Self-Assembly and aggregation of functionalized polyoxometalates. Preparation of Recyclable Catalysts by Post-functionalization of Hybrid Polyoxometalates.

Bernold Hasenknopf (Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, France)

Serge Thorimbert (Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, France)

Location: Aula 118, ETSEQ
Start time: March 22, 2013, 12 p.m.

Abstract

Self-Assembly and aggregation of functionalized polyoxometalates.

Supramolecular chemistry has established the concepts for the self-assembly of complex architectures and smart materials. Organic molecules are often determining the outcome of such processes. Therefore, the attachment of POMs to suitable organic molecules yields organic-inorganic hybrids that are useful constituents for the incorporation of POMs into supramolecular systems.
Beside the discussion of the synthetic chemistry involved, this presentation focuses on two different approaches: i) the grafting of ligands with free binding sites for the self-assembly of supramolecular architectures through the coordination of transition metals. The geometric constrains imposed by the coordination vectors of these ligands determine the outcome of metal complexation, such as coordination polymers or discrete species. ii) the grafting of thermoresponsive polymers for the preparation of smart materials that include POMs. Different synthetic procedures and the characterization of the POM-polymer hybrids will be presented.

Preparation of Recyclable Catalysts by Post-functionalization of Hybrid
Polyoxometalates.

In a collaborative work with Bernold Hasenknopf and E. Lacôte from the “Institut Parisien de
Chimie Moleculaire” at the University Pierre et Marie Curie, we developed the preparation
and post-functionalization of hybrid polyoxometalates.1 These organic-inorganic compounds
with modular redox2 or acidic properties3 are selective homogeneous recyclable catalysts for
C-C, C-N or S-O bond formation. We recently demonstrated the positive influence of POM
for Gold or Palladium-catalyzed reactions.4 Some of these hybrids are chiral and after having
worked toward their kinetic resolution,5 we are now studying them as possible chiral
inductors. An overview of that work will be presented.

Email announcement

About Bernold Hasenknopf

Institution: Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, France

Bernold Hasenknopf studied chemistry in Germany, France and Great Britain, and obtained his Ph. D. in 1996 under the supervision of Jean-Marie Lehn at the University of Strasbourg for his work on circular helicates. He then joined the group of Peter Schultz in Berkeley for one year to work on unnatural biopolymers and catalytic antibodies. In 1997, he became faculty member of the University Pierre and Marie Curie in Paris where he is full professor now. His research interests focus on supramolecular chemistry of multimetallic assemblies, and their interactions with biomolecules. In a very close and fruitful collaboration with Serge Thorimbert and Emmanuel Lacôte since more than ten years, he developed methods for organic post-functionalization of polyoxometalates. In 2009, he founded a group for supramolecular chemistry at the Institut Parisien de Chimie Moléculaire. His current projects concern the assembly of polyoxometalates, polyrotaxanes for bimodal imaging and switchable magnetic tweezers.

About Serge Thorimbert

Institution: Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie, France

Serge Thorimbert worked under the supervision of Prof. J.-P. Genêt at the Ecole Nationale Supérieure de Chimie de Paris and received his PhD in Chemistry from the University Pierre et Marie Curie (UPMC). He moved in 1993 to the MPI in Mülheim/Rhur (Germany) to work with Prof. W. F. Maier on the preparation of heterogeneous catalysts for olefin epoxidation. In 1995, he became faculty member of the UPMC working with Prof. M. Malacria and has been promoted Full Professor there in 2010. In 1998, he joined Don Craig’s group for one year at the Imperial College (London UK) as an academic visitor. He is now team leader of a group working on the synthesis of new heterocycles for medicinal chemistry. His research also focused on the preparation of chiral polyoxometalates for catalysis.

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