| EPSRC Reference: |
GR/T03345/01 |
| Title: |
Light-Switchable Molecular Devices Based on Metal Chromophores |
| Principal Investigator: |
Weinstein, Professor JA |
| Other Investigators: |
|
| Researcher Co-Investigators: |
|
| Project Partners: |
|
| Department: |
Sch of Chemistry |
| Organisation: |
University of Nottingham |
| Scheme: |
Advanced Fellowship (Pre-FEC) |
| Starts: |
01 October 2004 |
Ends: |
31 January 2005 |
Value (£): |
254,707
|
| EPSRC Research Topic Classifications: |
| Chemical Biology |
Chemical Synthetic Methodology |
|
| EPSRC Industrial Sector Classifications: |
| Chemicals |
Healthcare |
| Pharmaceuticals and Biotechnology |
|
|
| Related Grants: |
|
| Panel History: |
| Panel Date | Panel Name | Outcome |
|
21 Apr 2004
|
Chemistry Fellowships Interview Panel 2004
|
Deferred
|
|
18 Mar 2004
|
Chemistry Fellowships Sift Panel 2004
|
Deferred
|
|
|
Summary on Grant Application Form |
|
A photoinduced charge-separated excited state is the key transient in a variety of light energy conversion processes, from photosynthesis to photocatalysis. The issue of vital importance is how to make this excited state longer-lived, by inhibiting various decay processes, so that such excited state has sufficient lifetime to become engaged in a desired chemical event. I address this question in a conceptually new way, by exploring a new type of simple structural reorganisation in the excited state as a tool to stabilize charge separation. I will use an ultrafast formation of a transient sulfur-sulfur three-electron bond, S.. S, on a metal template to achieve the difference in geometry and bonding in the excited state if compared to the ground state, thus providing a tool to control and/or block back electron transfer. [diimine-Metal-thiolate] (M = Pt, Pd) complexes lie at the core of this approach, providing a synthetically feasible and easily modifiable system. These complexes possess a low-energy charge-separated excited state, in which electron transfer from the thiolate moiety to the diimine ligand can lead to the formation of a new S.-. S bond, providing an energetic barrier to back electron transfer and stabilising charge-separation. We will explore and develop this concept by combining of organometallic synthesis, advanced time-resolved spectroscopic techniques and theoretical calculations in an internationally collaborative and interdisciplinary manner. We will explore a combination of the thiolate complexes with S.-. S approach to (i) develop new synthons for supramolecular chemistry; (ii) contribute to the fundamental understanding of radiation damage of DNA; (iii) rationally design new non-linear optical materials via the Structure-Property Relationships; (iv) contribute to understanding of early stage dynamics of biomolecules through development of new highly emissive biomolecular probes in combination with fast time-resolved spetcroscopy. This research, if successful, will open up new exciting avenues in controlling photoreactivity of coordination compounds. Furthermore, the outcome of our fundamental study on transient S-S interaction on a metal template can potentially make a major contribution to unravel the mechanisms by which Nature utilises the presence of two sulfur centres in close proximity to a metal centre in the processes involving electron transfer.
|
|
Key Findings |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Potential use in non-academic contexts |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Impacts |
|
| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
|
| Date Materialised |
|
|
|
|
Sectors submitted by the Researcher |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
| Project URL: |
|
| Further Information: |
|
| Organisation Website: |
http://www.nottingham.ac.uk |