Curriculum vitae de Aude Demessence

Aude Demessence

Chercheur

445 322 (Standard + 33 [0] 472 445 300)
P1409

Hybrid Materials, Functionalized Nanoparticles, Atomically Well-Defined Gold Clusters, Porous Metal-Organic Frameworks, Luminescent Gold Thiolate Coordination Polymers, Phase Transition

Formation Parcours Recherche Expertise Enseignement Publications

Education and professional experiences

2016 French diploma to conduct researches (HDR), “Structural and functional diversities in hybrid materials based on Gold Thiolates”, Lyon 1 University, France.

From 2010 CNRS Researcher, Institute of Researches on Catalysis and Environment of Lyon (IRCELYON), Lyon 1 University, France.

2008 – 2010 Postdoctoral Associate (Advisors: Dr. Christian SERRE and Dr. Clément SANCHEZ), Institute Lavoisier of Versailles, Versailles University and Collège de France, Sorbonne University, Paris, France. Grants from C’Nano and Macademia European Project. “Nanoparticles and Thin Films of Porous Metal-Organic Frameworks (MOFs)”.

2006 – 2008 Postdoctoral Associate (Advisor: Pr. Jeffrey R. LONG), University of California, Berkeley, USA. Grants from General Motors and Berkeley University. “New MOFs for Hydrogen Storage, Carbon Dioxide Capture and Selective Gas-Adsorption”.

2003 – 2006 PhD in Materials Chemistry, “Multifunctional Hybrid Materials: Elaboration of Lamellar Transition Metal Hydroxides and Study of their Luminescent and Magnetic Properties”, PhD Supervisor: Dr. Pierre RABU, Institute of Physics and Chemistry of Materials of Strasbourg (IPCMS), Strasbourg University, France. Involved in the European Network of Excellence MAGMANet.

2003 Master 2 degree in Transition Metals Chemistry and Molecular Engineering (Supervisor: Dr. Pierre BRAUNSTEIN), Strasbourg University, France.

Awards

2018-2021: CNRS Excellence Scientific Award in chemistry from the CNRS (PEDR).

Selected by Chemical Communication journal as among the international Emerging Investigators 2016 (Chem Commun., 2016, 52, 8897).

Fellowships

2015 Visiting Researcher (3 months) at the Indian Institute of Technology of Bombay (IITB), Mumbai, India, host: Pr. Ramaswamy MURUGAVEL. Fellowships: iMUST labex and IITB.

2014 Laureate for a short-term grant from the Japan Society for Promotion of Science (JSPS) (2 months), host: Pr. Susumu KITAGAWA, Kyoto University, Japan.

2002 Erasmus fellowship (4 months). Department of Inorganic Chemistry (Supervisor: Pr. Miguel JULVE OLCINA), Valencia University, Spain.

Awarded Research Support

2019 Laureate of an EMERGENCE project in 2019 from CNRS (1 year postdoc + 15 k€).

2019 Laureate for a postdoc grant from Fondation de la Maison de la Chimie.

2017 PI of a young researcher grant from Institute of Chemistry of Lyon (7.5 k€).

2017 Project leader for access to the ESRF synchrotron beamline.

2016 – 2020 PI of a France (ANR)/Japan (JST) project on Molecular Technology (250 k€).

2016 – 2019 Laureate for a PhD student funding from Rhône-Alpes region.

2016 Project leader for access to the SOLEIL synchrotron beamline.

2013 – 2017 PI of an ANR project for young researchers (180 k€).

2013 PI of a young researcher grant from Institute of Chemistry of Lyon (10 k€).

Organisation of scientific meetings

2018 Member of the national scientific committee of the international Gold 2018 conference, July 15-18, 2018, Paris, France.

2018 Member of the local organization committee of the national conference of the French Association of Crystallography (AFC 2018), July 10-13, 2018, Lyon, France.

2015 Member of the local organization committee of the national meeting on Molecular and Coordination Chemistry (GECOM-CONCOORD), May 26-29, 2015, Lyon, France.

2006 Member of the local organization committee of the first day of communications of the PhD students from Strasbourg University, May 4, 2006, Strasbourg, France.

Institutional responsabilities

From 2016 Secretary-elect of the Council of the Institute of IRCELYON, France.

2015 – 2016 Member-elect of the Council of the Institute of IRCELYON, France.

