Rapid photoinduced charge injection into covalent polyoxometalate-bodipy conjugates
| Autor: | Fiona A. Black, Sandra Alves, Aurélie Jacquart, Guillaume Izzet, Georgios Toupalas, Anna Proust, Ian P. Clark, Elizabeth A. Gibson |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
010405 organic chemistry General Chemistry Chromophore 010402 general chemistry Photochemistry 01 natural sciences 7. Clean energy Photoinduced electron transfer 0104 chemical sciences chemistry.chemical_compound Chemistry chemistry Covalent bond Polyoxometalate Ultrafast laser spectroscopy Surface modification BODIPY Spectroscopy |
| Zdroj: | Chemical Science |
| ISSN: | 2041-6520 |
| Popis: | A series of redox tunable polyoxometalate–bodipy conjugates display variable charge transfer dynamics occuring down to 54 ps. Controlled design of photoactive hybrids would provide highly active materials for solar energy conversion and photo(electro) catalysis. We describe the kinetics of photoinduced electron transfer in a series of photoactive hybrids based on Keggin-type polyoxometalates (POMs) covalently grafted to bodipy photosensitizers. We show how the electronic properties and corresponding dynamics of these hybrids can be readily tuned by varying the POM metal ion, the anchoring functionalization and the spacer length. Ultrafast visible and IR transient absorption spectroscopy, supported by spectroelectrochemical measurements, reveals that photoinduced electron transfer from the bodipy chromophore to the organosilyl POM derivative occurs as rapidly as τ = 54 ps to generate a long-lived (τ = 4.8 ns) charge-separated (CS) state, making this system appropriate for applications in photoelectrochemical devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|