Post-doctoral position (M/F) to study the EPR/time-resolved spectroscopy of diarylethene-functionalized polyoxometallates.

23 Mar 2024
Job Information

Organisation/Company

CNRS

Department

Laboratoire Avancé de Spectroscopie pour les Interactions, la Réactivité et l'Environnement

Research Field

Physics

Researcher Profile

First Stage Researcher (R1)

Country

France

Application Deadline

12 Apr 2024 - 23:59 (UTC)

Type of Contract

Temporary

Job Status

Full-time

Hours Per Week

35

Offer Starting Date

29 Apr 2024

Is the job funded through the EU Research Framework Programme?

Not funded by an EU programme

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

Diarylethenes (DAEs) are very well known for their robust photochromic properties, which include excellent fatigue resistance, thermal reversibility, and high quantum yield. The integration of diarylethenes into molecular cages has revealed unique features like photoresponsive encapsulation and efficient energy transfer. Polyoxometalates (POMs), primarily composed of early transition metals, are distinguished by their diverse structural forms and catalytic prowess, especially in redox reactions. Ritchie et al. have made a significant breakthrough by developing the first POM-DAE molecular cage. This cage contains multiple DAE ligands that undergo sequential electrocyclization post-illumination, confirmed via transient absorption and NMR spectroscopy. The transient absorption studies further disclosed additional photoproducts during the illumination process. These include a charge-separated electron-hole pair of DAE+• and POM- with a lifespan exceeding 200 µ-seconds. This finding suggests that POM-DAE combinations could open new avenues in photocatalytic applications by leveraging these long-lived charge-separated states. (collaboration Chris Ritchie, Monash University)
The researcher's mission will be to carry out a new measurement and analysis campaign on a series of POM-DAE samples using EPR spectroscopy and transient absorption spectroscopy - techniques available at LASIRE.

POM-DAE sample preparation under inert atmosphere
UV-VIs /IR/RMN analysis spectroscopy
EPR spectroscopy
femtosecond absorption spectroscopy
flash photolysis (µseconds)

The post-doc is a transversal action in the LASIRE laboratory between the two teams.
The experiment will be launched at C4 (EPR) and C8 (TA).
All chemical preparations will take place in a newly renovated laboratory.
For transient spectroscopy, the researcher will be supported by the research engineer.

Requirements

Research Field

Physics

Education Level

PhD or equivalent

Languages

FRENCH

Level

Basic

Research Field

Physics

Years of Research Experience

None

Additional Information
Eligibility criteria

Polyoxometallate chemistry
stationary spectroscopy
EPR spectroscopy
transient absorption spectroscopy (TA)

Website for additional job details

https://emploi.cnrs.fr/Offres/CDD/UMR8516-STEALO-002/Default.aspx

Work Location(s)

Number of offers available

1

Company/Institute

Laboratoire Avancé de Spectroscopie pour les Interactions, la Réactivité et l'Environnement

Country

France

City

VILLENEUVE D ASCQ

Geofield

Where to apply

Website

https://emploi.cnrs.fr/Candidat/Offre/UMR8516-STEALO-002/Candidater.aspx

Contact

City

VILLENEUVE D ASCQ

Website

http://lasir.cnrs.fr

STATUS: EXPIRED