Electron localization at the single-molecule scale
(collaboration Profs S. Kandel and C. lent, Notre Dame, Indiana)
At the single-molecule level STM imaging establishes:
- Electronic coupling occurs through bonds
- The mixed-valence with the para topology is delocalized
- The mixed-valence with the meta topology is localized
(J. Am. Chem. Soc. 2012, 134, 1710-1714)
Spin crossover systems
(collaboration Prof. J.-Y. Saillard, Dr. O. Cador and Dr L. Ouahab Rennes)
Along the last decade we have developed a research focusing on molecular materials which exhibit Fe(II) spin transition. For example, the purple-colored bis(tert-butylscorpionate) iron(II) complex is fully low-spin at room temperature, despite the steric hindrance brought about by the six methyl groups in the equatorial belt. The remotely situated bulky tert-butyl substituent on boron acts like a locking screw for a vise, forcing the tripod-shaped ligand to close, thus favouring low-spin complex formation.
(Angew. Chem. Int. Ed., 2008, 47, 8687-8691)
A Tetrametallic complex with a square array
(Collaborations Prs M. I. Bruce, Adelaide, Australia and P.J. Low, Durham, UK)
First example of a selective dimerization of a molecular wire. (Organometallics, 2013)
A five-component functional molecule
(collaboration Prof. A. Miyazaki, Toyama, Japan, Dr. J.-F. Halet, K. Costuas and L. Ouahab, Rennes)
Molecule was prepared by a three one-electron activation process.
The molecular device displays specific properties which originate from closely intertwined combination of two iron centers, two TTFMe2 moieties and the carbon bridge.
(Chem. Eur. J. 2013, 19, 5742-5757)
Asymmetric schiff base complexes for NLO
(Collaboration Prof. C. Manzur and D. Carrillo, Valparaiso, Chile, Prof. I. Ledoux, ENS Cachan, Prof J.-Y. Saillard and Dr. S. Kahlal, Rennes)
Complexation of both the tetradentate N2O2 chelate and the salicylidene ring increases the 2nd order NLO response.
Design of functionalized O,N,N-tridentate metalloligand towards grafting and polymerization.
(Inorg. Chem. 2010, 49, 2750-2764, New J. Chem. 2011, 35, 2027-2036, Inorg. Chim. Acta 2012, 390, 184-189, J. Inorg. Organomet. Polym. Mater. 2013, 23, 1247-1254)