2011 – 2014 Responsible of the scientific animation at the IRCELYON, France

2007 – 2008 In charge of the X-Ray crystallography single crystal beamline at the Advanced Light Source at Lawrence Berkeley National Lab for the department of Chemistry.

2004 – 2006 President of the Young Chemists Club, Alsace section, of the French Chemistry Society.

2004 – 2006 Representative of the non-permanent staff at the Council of the Institute of IPCMS, France.

Aude Demessence is a CNRS researcher working at the Institute of Catalysis and Environment of Lyon at University of Lyon, France. She obtained her phD in 2006 from University of Strasbourg, France, on magnetic and luminescent hybrid materials under the supervision of Dr. P. Rabu. Then, she spent two years at Berkeley University, USA, in the group of Pr. J. R. Long as a first postdoctoral fellow, where she started to work on porous and flexible Metal-Organic Frameworks for gas adsorption. Her second postdoctoral position was done jointly at Versailles and Paris Universities with Dr. C. Serre and Dr. C. Sanchez to elaborate thin films of MOFs. From her recruitment by CNRS in 2010, Aude is developing her research on self-assembly of gold nanoparticles for catalysis thanks to a young researcher grant (ANR JCJC) and also on Metal-Organic Chalcogenolate coordination polymers for their photoluminescence (ANR/JST on Molecular Technology). She obtained a JSPS short term fellow in 2014 and spent two months in Pr. S. Kitagawa lab. She also visited for 3 months, in 2015, the Department of Chemistry led by Pr. R. Murugavel at IIT-Bombai, India.

The research mainly focuses on the synthesis and characterizations of gold and silver thiolate hybrid materials for heterogeneous catalysis and physical properties. The goal is to develop in parallel gold and silver thiolate coordination polymers, oligomers and atomically well-defined clusters in order to link the molecular chemistry and the nanoscience involved in these derivates and understand the formation and structure of functionalized nanoparticles in general and their assembly.

Figure 1 - General outline of our research program. We explore the possibility of designing tridimensional functional hybrid materials from coupling the nanoscience of atomically well-defined building-blocks and the molecular chemistry of self-assembled coordination polymers. The goals are to develop new catalysts, novel structures of photoluminescent materials and understand the formation of functionalized nanoparticles and their assembly.

Self-assembly of nanoparticles through organic linkers

Supported by the ANR JCJC (2013-2017)

Coll. Dr. Jean-François Nierengarten and Dr. Uwe Hahn (ECPM, University of Strasbourg, France).

Development of new catalysts to improve industrially important chemical reactions in terms of activity and selectivity, in environmentally more acceptable means and economical matter is one of the most important needs in research. Heterogeneous catalysis has shown its potential over the last years with the discovery of new catalysts easy to separate from the reaction medium. Today, nanoparticles are considered as the most exciting materials in heterogeneous catalysis due to their high surface/volume ratio allowing for a high numbers of catalytically active sites. Nevertheless, the main problem associated with the use of nanoparticles-based catalysts is their dispersion. When particles form stable colloidal solution, they show good activity and dispersion, but once exhausted, they are difficult to regenerate. In contrast, when nanoparticles are immobilized on a support they are easier to regenerate and still remain in a dispersed state, but these composites exhibit a lower accessible surface area, due to the support, that thus limits their inherent effectivity and in general the support effect is not negligible.

To overcome these limitations, we develop new nanostructured materials by using the concept of self-assembly of nanoparticles directed by organic linkers to generate multifunctional hybrid materials with a high number of catalytic centers. To connect gold nanoparticles and prevent their aggregation, we use voluminous linkers, such as the functionalized hexa-adduct fullerenes as 3D rigid and defined nodes.

Figure 2 - Schemes of the connection of gold nanoparticles through hexaadduct fullerenes with the associated cover publised in Chemical Communication journal.

Atomically well-defined gold nanoclusters as catalysts for oxidation reactions

Gold nanoparticles exhibit a catalytic activity in many chemical processes. Most of the reactions are size-dependant, i. e. the specific activity depends on the average gold particle size. Generally, the activity increases when the particle size decreases, with a marked increase below 5 nm. But for sub-2 nm particles, the origin of the catalytic power is still unclear and under intense debate. Fundamental investigations on the structure-catalytic activity relationships still lag behind, partly due to the polydispersity issue of gold nanoparticles which precludes the in-depth understanding of the origin of this size dependence.

