Yuanyuan Min;Faqiang Leng;Bruno F. Machado;Pierre Lecante;Pierre Roblin;Hervé Martinez;Thomas Theussl;Alberto Casu;Andrea Falqui;María Barcenilla;Silverio Coco;Beatriz María Illescas Martínez;Nazario Martin;M. Rosa Axet;Philippe Serp; 《欧洲无机化学杂志》2020,2020(43):4069-4082

The bottom-up covalent assembly of metallic nanoparticles (NP) represents one of the innovative tools in nanotechnology to build functional heterostructures, with the resulting assemblies showing superior collective properties over the individual NP for a broad range of applications. The ability to control the dimensionality of the assembly is one of the major challenges in designing and understanding these advanced materials. Here, two new organic linkers were used as building blocks in order to guide the organization of Ru NP into two- or three-dimensional covalent assemblies. The use of a hexa-adduct functionalized C60 leads to the formation of 3D networks of 2.2 nm Ru NP presenting an interparticle distance of 3.0 nm, and the use of a planar carboxylic acid triphenylene derivative allows the synthesis of 2D networks of 1.9 nm Ru NP with an interparticle distance of 3.1 nm. The Ru NP networks were found to be active catalysts for the selective hydrogenation of phenylacetylene, reaching good selectivity toward styrene. Overall, we demonstrated that catalyst performances are significantly affected by the dimensionality (2D vs. 3D) of the heterostructures, which can be rationalize based on confinement effects.  相似文献   

    

Clément Larquet;Yannick Klein;David Hrabovsky;Andrea Gauzzi;Clément Sanchez;Sophie Carenco; 《欧洲无机化学杂志》2019,2019(6):762-765

Nanoparticles with strong paramagnetic responses are of prime interest for advanced MRI imaging. To replace expensive and toxic Gd complexes, Gd-based nanoparticles have emerged as a viable solution for efficient and harmless MRI contrast agents. Gadolinium oxysulfide nanoparticles could represent suitable candidates for MRI imaging and bimodal imaging thanks to their excellent properties as host matrix and chemical stability, but their magnetic properties at the nanoscale have been hitherto poorly investigated especially in the case of ultrafine nanoparticles (< 10 nm), where surface effects and ligands can significantly affect the magnetic behavior. In the present work, we synthesized and characterized bimetallic (Gd,Ce)2O2S nanoparticles and demonstrated that they are paramagnetic over a wide temperature range including the body one. The mixture of Gd and Ce magnetic centers enables a fine control of the magnetic properties up to high Ce concentrations (80 %) and over a large range of magnetic moments, while photoemission properties are guaranteed up to 20 % of Ce owing to a regular dispersion of the Ce centers. The present study on bimetallic oxysulfide nanoparticles with high concentrations of two lanthanides shows that (Gd,Ce)2O2S nanoparticles are viable candidates as tunable nanoscale agents for bimodal imaging.  相似文献   

    

Francesca Bettazzi;Diego Voccia;Andrea Bencini;Claudia Giorgi;Ilaria Palchetti;Barbara Valtancoli;Luca Conti; 《欧洲无机化学杂志》2018,2018(23):2675-2679

A variety of transition metal organometallic and coordination receptor systems that can recognize and sense anionic guest species in organic and aqueous media by electrochemical and optical methods have already been reported in literature. In many cases, a redox-active/photo-active transition metal reporter group is used. Here, we describe two novel molecules consisting of a polyaza receptor unit for anion coordination and an acridine moiety as signal generating unit for anion sensing. The optical and electrochemical behavior of the two compounds was investigated in order to define novel detection schemes. In this regard, selenium anionic species selenite (SeO32–) and selenate (SeO42–) were chosen as model system.  相似文献   

    

Xiaoqing Zeng  Andrea Flores&#x;Antognini  Helmut Beckers  Helge Willner 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(9):2797-2800

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Kristin Schacht  Tomasz Jüngst  Matthias Schweinlin  Andrea Ewald  Jürgen Groll  Thomas Scheibel 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(9):2858-2862

