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NMR spectrometer for the online monitoring of chemical reactions of low-gamma-nuclei

English title NMR spectrometer for the online monitoring of chemical reactions of low-gamma-nuclei
Applicant Furrer Julien
Number 170755
Funding scheme R'EQUIP
Research institution Departement für Chemie und Biochemie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Inorganic Chemistry
Start/End 01.12.2016 - 30.11.2017
Approved amount 187'650.00
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All Disciplines (2)

Discipline
Inorganic Chemistry
Organic Chemistry

Keywords (5)

flow-chemistry; reaction monitoring; low gamma nuclei; NMR Spectroscopy; Inorganic chemistry

Lay Summary (French)

Lead
Dans ce projet, nous comptons utiliser le nouveau spectromètre RMN pour obtenir des renseignements structuraux précis dans plusieurs domaines de la chimie, en particulier ceux où des espèces dites transientes (à faible durée de vie) jouent un rôle important. Un exemple typique est la catalyse, c'est à dire l'utilisation d'une molécule qui participe indirectement pour booster une réaction chimique connue (améliorer le rendement, diminuer le temps de réaction, diminuer l'apport de substances nocives pour l'environnement).L'oxydation de l'eau (formation d'oxygene) est un processus très important qui nécessite l'apport de ces catalyseurs. Une bonne comprhöension des propriétés de ces catalyseurs est nécessaire pour améliorer le rendement de la réaction.
Lay summary

Plus spécifiquement nos objectifs sont, dans un premier temps, de travailler sur deux projets:

 (i)Etude de complexes metalliques (Ru, Pd) contenant des ligands pyridylideneamide. Ce type de complexes permet une efficience remarquable de l'oxydation de l'eau. Nous souhaitons mettre en lumière des changements structuraux subtils, en particulier des processus dits d'échange de ligands

(ii) Etude de complexes d'argent triaolylidene. Ces complexes sont de fantastiques catalyseurs pour cliver des liasions C-C de facon potentiellement catalytique. Ces liaisons C-C sont notamment très importantes dans les energies fossiles, le design rétrosynthétique (pour la synthèse de produits naturels) ou pour changer la strcuture d'acides gras.

Pour ce projet, nous envisageons une etude RMN du centre actif Argent (109Ag NMR). En etudieant le processus de clivage de la liaision C-C, nous serons en mesure d'identifier les espèces actives. De plus, nous pourrons déterminer si l'atome d'argent est lié ou non à un ligand triaolylidene. Ainsi, nous serons en mesure d'identifier les bases structurales pour créer de nouveaux catalyseurs d'argent permettant un clivage de liaisons C-C catalytique.

 



 

Direct link to Lay Summary Last update: 21.11.2016

Responsible applicant and co-applicants

Publications

Publication
Carbohydrate-Functionalized 1,2,3-Triazolylidene Complexes for Application in Base-Free Alcohol and Amine Oxidation
Pretorius René, Olguín Juan, Albrecht Martin (2017), Carbohydrate-Functionalized 1,2,3-Triazolylidene Complexes for Application in Base-Free Alcohol and Amine Oxidation, in Inorganic Chemistry, 56(20), 12410-12420.
Enhanced Catalytic Activity of Iridium(III) Complexes by Facile Modification of C,N-Bidentate Chelating Pyridylideneamide Ligands
Navarro Miquel, Smith Christene A., Albrecht Martin (2017), Enhanced Catalytic Activity of Iridium(III) Complexes by Facile Modification of C,N-Bidentate Chelating Pyridylideneamide Ligands, in Inorganic Chemistry, 56(19), 11688-11701.
Triazolylidene Iridium Complexes for Highly Efficient and Versatile Transfer Hydrogenation of C═O, C═N, and C═C Bonds and for Acceptorless Alcohol Oxidation
Mazloomi Zahra, Pretorius René, Pàmies Oscar, Albrecht Martin, Diéguez Montserrat (2017), Triazolylidene Iridium Complexes for Highly Efficient and Versatile Transfer Hydrogenation of C═O, C═N, and C═C Bonds and for Acceptorless Alcohol Oxidation, in Inorganic Chemistry, 56(18), 11282-11298.
Synthesis, hemilability, and catalytic transfer hydrogenation activity of iridium(III) and ruthenium(II) complexes containing oxygen-functionalised triazolylidene ligands
Pretorius René, Mazloomi Zahra, Albrecht Martin (2017), Synthesis, hemilability, and catalytic transfer hydrogenation activity of iridium(III) and ruthenium(II) complexes containing oxygen-functionalised triazolylidene ligands, in Journal of Organometallic Chemistry, 845, 196-205.
Influence of the Linker Length and Coordination Mode of (Di)Triazolylidene Ligands on the Structure and Catalytic Transfer Hydrogenation Activity of Iridium(III) Centers
Vivancos Ángela, Albrecht Martin (2017), Influence of the Linker Length and Coordination Mode of (Di)Triazolylidene Ligands on the Structure and Catalytic Transfer Hydrogenation Activity of Iridium(III) Centers, in Organometallics, 36(8), 1580-1590.
Triazolylidene Iron(II) Piano-Stool Complexes: Synthesis and Catalytic Hydrosilylation of Carbonyl Compounds
Johnson Chloe, Albrecht Martin (2017), Triazolylidene Iron(II) Piano-Stool Complexes: Synthesis and Catalytic Hydrosilylation of Carbonyl Compounds, in Organometallics, 36(15), 2902-2913.

Collaboration

Group / person Country
Types of collaboration
Prof. Macchioni / Univ Perugia Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Bernhard / Carnegie Mellon Univ United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Associated projects

Number Title Start Funding scheme
162868 Mesoionic ligands as versatile promoters for energy-relevant oxidation catalysis 01.12.2015 Project funding (Div. I-III)

Abstract

This proposal aims at obtaining financial support for the purchase of a 300 MHz NMR spectrometer equipped with a special module “InsightMR” devoted to perform continuous-flow NMR experiments and a special probehead to measure low-gamma nuclei such as 57Fe and 109Ag. This spectrometer will be installed in the laboratories of Prof. Dr. Martin Albrecht, managed by the group of the Department (PD. Dr. J Furrer) and will be freely accessible to any internal researcher that requires the use of this instrument for his/her research. This NMR spectrometer will be particularly well-suited for detailed investigations of the formation, reactivity, and catalytic properties of inorganic molecules and for obtaining structural information of complexes that contain nuclei such as 57Fe, 103Rh or 109Ag.Our current NMR facility is not equipped for measuring low-gamma nuclei. In addition, All NMR spectrometers (4) are currently overbooked and kinetic measurements are only conceivable in manual mode, in off-peak periods, require a lot of experimental time. Some of the measurements planned in this proposal are actually not conceivable using our current equipment.As such, for the investigators of this proposal, the requested equipment would open new fields to NMR spectroscopic research that are currently not feasible with the current equipment available. Owing to the broad variety of samples falling into the application field of this NMR spectrometer dedicated to measure low-gamma nuclei on one hand and continuous-flow NMR experiments on the other hand, it is expected that a diversified interdisciplinary usership will be able to benefit from this new equipment. In view of the current countrywide lack of accessibility to such a dedicated system within the Swiss university institutions, the equipment will close this gap and will enable us to keep up with modern state-of-the-art technologies, explore new applications fields and extend our competences.
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