نتایج جستجو برای: ruthenium

تعداد نتایج: 8195  

2007
Chia-Yuan Chen Shi-Jhang Wu Jheng-Ying Li Chun-Guey Wu Jian-Ging Chen Kuo-Chuan Ho

Dye-sensitized solar cells (DSCs) have been explored for more than a decade for realistic photovoltaic applications owing to their high conversion efficiency and low cost. Molecular engineering of the sensitizers to achieve high photovoltaic performance and long-term device stability is one of the critical strategies. Since the first high-efficiency ruthenium-based sensitizer, cis-di(thiocyanat...

Journal: :Physical chemistry chemical physics : PCCP 2014
Jonathan Z Bloh Ralf Dillert Detlef W Bahnemann

We recently reported a highly active photocatalyst, ruthenium-modified zinc oxide, which was found to be able to utilise the red part of the visible light spectrum for photocatalytic reactions [Bloh et al., Environ. Sci. Pollut. Res., 2012, 19, 3688-3695]. However, the origin and mechanism of the observed activity as well as the nature of the photoactive centres are still unknown. Herein, we ex...

Journal: :Chemical communications 2016
Richard L Wingad Emilie J E Bergström Matthew Everett Katy J Pellow Duncan F Wass

Catalysts based on ruthenium diphosphine complexes convert methanol/ethanol mixtures to the advanced biofuel isobutanol, with extremely high selectivity (>99%) at good (>75%) conversion via a Guerbet-type mechanism.

Journal: :Chemical & pharmaceutical bulletin 2003
Takahiro Kawai Takashi Ooi Takenori Kusumi

Oxidation products of cyclopropanoid terpenes, (-)-carane (4), (+)-cyclosativene (5), laurinterol methyl ether (6), and thujopsane (7), with ruthenium tetraoxide were investigated.

2017
L. McCafferty C. O'Rourke A. Mills A. Kafizas I. P. Parkin J. A. Darr

Ultrafine ruthenium–titanium oxide catalysts were directly produced using a continuous hydrothermal flow synthesis process and assessed as chloride oxidation catalysts. Selectivity towards chlorine (over oxygen) evolution was shown to generally increase with decreasing ruthenium content. The optimum catalyst was then used to make an anode for a light-driven brine-splitting demonstrator device t...

Journal: :Chemical communications 2010
Mehmet Zahmakiran Yalcin Tonbul Saim Ozkar

The preparation of ruthenium(0) nanoclusters supported on hydroxyapatite and their characterization by a combination of complementary techniques are described. The resultant ruthenium(0) nanoclusters provide high activity and reusability in the complete hydrogenation of aromatics under mild conditions (at 25 degrees C and with 42 psi initial H(2) pressure).

Journal: :The Journal of organic chemistry 2016
Tengfei Li Hao Yan Xincheng Li Chunxiang Wang Boshun Wan

A ruthenium-catalyzed intermolecular [3 + 2] cycloaddition of 2H-azirines and activated alkynes is reported, which provides polysubstituted pyrroles in moderate to good yields. This approach features a C-N bond cleavage of 2H-azirines by a ruthenium catalyst. The results of this study would provide a complementary method to synthesize polysubstituted pyrroles from the known 2H-azirine approache...

Journal: :Angewandte Chemie 2021

Tailored ruthenium sandwich complexes bearing photoresponsive arene ligands can efficiently promote azide–thioalkyne cycloaddition (RuAtAC) when irradiated with UV light. The reactions be performed in a bioorthogonal manner aqueous mixtures containing biological components. strategy also applied for the selective modification of biopolymers, such as DNA or peptides. Importantly, this ruthenium-...

Journal: :Catalysts 2023

Ruthenium complexes are remarkable catalysts for the C–H activation approaches and organic transformations. Combining a Ru-catalyst with oxidants other additives in one-pot process is considered sustainable approach due to reduction reaction steps minimal usage of solvents during synthesis, work-up, isolation chemicals, purification products. This review highlights ruthenium-catalyzed transform...

In this study fullerene functionalized using oleum (H2SO4·SO3), followed by the hydrolysis of the intermediate cyclosulfated fullerene as well as  an oxidizing agent was employed to functionalize the fullerenes. Ruthenium was then added by the impregnation method or deposited on the functionalized fullerene. Subsequent to this step, Response Surface Methodol...

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