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Portail > Offres > Offre UMR5798-GEDJON-002 - Poste postdoctoral (H/F): spectroscopie optique ultrarapide des rotaxanes photoactifs

Postdoctoral position (H/F): ultrafast optical spectroscopy of photoactive rotaxanes

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : lundi 2 novembre 2020

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General information

Reference : UMR5798-GEDJON-002
Workplace : TALENCE,TALENCE
Date of publication : Monday, October 12, 2020
Type of Contract : FTC Scientist
Contract Period : 9 months
Expected date of employment : 1 January 2021
Proportion of work : Full time
Remuneration : 2204 or more according to experience
Desired level of education : PhD
Experience required : Indifferent

Missions

The project developed jointly with colleagues from the Institute of Molecular Sciences (ISM - UMR 5525) and within the framework of the ANR PETIMIT concerns the study of interconnected molecular systems of the "rotaxane" type, with a view to producing new functions at the molecular level. The first structures were designed so that a photoinduced electron transfer causes a modulation or “blinking” of fluorescence thanks to the intramolecular movements. At the same time, it is envisaged in this post-doc work to exploit the sub-molecular translational movement as a means of moving electrons and energy. The first mechanism, effectively employed to separate charge by certain enzymes such as NO synthase, remains unprecedented in artificial molecules. The mastery by the organic nanostructures group of the ISM of the synthesis of interconnected nano-systems makes it possible to envisage an extension of the properties by the introduction of molecular fragments endowed with the properties of photochromism, redox and / or exhibiting wide contrast in optics. non-linear.
The researcher's work will make it possible to quantify the efficiency of electron transfer by electrochemical measurements as well as stationary absorption and fluorescence measurements, and to correlate it with the different states of the coupled photochromic system. The fluorescence and transient absorption measurements by fs, ps and ns experiments will provide information on the electron transfer rates, thus making it possible to finely characterize the movements of rotaxanes in the various states.

Activities

Main activities :
- sample preparation (solutions),
- characterization by stationary spectroscopic means (absorption and emission),
- fs-ps-ns-µs transient absorption and emission measurements,
- results processing,
- model development and kinetics modeling,
- writing of reports and articles.
Secondary or assisted activities:
- redox potential measurements (electrochemistry),
- alignment and modifications of lasers and spectroscopic experiments.

Skills

As the project is in partnership between the LOMA (physics) and ISM (chemistry) laboratories, the candidate must have solid skills in:
- physics (optics and lasers),
- time-resolved optical spectroscopy dedicated to the study of electronic and photodynamic properties of organic compounds.
The candidate must have a strong interest in organic chemistry to which he (she) will be trained in the Organic Nanostructures team at ISM.
The candidate must be fluent in English and / or French.

Work Context

The work will be carried out within the framework of ANR PETIMIT. This project is jointly developed with colleagues from the Institute of Molecular Sciences (ISM - UMR 5525) and it concerns the study of interconnected molecular systems of the "rotaxane" type, with a view to producing new functions at the molecular level. The candidate will perform time-resolved spectroscopic measurements (fs-ps-ns-µs-ms) followed by analysis of results. All equipment: fs, ps and ns laser systems tunable in UV-Vis-NIR wavelength followed by spectroscopic setups to perform transient absorption and time-resolved emission measurements are available on site (LOMA and ISM) .

Constraints and risks

- use of type IV lasers (UV-Vis-NIR)
- handling of solvents

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