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Kay Severin

Cette personne a quitté l’EPFL

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Publications associées (205)

Page 4 sur 11

Atom-Transfer Radical Addition Reactions Catalyzed by RuCp* Complexes: A Mechanistic Study

Kay Severin, Andrzej Sienkiewicz, Katarzyna Pierzchala, Gregor Kiefer, Katrin Anne Thommes

Kinetic and spectroscopic analyses were performed to gain information about the mechanism of atom-transfer radical reactions catalyzed by the complexes [RuCl2Cp*(PPh3)] and [RuClCp*(PPh3)2] (Cp*=pentamethylcyclopentadienyl), in the presence and in the abse ...

2009

Ruthenium-catalyzed Atom Transfer Radical Addition Reactions

Kay Severin

Certain ruthenium complexes are potent catalysts for atom transfer radical addition (ATRA) and cyclization (ATRC) reactions, in particular if they are used in conjunction with reducing agents such as magnesium. This short overview summarizes recent develop ...

2012

Ligand Effects in Low-Valent Co(I) Clathrochelate Complexes

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Ophélie Marie Planes

Clathrochelate complexes of cobalt are known in the oxidation states I, II, and III. Low-valent Co(I) complexes are highly reactive compounds, and there is only limited knowledge about their structures in the solid state. Herein, we describe the crystallog ...

2021

Crystal Engineering of Polymeric Structures with Dative Boron–Nitrogen Bonds: Design Criteria and Limitations

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Philip Pattison, Kurt Schenk, Euro Solari, Nicolas Luisier

The combination of tripyridyl ligands and linear diboronate esters results in the formation of oligomeric or polymeric adducts featuring dative boron−nitrogen bonds. The relative orientation of the two different building blocks in the assemblies can be pre ...

2016

Nanogels with Metal‐Organic Cages as Functional Crosslinks

Kay Severin, Chaolei Hu

A dinuclear metal-organic cage with four acrylate side chains was prepared by self-assembly. Precipitation polymerization of the cage with N-isopropylacrylamide yielded a thermoresponsive nanogel. The host properties of the cage were retained within the ge ...

Wiley-VCH Verlag GmbH2024

Cages vs. Prisms: Controlling the Formation of Metallosupramolecular Architectures with Ligand Side-Chains

Andrea Luca Ramorini, Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Giacomo Cecot, Ophélie Marie Planes

Metallosupramolecular assemblies of the general formula M2nLn can adopt prismatic or cage‐like structures. The factors controlling the aggregation number n and the geometry of the final assembly are still not fully understood. Here, we describe the synthes ...

2019

Dinuclear clathrochelate complexes with pendent cyano groups as metalloligands

Rosario Scopelliti, Kay Severin, Henrik Moodysson Rønnow, Philip Pattison, Ivica Zivkovic, Bálint Náfrádi, Euro Solari, Giacomo Cecot, Mathieu Jérémie Marmier, José Luis Bila

Dinuclear clathrochelate complexes with two, three, four, or five cyano groups in the ligand periphery were prepared following two distinct synthetic strategies: (a) zinc(II)- or cobalt(II)-templated polycondensation reactions of CN-functionalized arylboro ...

2016

A four-component organogel based on orthogonal chemical interactions

Kay Severin, Kurt Schenk, Nicolas Luisier

A thermoresponsive organogel was obtained by orthogonal assembly of four compounds using dynamic covalent boronate ester and imine bonds, as well as dative boron-nitrogen bonds. It is shown that the gel state can be disrupted or reinforced by chemicals whi ...

Royal Society of Chemistry2014

Transferring the Concept of Multinuclearity to Ruthenium Complexes for Improvement of Anticancer Activity

Kay Severin, Alexey Nazarov, Michael Groessl, Christian Hartinger

Multinuclear platinum anticancer complexes are a proven option to overcome resistance of established anticancer compounds. Transferring this concept to ruthenium complexes led to the synthesis of dinuclear Ru(II)-arene compounds containing a bis(pyridinone ...

2009

Fixation of nitrous oxide by mesoionic and carbanionic N-heterocyclic carbenes

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Euro Solari, Léonard Yannick Maurice Eymann, Giacomo Cecot

A ditopic carbanionic N-heterocyclic carbene was found to react with the inert gas nitrous oxide, resulting in a stable covalent adduct with two intact N2O groups attached to the heterocycle. Mesoionic N-heterocyclic carbenes derived from C2-arylated 1,3-b ...

