Highly Active IrO_x Nanoparticles/Black Si Electrode for Efficient Water Splitting with Conformal TiO₂ Interface Engineering

ACS Sustainable Chemistry & Engineering, Год журнала: 2017, Номер 5(11), С. 10940 - 10946

Опубликована: Сен. 28, 2017

Here we report a highly active electrochemical water splitting electrode fabricated from colloidal IrOx nanoparticles and nanoporous Si stabilized by conformal TiO2. The amorphous are for oxygen evolution reaction. However, their application has dilemma that the traditional annealing process could lead to low activities but based without usually exhibited stability. This nanostructured both high as comparable stability thermal electrode. impedance study revealed TiO2 significantly inhibits interface oxidation maintains activity of catalysts. engineering combined with nanocatalysts would be promising strategy achieve balanced splitting.

Язык: Английский

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Switchable Chemoselective Transfer Hydrogenations of Unsaturated Carbonyls Using Copper(I) N-Donor Thiolate Clusters

The Journal of Organic Chemistry, Год журнала: 2018, Номер 83(3), С. 1204 - 1215

Опубликована: Янв. 9, 2018

Unsaturated alcohols and saturated carbonyls are important chemical, pharmaceutical, biochemical intermediates. We herein report an efficient transfer hydrogenation protocol in which conversion of unsaturated carbonyl compounds to either or was catalyzed by Cu(I) N-donor thiolate clusters along with changing hydrogen source (isopropanol butanol) base (NaOH K2CO3). Mechanistic studies supported DFT transition state modeling indicate that such a chemoselectivity can be explained the relative concentrations monohydride protonated hydride complexes each catalytic system.

Язык: Английский

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A cyclometalated Ir(iii)–NHC complex as a recyclable catalyst for acceptorless dehydrogenation of alcohols to carboxylic acids

Dalton Transactions, Год журнала: 2020, Номер 49(46), С. 16866 - 16876

Опубликована: Янв. 1, 2020

In this work, we have synthesized two new [C, C] cyclometalated Ir(iii)-NHC complexes, [IrCp*(C∧C:NHC)Br](1a,b), [Cp* = pentamethylcyclopentadienyl; NHC (2-flurobenzyl)-1-(4-methoxyphenyl)-1H-imidazoline-2-ylidene (a); (2-flurobenzyl)-1-(4-formylphenyl)-1H-imidazoline-2-ylidene (b)] via intramolecular C-H bond activation. The molecular structure of complex 1a was determined by X-ray single crystal analysis. catalytic potentials the complexes were explored for acceptorless dehydrogenation alcohols to carboxylic acids with concomitant hydrogen gas evolution. Under similar experimental conditions, found be slightly more efficient than 1b. Using 0.1 mol% 1a, good-to-excellent yields acids/carboxylates been obtained a wide range alcohols, both aliphatic and aromatic, including those involving heterocycles, in short reaction time low loading catalyst. Remarkably, our method can produce benzoic acid from benzyl alcohol on gram scale catalyst-to-substrate ratio as 1 : 5000 exhibit TON 4550. Furthermore, catalyst could recycled at least three times without losing its activity. A mechanism has proposed based controlled experiments situ NMR study.

Язык: Английский

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One‐Pot Transfer Hydrogenation Reductive Amination of Aldehydes and Ketones by Iridium Complexes “on Water”

European Journal of Organic Chemistry, Год журнала: 2020, Номер 2020(40), С. 6387 - 6391

Опубликована: Сен. 9, 2020

An efficient and practical one‐pot transfer hydrogenation reductive amination of aldehydes ketones with amines has been developed by using iridium complexes as catalysts formic acid hydrogen source in aqueous solution, providing an environmentally friendly methodology for the construction a wide range functionalized amine compounds excellent yields (≈ 80 %‐95 %). This effective can be scaled up to gram scale 0.1 mol‐% catalyst loading also employed synthesis medical substances such Meclizine.

Язык: Английский

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Effect of 1,1,1,3,3,3-Hexafluoroisopropanol (HFIP) on the ruthenium-catalyzed transfer hydrogenation of ketones

Journal of Catalysis, Год журнала: 2025, Номер 450, С. 116248 - 116248

Опубликована: Июнь 3, 2025

Язык: Английский

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