Recently, atomically well-defined thiolate-capped Au nanoclusters (denoted as Au_n(SR)_m) have been successfully isolated and these monodispersed functionalized clusters, with gold core between 1-2 nm, hold promises as a new generation of catalysts. More importantly, these nanoclusters permit in-depth studies on the subtle correlation of structure and catalytic activity, since they are atomically and crystallographically well-defined.

To investigate the influence of the size, the type of ligands at the surface and also the support effect, we are working with different functionalized nanoclusters and various supports. Catalytic activity for the oxidation of alkene and alcohol derivatives of these colloidal or supported clusters are investigated. Depending on the aerobic oxidation reactions the presence of the surrounded thiolate ligands can improve the activity and selectivity of the catalyst or prevent the reaction and need to be removed to get activity.

Figure 3 - Aerobic oxidation reactions catalyzed by atomically well-defined thiolate gold clusters supported on silica.

Highly luminescent Au(I) thiolate coordination polymers

Coll. Dr. Nathalie Guillou (Institut Lavoisier de Versailles, University of Versailles - CNRS, France), Dr. Gilles Ledoux and Dr. Christophe Dujardin (Institut Lumière Matière, University of Lyon 1 - CNRS, France), Dr. Miguel Monge (University of La Rioja, Spain), Dr Rodica Chiriac and Dr. Alexandra Fateeva (Laboratoire des Multimatériaux et Interfaces, University of Lyon 1, France).

Polynuclear hybrid Au(I) compounds exhibit a very large domain of applications such as electronic devices, contrast agents, sensors or photocatalysts. All these applications are related to the ability of gold(I) to form aurophilic interactions which gives luminescent materials. Among gold species, thiolate gold(I) compounds are an important class of materials due to the high affinity of gold for sulfur that can generate molecular complexes, extended polymers, stabilized gold nanoparticles or SAM. Thus in nanoscience, thiolate gold(I) polymers are a key step in the Brust synthesis of functionalized gold nanoparticles. However relatively little is known about the relationship between the structure of the Au(I)-SR intermediates and the formation of the nanoparticles and the luminescence of thiolate gold nanoclusters. So to understand the photoluminescence and the formation of gold clusters, we study the synthesis and and carry out the structure resolutions by powder X-Ray diffraction of series of [Au(I)-SR]_n coordination polymers. We demonstrate that depending on the substituents of the thiolate ligands different structures are obtained (lamellar, helicoidal or cyclic) with various luminescent properties governed by Au-Au distances and gold atom environments. In addition some of these coordination polymers exhibit rare solid-state phase transitions from amorphous to crystalline states.

Figure 4 – Different structures and photophysical properties of [Au(SR)]_n coordination polymers. a. Compounds [Au(p-SPhCO₂X]n (X = H et Me) obtained in different solvent. b. Solid-state phase transition from amorphous to crystalline of [Au(SPh)]_n compound associated with the apparition of luminescence.

Research Projects

(Multi)-Emissive coinage Metal-Organic Chalcogenolate coordination polymers.
Phase change and transitions in coordination polymers.
Atomically well-defined gold thiolate clusters and their assembly for heterogeneous catalysis.
Redox activity in microporous porphyrinic MOFs.
Nanoparticles and thin films of Porous Metal-Organic Frameworks.
MOFs for hydrogen storage, carbon dioxide capture and selective gas-adsorption.
Multifunctional hybrid materials coupling magnetism and luminescence.

Current Members

PhD students:

Postdoc:

Dr. Shefali VAIDYA (from 2018)
Dr. Ahmad ABDALLAH (from 2019)

Undergrad students:

Visiting students:

Taiyo SUZUKI (Tokyo University – 2019)

Invited professors:

Pr. Takaaki TSURUOKA (Konan University – 2019-2020)

Alumni

PhD students:

Dr. Christophe LAVENN (2011-2014), now project manager at Air Liquid, Japan.
Dr. Zahraa SHAHIN (2016-2019)
Dr. Oleksandra VESELSKA (2016-2019), now researcher at Institute of Experimental and Applied Physics in Prague.

Postdocs:

Dr. William SALOMON (2017)
Dr. Guillaume ROUSSEAU (2014-2015)

Visiting students

Yuki OHARA (Kyoto University – 2017)