data storage devices. However, it challenging to devise a molecular material featuring simultaneous switchable magnetic dielectric properties with regard non-invasive convenient light stimulus. Herein, we report new Hofmann-type metal-organic framework (MOF) {Fe(bpt)[Pt(CN)4 ]} ⋅ 0.5anth (1, bpt=2,5-bis(4-pyridyl)thiophen; anth=anthracene), which displays thermo-...

Abstract A highly efficient and ligand‐free copper(I) sulfide catalyzed cross‐coupling reaction of aryl iodides with diaryl disulfides was developed. With only 1 mol‐% Cu 2 S as the catalyst, iron powder reductant, K CO 3 base, reacted in DMSO at 90–110 °C for 18–24 h under an atmosphere argon to give corresponding sulfides good excellent yields. In addition, catalyst is recyclable reusable some loss activity.

A new and efficient method for palladium(II) catalytic desulfitative conjugate addition of arylsulfinic acids with α,β-unsaturated carbonyl compound has been developed. The key reacting intermediates including aryl Pd(II) sulfinic intermediate, Pd(II), C═O-Pd complexes were captured by ESI-MS/MS, which provide experimental evidence the understanding mechanism.

A red-light emission nitroreductase-activatable two-photon fluorescent probe, namely <bold>NRP</bold>, was developed for monitoring of degree hypoxia in cells and <italic>in vivo</italic> nitroreductase imaging.

A novel and convenient photo-mediated halogenated spirocyclization of N-(p-methoxyaryl)propiolamides has been developed. The photolysis phenyliodine bis(trifluoroacetate) (PIFA) as an iodination reagent led to iodinated ipso-cyclization under the irradiation a xenon lamp, while brominated or chlorinated was achieved by irradiating mixture PIFA KBr/KCl blue LED. present protocol simply utilizes light safe clean energy source doesn't require any external photocatalyst providing various...

The low corrosion resistance of aluminum alloy materials in chloride environments limits their application light metal structural components. In this study, 434 stainless steel (SS) powders with different numbers scan layers were deposited on T6061 using high-velocity oxygen fuel (HVOF). Tafel curve, electrochemical impedance spectroscopy (EIS), salt spray, and galvanic tests employed to investigate the comprehensive behavior SS coatings a chlorine environment. results showed that porosity...

Introduction. In higher education, the link between sports learning engagement and intrinsic motivation is crucial. While benefit health academics, their long-term motivational mechanisms remain unclear. This study tracks students over time to explore how shapes participation, its trends, implications for university physical education student development. Method. conducted a three-wave (T1, T2 T3), 1.5-year survey of 365 college using questionnaires. Data were grouped, coded, analyzed with...

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXT1,2,3,4-Tetrahydro-8-hydroxyquinoline-Promoted Copper-Catalyzed Coupling of Nitrogen Nucleophiles and Aryl BromidesHuifeng Wang, Yaming Li*, Fangfang Sun, Yang Feng, Kun Jin, Xiuna WangView Author Information State Key Laboratory Fine Chemicals, Dalian University Technology, 116012, China[email protected]Cite this: J. Org. Chem. 2008, 73, 21, 8639–8642Publication Date (Web):October 9, 2008Publication History Received18 July 2008Published online9...

A mild and fast Cu(<sc>i</sc>)-catalyzed trifluoromethylation of coumarins with CF₃SO₂Na TBHP in a continuous-flow reactor has been developed.

A 1D zinc coordination polymer with bright green fluorescence, [Zn(4,4'-bipy)(H2O)4][Zn(4,4'-bipy)(1.5)(L)(H2O)2]2(L).6H2O (L = 4,4'-bis(2-sulfonatostyryl)biphenyl), has been designed, hydrothermally synthesized and characterized; the interesting structure consists of three types infinite chain: a neutral sandwich-like chain, ionic cationic chains.