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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. (Russia) 09/27/2020 19:08
В американском штате Арканзас работник банка прогулялся по парку «Алмазный кратер» и нашел рекордно большой алмаз в девять карат. «Он весил 9,07 карата, а нашел я его 9.07. Мне кажется, это уникальное событие!» — отметил он. Мужчина говорит, что предпочитает искать драгоценности на поверхности.

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