Molecular switches, electrochemistry and molecular electronic devices
Prussian Blue Analogs (PBAs) have been extensively explored in the past two decades because of their remarkable magnetic, optical and electrical properties.
Recently, we developed original photo- and electro-switchable A{Fe4Co4} cubic complexes containing an inserted alkali ion (A). The cubes are composed of three [Fe(II),LS-CN-Co(III),LS] pairs (and only one [Fe(II),LS-CN-Co(II),HS]) which can show photo-induced Electron Transfer coupled to a Spin Transition (ETCST). In addition to their photomagnetic properties, these cubes are ideal candidates for the fabrication of molecular electronic devices because of the multiple electron transfers they offer. Indeed, the cobalt spin change could be exploited for the fabrication of organic field-effect transistors.
In order to develop this aspect, the system needs to be immobilized onto a surface. This strategy requires RTp ligands to be tailored with anchoring groups. The strong versatility of the scorpionate ligands has been recently used by the ERMMES team to develop new materials. This know-how will be used to design Fe-Co cubes functionalized with anchoring functions like thiophene derivatives, thiols or diazonium salts.
In a second stage, this cube will be studied by using ultra-fast electrochemical methods, and the standard potentials as well as the kinetics of spin transitions will be determined.
Finally, the last part of the project will be focused on cube immobilization on gold gate electrodes and on the design of Cube-Gated Organic Field-Effect Transistors with self-assembled or electro-assembled cubes.
The recruited candidate must have a strong background in organic and inorganic synthesis. Experience in electrochemistry would be appreciated. The recruited candidate must be autonomous and have a strong interest in multidisciplinary subjects.
DATES:
Available ASAP, for 1 year
Funded by LabEx MiChem part of French state funds managed by the ANR within the Investissements d'Avenir programme under reference ANR-11-IDEX-0004-02
CONTACT
NAME : L. FILLAUD (laure.fillaud@sorbonne-universite.fr) /R. LESCOUEZEC (rodrigue.lescouezec@sorbonne-universite.fr)
LABORATORY : LISE/IPCM
This project propose to realize the first molecule-based devices working at room temperature and using photomagnetic molecular Prussian Blue Analogues. On the one hand, we will rationalize the redox behavior of Fe-Co cube molecular structures, which is important to explain their photomagnetic effect. On the other hand, modified surfaces will be prepared and : (i) their switching rate will be assessed by ultrafast cyclic voltammetry, (ii) the incorporation of these electro-switchable molecules in molecular electronic devices such as organic field-effect transistors will be performed.
Informations générales