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Kay Severin

Cette personne a quitté l’EPFL

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Publications associées (205)

Page 5 sur 11

Combining Metallasupramolecular Chemistry with Dynamic Covalent Chemistry: Synthesis of Large Molecular Cages

Rosario Scopelliti, Kay Severin, Anton Granzhan

Ru-built cube: By combining metallasupramolecular chemistry with dynamic covalent chemistry, complex nanostructures can be formed. Large cages are synthesized by reaction of trinuclear metallamacrocycles containing pendant aldehyde groups. ...

Wiley-VCH Verlag GmbH2010

Two-Step Synthesis of Linear and Bent Dicarboxylic Acid Metalloligands with Lengths of up to 3 nm

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Suzanne Maria Jansze, Ophélie Marie Planes

Nanometer-sized polycarboxylate ligands are interesting building blocks for metallasupramolecular chemistry, but access to these compounds is often limited by complicated synthetic pathways. Here, we describe a simple two-step protocol, which allows prepar ...

2020

Multifaceted Chemistry of [(Cymene)RuCl2]2 and PCy3

Rosario Scopelliti, Kay Severin, Euro Solari, Sébastien Gauthier

The reaction of (cymene)RuCl2 (1) with PCY3 was investigated using different stoichiometries and reaction conditions. Whereas a mixture of complex 1 and 2 equiv of PCy3 in methanol gave the known adduct [(cymene)Rucl(2)(PCy3)] (3) along with the phosp ...

American Chemical Society2009

Cp*Rh-Based Indicator Displacement Assays for the Identification of Amino Sugars and Aminoglycosides

Kay Severin, Andrey Buryak, Friederike Gundula Marie Zaubitzer

Indicator displacement assays based on the organometallic complex [Cp*RhCl2]2 and the dye gallocyanine have been used to sense aminosugars and aminoglycosides in buffered aqueous solution by UV-Vis spectroscopy. The data of three assays at pH 7.0, 8.0 and ...

2006

A bimetallic ruthenium ethylene complex as a catalyst precursor for the Kharasch reaction

Kay Severin, Euro Solari, Laurent Quebatte

A bimetallic complex, in which a RuCl2 (eta(2)C(2)H(4))(PCy3) fragment is connected via three chloro, bridges to a (eta(6)-p-cymene)RuCl2 fragment, has been synthesized and characterized by single-crystal X-ray crystallography. This complex was used to cat ...

2005

Synthesis of hyperbranched polyarylethenes by consecutive C–H vinylation reactions

Kay Severin, Albert Ruggi, Anastasia Gitlina

A novel procedure for the synthesis of polyarylethenes is described. Consecutive C–H vinylation reactions of tetraphenylethene with a triphenylethenyl triazene give hyperbranched polyarylethenes of variable sizes. The vinylation reactions are mediated by a ...

2023

Ruthenium Catalysts for the Kharasch Reaction

Kay Severin

Recent advances in the development of ruthenium catalysts for the atom transfer radical addn. of polyhalogenated compds. to olefins ('Kharasch reaction') are described. Three classes of homogeneous catalysts are discussed: halfsandwich complexes with h6-ar ...

2006

1-Alkynyltriazenes as Functional Analogues of Ynamides

Rosario Scopelliti, Kay Severin, Jérôme Waser, Gregor Kiefer, Loïc Nicolas Jeanbourquin, Sophie Lucie Racine, Daniele Perrotta, Florian Gérald Abela

The chemical reactivity of 1-alkynyltriazenes has been investigated and is found to parallel the reactivity of ynamides. The similarity in reactivity of these two classes of compounds is demonstrated by addition reactions with acids, by cycloaddition react ...

Wiley-Blackwell2015

A Micelle-Based Chemosensing Ensemble for the Fluorimetric Detection of Chloride in Water

Kay Severin

Caught in a trap! Fluorimetric chloride sensing in water is achieved by exploiting the changes in partition constant of a receptor complex in its bound and nonbound states. In the presence of chloride, the complex preferentially resides in the micelle pseu ...

2010

Sequential N–O and N–N Bond Cleavage of N-Heterocyclic Carbene-Activated Nitrous Oxide with a Vanadium Complex

Rosario Scopelliti, Kay Severin, Matthew Wodrich, Euro Solari, Alexander Tskhovrebov

Chemically induced bond cleavage of nitrous oxide typically proceeds by rupture of the N–O bond with concomitant O-atom transfer and liberation of dinitrogen. On a few occasions, N–N bond scission has been observed instead. We report a reaction sequence in ...

