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Transition Metal Catalysis 2016
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Transition Metal Catalysis 2016

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Organometallic Chemistry".

Deadline for manuscript submissions: closed (20 October 2016) | Viewed by 11289

Special Issue Information

Dear Colleagues,

Transition metal catalysis represents the core of modern-day synthetic methodology, which is being extensively exploited in both laboratory and industrial settings. Its applications, which range from manufacturing ingredients for cosmetic products to generating bioactive molecules for drug discovery, stand as testimony to the critical roles a transition metal-catalyzed process plays in meeting our growing needs for efficient chemical technology. Discovery of such a catalytic process is often guided by aspirations for developing novel organic transformations and replacing existing, inefficient processes. In recent years, high throughput screenings and mechanism-guided reaction investigations, often augmented by theoretical calculations, have provided breeding grounds for the growth of new catalytic transformations. Moreover, mechanistic understanding, gleaned from the studies of known transition metal-catalyzed reactions, is also serving as a blueprint both for the rational design of improved catalysts aimed at developing catalysts with high turnover numbers (TON) and selectivity, and for the conception of novel organometallic catalysis tailored to solve specific problems in organic synthesis.

This Special Issue on Transition Metals Catalysis is anticipated to showcase representative state-of-the-art developments in all aspects of transition metal-catalyzed reactions. Therefore, contributions are invited in all themes, including, but not limited to, reaction discovery, mechanistic study, and catalyst design.

Dr. Ramesh Giri
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • organotransition metal complexes
  • catalyst design
  • homogeneous and Heterogeneous catalysis
  • cross‒coupling reactions
  • synthetic tools
  • selectivity
  • inter- and intramolecular reactions
  • sustainable Chemistry

Published Papers (2 papers)

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Research

5705 KiB  
Article
Catalytic Performance of a New 1D Cu(II) Coordination Polymer {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) for Knoevenagel Condensation
by Edurne S. Larrea, Roberto Fernández de Luis and María I. Arriortua
Molecules 2016, 21(12), 1651; https://doi.org/10.3390/molecules21121651 - 01 Dec 2016
Cited by 3 | Viewed by 4692
Abstract
The {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) (H2Tae = 1,1,2,2-tetraacetylethane, 4,4′-Bpy = 4,4′-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4′-Bpy)} zig-zag metal–organic chains stacked along the [100] crystallographic direction. Copper(II) ions [...] Read more.
The {Cu(NO3)(H2O)}(HTae)(4,4′-Bpy) (H2Tae = 1,1,2,2-tetraacetylethane, 4,4′-Bpy = 4,4′-Dipyridyl) 1D coordination polymer has been obtained by slow evaporation. The crystal structure consists of parallel and oblique {Cu(HTae)(4,4′-Bpy)} zig-zag metal–organic chains stacked along the [100] crystallographic direction. Copper(II) ions are in octahedral coordination environment linked to two nitrogen atoms of two bridging 4,4′-Bpy and to two oxygen atoms of one HTae molecule in the equatorial plane. The occupation of the axial positions varies from one copper atom to another, with different combinations of water molecules and nitrate anions, giving rise to a commensurate super-structure. By means of the thermal removal of water molecules, copper coordinatively unsaturated centres are obtained. These open metal sites could act as Lewis acid active sites in several heterogeneous catalytic reactions. The dehydrated compound, CuHTaeBpy_HT, has been tested as a heterogeneous recoverable catalyst for Knoevenagel condensation reactions. The catalyst is active and heterogeneous for the condensation of aldehydes with malononitrile at 60 °C using a molar ratio catalyst:substrate of 3 % and toluene as solvent. The catalyst suffers a partial loss of activity when reusing it, but can be reused at least four times. Full article
(This article belongs to the Special Issue Transition Metal Catalysis 2016)
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2310 KiB  
Article
Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts
by Xiaolan Zeng, Xiaoyue Huo, Tianle Zhu, Xiaowei Hong and Ye Sun
Molecules 2016, 21(11), 1491; https://doi.org/10.3390/molecules21111491 - 14 Nov 2016
Cited by 18 | Viewed by 6311
Abstract
A series of MnOx–CeO2 and MnOx–TiO2 catalysts were prepared by a homogeneous precipitation method and their catalytic activities for the NO oxidation in the absence or presence of SO2 were evaluated. Results show that the optimal [...] Read more.
A series of MnOx–CeO2 and MnOx–TiO2 catalysts were prepared by a homogeneous precipitation method and their catalytic activities for the NO oxidation in the absence or presence of SO2 were evaluated. Results show that the optimal molar ratio of Mn/Ce and Mn/Ti are 0.7 and 0.5, respectively. The MnOx–CeO2 catalyst exhibits higher catalytic activity and better resistance to SO2 poisoning than the MnOx–TiO2 catalyst. On the basis of Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and scanning transmission electron microscope with mapping (STEM-mapping) analyses, it is seen that the MnOx–CeO2 catalyst possesses higher BET surface area and better dispersion of MnOx over the catalyst than MnOx–TiO2 catalyst. X-ray photoelectron spectroscopy (XPS) measurements reveal that MnOx–CeO2 catalyst provides the abundance of Mn3+ and more surface adsorbed oxygen, and SO2 might be preferentially adsorbed to the surface of CeO2 to form sulfate species, which provides a protection of MnOx active sites from being poisoned. In contrast, MnOx active sites over the MnOx–TiO2 catalyst are easily and quickly sulfated, leading to rapid deactivation of the catalyst for NO oxidation. Furthermore, temperature programmed desorption with NO and O2 (NO + O2-TPD) and in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) characterizations results show that the MnOx–CeO2 catalyst displays much stronger ability to adsorb NOx than the MnOx–TiO2 catalyst, especially after SO2 poisoning. Full article
(This article belongs to the Special Issue Transition Metal Catalysis 2016)
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