High activity heterogeneous catalysts by plasma-enhanced chemical vapor deposition of volatile palladium complexes on biomorphic carbon
Publication date: Available online 10 May 2018 Source:Comptes Rendus Chimie Author(s): Lisa Czympiel, Michael Frank, Andreas Mettenbörger, Sven-Martin Hühne, Sanjay Mathur Six new palladium complexes based on allyl and alkenolate ligands were synthesized and structurally characterized. Combination of delocalized allylic sp2-hybridized carbon centers and a strongly binding NˆO chelating unit (e.g., 3,3,3-trifluoro(pyridin-2-yl)propen-2-ol) offered a promising combination of high volatility and thermal lability not commonly observed in noble metal precursors. Application of the new Pd compounds in thermal metal–o...
Source: Comptes Rendus Chimie - May 22, 2018 Category: Chemistry Source Type: research
Comparative assessment of the ability of a microwave absorber nanocatalyst in the microwave-assisted biodiesel production process
In this study, a carbon-supported KOH/Ca12Al14O33 nanocomposite was fabricated via the microwave combustion method, in which dextrose was used as a carbon source, and its activity in the microwave-assisted transesterification reaction as a microwave absorption material was assessed. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry, Brunauer–Emmett–Teller (BET), field-emission scanning electron microscopy, and energy dispersive X-ray analyses. The results showed that the carbonate and noncarbonate samples had a calcium aluminate (Ca12Al14O33) structure as a s...
Source: Comptes Rendus Chimie - May 22, 2018 Category: Chemistry Source Type: research
Challenges in chemical synthesis at the border of solution-based and solid-state chemistry —Synthesis and structure of [CH3CH2Ge9{Si(SiMe3)3}]2−
We present a synthetic method for a stepwise ligand exchange reaction at a Zintl ion. Herein, we functionalized the [Ge9{Si(SiMe3)3}2]2− cluster with an ethyl group by a reaction with bromoethane. The obtained anion [CH3CH2Ge9{Si(SiMe3)3}2]− was characterized by NMR spectroscopy and mass spectrometry. After addition of 2,2,2-crypt an abstraction of one silyl ligand was observed resulting in the crystallization of [K(2,2,2-crypt)]2[CH3CH2Ge9{Si(SiMe3)3}] representing the first monosilylated Ge9 Zintl cluster, which carries an additional ethyl group. The latter compound was characterized by single crystal X-ray crystallo...
Source: Comptes Rendus Chimie - May 22, 2018 Category: Chemistry Source Type: research
Green solvents from ionic liquids and deep eutectic solvents to natural deep eutectic solvents
This article contains a review of the applications of NADESs as extraction solvents, reaction media, and preservative, providing also a perspective of their future. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - May 22, 2018 Category: Chemistry Source Type: research
Macroscopic methods: Magnetic, optical, and calorimetric techniques
In this study, we will focus on the basis and the evolution of three critical macroscopic tools, i.e. the optical, magnetic, and calorimetric characterization methods. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - May 22, 2018 Category: Chemistry Source Type: research