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Marcel Kwiatkowski  Marcus Wurlitzer  Maryam Omidi  Ling Ren  Sebastian Kruber  Refat Nimer  Wesley D. Robertson  Andrea Horst  R. J. Dwayne Miller  Hartmut Schlüter 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(1):287-290

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Dipl.‐Ing. Tobias Wombacher  Dr. Andrea Gassmann  Sabine Foro  Prof. Heinz von Seggern  Prof. Dr. Jörg J. Schneider 《Angewandte Chemie (International ed. in English)》2016,55(20):6041-6046

The molecular structure of the hydrocarbon 5,6;11,12‐di‐o‐phenylenetetracene (DOPT), its material characterization and evaluation of electronic properties is reported for the first time. A single‐crystal X‐ray study reveals two different motifs of intramolecular overlap with herringbone‐type arrangement displaying either face‐to‐edge or co‐facial face‐to‐face packing depicting intensive π–π interactions. Density functional theory (DFT) calculations underpin that a favorable electronic transport mechanism occurs by a charge hopping process due to a π‐bond overlap in the DOPT polymorph with co‐facial arene orientation. The performance of polycrystalline DOPT films as active organic semiconducting layer in a state‐of‐the‐art organic field effect transistor (OFET) device was evaluated and proves to be film thickness dependent. For 40 nm layer thickness it displays a saturation hole mobility (μ_hole) of up to 0.01 cm² V^?1 s^?1 and an on/off‐ratio (I_on/I_off) of 1.5×10³.  相似文献   

    

Josephin M. Holstein  Lea Anhäuser  Prof. Dr. Andrea Rentmeister 《Angewandte Chemie (International ed. in English)》2016,55(36):10899-10903

The 5′‐cap is a hallmark of eukaryotic mRNAs and plays fundamental roles in RNA metabolism, ranging from quality control to export and translation. Modifying the 5′‐cap may thus enable modulation of the underlying processes and investigation or tuning of several biological functions. A straightforward approach is presented for the efficient production of a range of N7‐modified caps based on the highly promiscuous methyltransferase Ecm1. We show that these, as well as N²‐modified 5′‐caps, can be used to tune translation of the respective mRNAs both in vitro and in cells. Appropriate modifications allow subsequent bioorthogonal chemistry, as demonstrated by intracellular live‐cell labeling of a target mRNA. The efficient and versatile N7 manipulation of the mRNA cap makes mRNAs amenable to both modulation of their biological function and intracellular labeling, and represents a valuable addition to the chemical biology toolbox.  相似文献   

    

Camilla Matassini;Marco Bonanni;Marco Marradi;Stefano Cicchi;Andrea Goti; 《欧洲无机化学杂志》2020,2020(11-12):1106-1113

Indium(0)-mediated reductions have been reported for the transformation of several functional groups (imines, oximes, nitro groups, isoxazolidines, and conjugated alkenes, among others), prompted by the opportunity of performing the reactions in aqueous media and green conditions. We describe here the comparison of several reactions using indium or the less expensive zinc, carried out in order to evaluate the effective advantages brought about indium metal. We found some reactions for which use of In is mandatory and others where Zn worked equally well or even better. The reduction of hydroxylamines to the corresponding amines was the only reduction for which use of In provided much better results than Zn and was also possible to apply an efficient catalytic version with use of 2–5 mol-% In in the presence of stoichiometric Zn. Applicability of this catalytic reduction to “one-pot” model processes is also demonstrated.  相似文献   

    

Andrea Temperini  Raffaella Terlizzi  Lorenzo Testaferri  Marcello Tiecco 《合成通讯》2013,43(2):295-302

Aliphatic and aromatic amines are efficiently acylated by acetic, pivalic, benzoic, phthalic, or maleic anhydrides in ethyl acetate at room temperature. Under the same experimental conditions, amino alcohols are chemoselectively acylated at the amino group.  相似文献