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Milenio (Mexico) 09/27/2020 19:22
Derivado de una oportuna intervención policial, la Secretaría de Seguridad Ciudadana (SSC) del Municipio de Puebla detuvo en la colonia Los Volcanes a Mario “N.”, de 32 años de edad, por su probable participación en hechos con apariencia de delito de robo. Personal de la Dirección de Emergencias y Respuesta Inmediata (DERI), tomó conocimiento sobre una petición de ayuda en la Avenida 23 Poniente, motivo por el cual Policías Municipales de la Región Centro, Zona Cinco, se aproximaron brevemente al lugar. Una vez en el punto, los elementos se entrevistaron con una persona quien señaló a un hombre como responsable de desapoderarlo de una bicicleta de montaña marca Scott, tipo Spark RC 900, color negro con dorado, valuada en más de 300 mil peso.
Reactions of two magnesium(I) compounds, [{(ArNacnac)Mg}2] (ArNacnac = [HC(MeCNAr)2]‐Ar = mesityl (Mes) or o‐xylyl (Xyl)), with CO in the presence of [Mo(CO)6] lead to the reductive hexamerization of CO, and formation of magnesium benzenehexolate complexes, [{(ArNacnac)Mg}6(C6O6)].
Organic dyes, emitting in the second near‐infrared (NIR‐II, 900‐1700 nm) window, with high molar extinction coefficient (MEC) and quantum yield (QY) in aqueous is essential for in vivo bioimaging and biosensing. In this work, we developed a dibodipy based J‐aggregated aggregation induced emission (AIE) molecule THPP to meet this aim. THPP exhibits a high MEC of dibodipy structure and has intensified absorption and emission in J‐aggregated state, which significantly enhanced the fluorescence intensity (~55 folds) and extends the maximal absorption/emission wavelengths to 970/1010 nm in NIR‐II region. Based on the bright THPP , imaging with high frame rate (34 frames per second) in a deep ‘valid penetration depth’ up to 6 mm can be achieved.
An amino‐supported solid palladium‐catalyzed oxidative domino reaction has been developed for the diastereoselective construction of alkyne‐substituted cyclopentenol compounds. This hetero­ge­neous catalyst exhibits high efficiency and excellent chemoselectivity, as well as good recyclability. The chemoselectivity of the domino reactions was readily controlled by switching the solvent and catalyst. Chiral syntheses and an oxidative carbocyclization‐borylation reaction have also been developed based on the heterogeneous Pd‐catalyzed domino strategy.
Ru(II) compounds are widely used in catalysis, photocatalysis and medical applications. They are usually obtained in reductive environment as molecular O 2 can oxidize Ru(II) to Ru(III) and Ru(IV). Here we report the design, identification and evolution of an air‐stable surface ‐[bipy‐Ru(II)(CO) 2 Cl 2 ] site that is covalently mounted onto a polyphenylene framework. Such Ru(II) site was obtained by reduction of ‐[bipy‐Ru(III)Cl 4 ] ‐ with simultaneous ligand exchange from Cl ‐ to CO. This structural evolution was witnessed by a combination of in situ X‐ray and infrared spectroscopy studies. The ‐[bipy‐Ru(II)(CO) 2 Cl 2 ] site enables oxidation of CO with a turnover frequency of 0.73 × 10 ‐2 s ‐1 at 462 K, while the Ru(III) site is complete.
A curved non‐alternant polycyclic aromatic hydrocarbon (PAH) containing fused heptagon and pentagon units is presented, as well as its conformational changes upon stepwise oxidation. Single‐crystal X‐ray analyses for neutral, cationic, dicationic, and a mixed valence species 1⋅(1.+)3 enabled the observed functional properties to be related to the molecular and supramolecular structures. Abstract. A curved sp2 carbon scaffold containing fused pentagon and heptagon units (1) was synthesized by Pd‐catalyzed [5+2] annulation from a 3,9‐diboraperylene precursor and shows two reversible oxidation processes at low redox potential, accompanied by a butterfly‐like motion. Stepwise oxidation produced radical cation 1.+ and dication 12+. In the crystal.
The performance of Li‐ion batteries (LIBs) is highly dependent on their interfacial chemistry, which is regulated by electrolytes. Conventional electrolyte typically contains polar solvents to dissociate Li salts. Herein we report a weakly‐solvating electrolyte (WSE) that consists of a pure non‐polar solvent, which leads to a peculiar solvation structure where ion pairs and aggregates prevail under a low salt concentration of 1.0 M. Importantly, WSE forms unique anion‐derived interphases on graphite electrodes that exhibit fast‐charging and long‐term cycling characteristics. First‐principles calculations unravel a general principle that the competitive coordination between anions and solvents to Li ions is the origin of different interfacia.

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