Royal Society of Chemistry2017

Orientational Self-Sorting in Octahedral Palladium Cages: Scope and Limitations of the “cis Rule”

Kay Severin, Farzaneh Fadaei Tirani, Damien Wen Chen, Jean Charles Edouard de Montmollin, Atena-Bianca Solea

Octahedral coordination cages of the general formula Pd6L1212 were obtained by combining Pd(CH3CN)42 with heteroditopic N-donor ligands. Four different ligands were employed. These ligands have 3-pyridyl donor groups at one end and 4-pyridyl, ...

2024

Reactions of Alkynes with [RuCl(cyclopentadienyl)] Complexes: The Important First Steps

Rosario Scopelliti, Kay Severin, Ursula Röthlisberger, Euro Solari, Basile Curchod, Pablo Campomanes Ramos, Barnali Dutta

Cyclopentadienyl-ruthenium half-sandwich complexes with 2-bound alkyne ligands have been suggested as catalytic intermediates in the early stages of Ru-catalyzed reactions with alkynes. We show that electronically unsaturated complexes of the formula [RuCl ...

2010

Controlled Formation of Mixed-Metal Macrocycles Using Dynamic Exchange Processes and Steric Constraints

Rosario Scopelliti, Kay Severin, Zacharias Immanuel Grote

The exchange reaction of the trinuclear macrocycles [(C6H3iPr3)Ru(C5H3NO2)]3 (AAA) and [(cymene)Ru(C5H3NO2)]3 (BBB) has been studied. It was found that the equilibration proceeds in two steps and that the final mixture is completely dominated by the mixed- ...

2007

Orientational self-sorting in cuboctahedral Pd cages

Kay Severin, Farzaneh Fadaei Tirani, Adam Wade Marcus

Cuboctahedral coordination cages of the general formula [Pd12L24]24+ (L = low-symmetry ligand) were analyzed theoretically and experimentally. With 350 696 potential isomers, the structural space of these assemblies is vast. Orientational self-sorting refe ...

2022

Bronsted and Lewis acid adducts of triazenes

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Abdusalom Suleymanov, Iris Roswitha Landman, Frederick Mark Chadwick

The synthetic utility of triazenes rests on the fact that the triazene function can be cleaved by BrOnsted or Lewis acids, liberating diazonium compounds. However, the preferred coordination site of the acid is still a matter of debate. We have analyzed tr ...

2020

Formation of a Ruthenium mu-Carbide Complex with Acetylene as the Carbon Source

Rosario Scopelliti, Kay Severin, Euro Solari, Sébastien Gauthier

Reactions of the dinuclear ruthenium complex [(p-cymene)Ru(mu-Cl)3RuCl(C2H4)(PCy3)] with phenylacetylene or tert-butylacetylene gave the vinylidene complexes [(p-cymene)Ru(mu-Cl)3RuCl(=C=CHR)(PCy3)] (R = tBu, Ph), which were characterized crystallographica ...

2007

Borophosphonate Cages: Easily Accessible and Constitutionally Dynamic Heterocubane Scaffolds

Rosario Scopelliti, Kay Severin, Laure Menin, Konstantin Zhurov, Justus Tönnemann

A versatile and experimentally facile procedure for the synthesis of borophosphonate cages of the general formula [tBuPO3BR′]4 is described. The method involves heating of tert-butylphosphonic acid with a boronic acid in toluene to give borophosphonates in ...

Wiley-V C H Verlag Gmbh2012

Fluorescence Sensors for Lithium Ions and Small Peptides

Kay Severin, Sébastien Rochat

Simple but powerful chemosensors were developed by taking advantage of self-assembly processes. First, we will describe a turn-on fluorescent sensor for the pharmacologically important lithium ion. The sensor can be used in purely aqueous solution, and it ...

Schweizerische Chemische Gesellschaft2010

Supramolecular gels based on boronate esters and imidazolyl donors

Rosario Scopelliti, Kay Severin, Nicolas Luisier

Dative boron–nitrogen bonds can be used for the controlled assembly of boronate esters and N-donor ligands. So far, most investigations have focused on crystalline assemblies. In contrast, there are very few reports about soft materials based on dative B–N ...

2016

Self-Assembly of Arylboronate Esters with Pyridyl Side Chains

Rosario Scopelliti, Kay Severin, Erin Sheepwash, Kai Zhou

Boronate esters that contain N-donor groups are self-complementary structures, which can assemble by means of dative boron–nitrogen bonds to form macrocycles or polymers. Herein, we describe the synthesis of dioxaborinanes and benzodioxaboroles containing ...

Wiley-Blackwell2013