Research Thematics

 

 

Coordination driven self-assembly (S. Goeb, M. Sallé)

Metal-assisted self-assembly allows the synthesis of discrete molecular structures of various geometries under thermodynamic control. The resulting compounds generally show a cavity whose function depends on the nature of the side walls. A first line of our research concerns the development of stimulable tetrathiafulvalene-based electroactive structures able to modulate their guest affinity thanks to a redox stimulus. A second orientation concerns the development of interlocked coordination cages constructed from donor and acceptor units.

Recent financial supports

  • ANR JCJC BOMBER (2015-19) : 173 k€
  • CNRS, EMERGENCE@INC, INTERLOCKED (2018-2019) : 65 k€
  • Lumomat PHOTOCAGE (2019-20) : 60 k€

 

Supramolecular photo- and electroactive polymers (D. Canevet, M. Sallé)

Self-assembling functional monomers constitutes a key in bottom-up strategies to prepare nanostructured systems. Among different applications, designing nano- and microwires presents much interest to elaborate conducting and/or luminescent materials. In this context, we notably focus research efforts on pyrene-based organogelators (ex : Chem. Asian. J. 2016, Lai ; Chem. Eur. J. 2016, Lai, hot paper), which display singular spectroscopic properties. In the same vein, we are also interested in a family of organogelators, which displays unexpected nonlinear optical properties. Indeed, the functionalization of push-pull systems by moieties favouring unidirectional aggregation allowed the preparation of original xerogel-based materials, which spontaneously display a second harmonic generation activity (no need for pre-processing) (JACS, 2016, Marco ; Soft Matter 2016, Aparicio ;  Org. Biomol. Chem. 2018, Marco).

 

Photo- and redow-switchable foldamers (D. Canevet)

Foldamers constitute flexible architectures that fold and adopt well-defined and compact conformations. Among various families of foldamers, our research activities mainly focus on oligomers that tend to hybridize to form multiple helices. Our efforts follow two guidelines: demonstrating it is possible to control the multiplicities of the helices thanks to various kinds of stimulations in solution (ChemComm 2017, Aparicio ; ChemComm, 2019, Faour) and integrating these elaborated architectures into advanced materials (ChemComm, 2019, Adam).

Recent financial supports

  • MAGIQUES, 2014-2015, 54 k€, Angers Loire Métropole and University of Angers
  • FOLD, 2015-2016, 59 k€, LUMOMAT (Pays-de-la-Loire Region)
  • RECHERCHE, 2020-2024, 210 k€, National Research Agency (ANR, JCJC call)
  • ARDENT, 2020-2021, 154 k€, Pays-de-la-Loire Region

Perylenediimides and n-type semiconductors for organic electronics (A. Goujon, P. Hudhomme)

Perylenediimides (PDIs) are promising n-types organic semiconductors, due to their exceptional electron conductivities and accepting properties, wide and strong visible light absorption and intense emission, and high chemical/thermal/photostability. They find applications in devices ranging from organic light emitting diodes (OLEDs) to organic solar cells (OSCs). For these reasons the synthetic community still explore new synthetic methodologies and strategy to tune their optical/electronical properties and their self-assembly behaviour. We recently demonstrated that 1-nitroPDI derivatives, easy to prepare on large scale with minimal purification required, could be engaged in metal-catalysed cross coupling reactions. Examples of nitroarenes engaged in such reactions is still very rare in the literature. This circumvent the use of 1-bromoPDI, widely popular although tedious to prepare. NitroPDIs derivatives present several other advantages over their brominated counterparts, such as more selective reactivity allowing the preparation of asymmetric PDI triads, otherwise difficult to access.

We recently reported a new visible-light mediated pathway to access core-extended AzaBPI derivatives. These compounds have never been explored as semiconductors so far, and our strategy allows the preparation of more complex architectures such as dimers, trimers or asymmetric dyads, which performances will be evaluated in organic electronic devices.

Recent financial supports

  • AMAZ, 2020-2022, 30 k€, Angers Loire Métropole and University of Angers, AAP PULSAR-CR