2012

Boronate Ester-Capped Helicates

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Daniel Ortiz Trujillo, Erica Giraldi

Triple‐stranded helicates were obtained by metal‐templated multicomponent reactions of bispyridyloxime ligands with arylboronic acids. The helicates feature two hexa‐coordinated MII ions (M=Fe, Zn, or Mn), which are embedded in a macrobicyclic ligand frame ...

2020

Triazene-Activated Donor–Acceptor Cyclopropanes: Ring-Opening and (3 + 2) Annulation Reactions

Rosario Scopelliti, Kay Severin, Jérôme Waser, Farzaneh Fadaei Tirani, Abdusalom Suleymanov, Zhaowen Dong, Eliott Hugo Joran Le Du, Bastian Antoine Rodolphe Claude Muriel

Donor–acceptor cyclopropanes substituted with 3,3-dialkyltriazenyl groups are described herein. The strong electron-donating character of the triazene renders the cyclopropanes highly reactive, allowing for catalyst-free ring-opening reactions with methano ...

2020

Gold-Catalyzed Synthesis of 1,3-Diaminopyrazoles from 1-Alkynyltriazenes and Imines

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Loïc Nicolas Jeanbourquin

A new procedure for the synthesis of highly substituted 1,3-diaminopyrazoles is described. As substrates, we have employed 1-alkynyltriazenes and imines. The formation of pyrazoles was achieved by two-fold C–N coupling reactions in the presence of (JohnPho ...

2017

Porous networks based on iron(ii) clathrochelate complexes

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, José Luis Bila, Emilie Baudat, Andrea Luca Ramorini

Microporous networks based on boronate ester-capped iron(II) clathrochelate complexes are described. The networks were obtained by covalent cross-linking of tetrabrominated clathrochelate complexes via Suzuki–Miyaura polycross-coupling reactions with dibor ...

2019

Olefin Cyclopropanation by a Sequential Atom-Transfer Radical Addition and Dechlorination in the Presence of a Ruthenium Catalyst

Rosario Scopelliti, Kay Severin, Gregor Kiefer, Katrin Anne Thommes

Wiley-VCH Verlag GmbH2009

Activation of Nitrous Oxide by Dinuclear Ruthenium Complexes

Rosario Scopelliti, Kay Severin, Euro Solari, Alexander Tskhovrebov

The dinuclear Ru(II) complexes (arene)Ru(μ-Cl)3RuCl(C2H4)(PCy3) (arene = p-cymene or 1,3,5-C6H3iPr3) react with N2O under mild conditions to give OPCy3 and the trinuclear complexes (arene)Ru(μ-Cl)3Ru(μ-Cl)3Ru(arene). The N-heterocyclic carbene complex (p-c ...

American Chemical Society2012

Tuning the π‐Accepting Properties of Mesoionic Carbenes: A Combined Computational and Experimental Study

Rosario Scopelliti, Kay Severin, Anne-Clémence Corminboeuf, Farzaneh Fadaei Tirani, Andrzej Sienkiewicz, Zhaowen Dong, Jacob Terence Blaskovits

Mesoionic imidazolylidenes are recognized as excellent electron-donating ligands in organometallic and main group chemistry. However, these carbene ligands typically show poor π-accepting properties. We have performed a computational analysis of 71 mesoion ...

2021

Molecularly Defined Nanostructures Based on a Novel AAA-DDD Triple Hydrogen Bonding Motif

Kay Severin, Konstantin Zhurov, Marcus Papmeyer

A facile and flexible method for the synthesis of a new AAA–DDD triple hydrogen-bonding motif is described. Polytopic supramolecular building blocks with precisely oriented AAA and DDD groups are thus accessible in few steps. These building blocks were use ...

Wiley-VCH Verlag GmbH2016

Importance of the p-Ligand: Remarkable Effect of the Cyclopentadienyl Ring on the Cytotoxicity of Ruthenium PTA Compounds

Paul Joseph Dyson, Rosario Scopelliti, Kay Severin, Barnali Dutta, Claudine Scolaro

The water-sol. complexes [(Cp'OR)RuCl(PTA)2] (Cp'OR = h5-1-alkoxy-2,4-di-tert-butyl-3-neopentylcyclopentadienyl; R = Me, Et; PTA = 1,3,5-triaza-7-phosphaadamantane) are considerably more cytotoxic (.apprx.2 orders of magnitude) than the cyclopentadienyl an ...

2008

Dinuclear Ruthenium Ethylene Complexes: Syntheses, Structures, and Catalytic Applications in ATRA and ATRC Reactions

Rosario Scopelliti, Kay Severin, Katrin Anne Thommes

2008