Towards Noble-Metal-Free Dyads : Ground and Excited State Tuning by a Cobalt Dimethylglyoxime Motif Connected to an Iron N-Heterocyclic Carbene Photosensitizer
(2018) In European Journal of Inorganic Chemistry 2018(48). p.5203-5214- Abstract
Heteroleptic iron based complexes bearing the 2,6-bis[3-(2,6-diisopropylphenyl)imidazol-2-ylidene]pyridine motif and a polypridine ligand have been synthesized and characterized in their ground and excited state. This series of complexes includes a first example of a hetero-bimetallic complex connecting an iron N-heterocyclic carbene photosensitizer with a cobalt dimethylglyoxime fragment. Focus is set on the influence of the linker and cobalt center as second ligand at the iron center on the photophysics. While electronic absorption spectroscopy and cyclic voltammetry reveal a weak mutual influence of the single ligands in the heteroleptic complexes, an increasing MLCT lifetime with larger π-accepting abilities was found by... (More)
Heteroleptic iron based complexes bearing the 2,6-bis[3-(2,6-diisopropylphenyl)imidazol-2-ylidene]pyridine motif and a polypridine ligand have been synthesized and characterized in their ground and excited state. This series of complexes includes a first example of a hetero-bimetallic complex connecting an iron N-heterocyclic carbene photosensitizer with a cobalt dimethylglyoxime fragment. Focus is set on the influence of the linker and cobalt center as second ligand at the iron center on the photophysics. While electronic absorption spectroscopy and cyclic voltammetry reveal a weak mutual influence of the single ligands in the heteroleptic complexes, an increasing MLCT lifetime with larger π-accepting abilities was found by time-resolved transient absorption spectroscopy, with maximum lifetime in the case of the hetero-bimetallic dyad. Concurrently the MC lifetimes were observed to decrease. The reported results will allow to develop guidelines for designing bimetallic devices, which may allow electron transfer from the photosensitizer fragment to a catalytically active center.
(Less)
- author
- organization
- publishing date
- 2018-12-31
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Cobalt, Dyad, Iron, Iron complexes, Photochemistry
- in
- European Journal of Inorganic Chemistry
- volume
- 2018
- issue
- 48
- pages
- 12 pages
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85058715058
- ISSN
- 1434-1948
- DOI
- 10.1002/ejic.201800946
- language
- English
- LU publication?
- yes
- id
- da6aac3c-c509-40e5-ae94-5c4566676193
- date added to LUP
- 2019-01-14 11:28:30
- date last changed
- 2023-12-02 23:14:24
@article{da6aac3c-c509-40e5-ae94-5c4566676193, abstract = {{<p>Heteroleptic iron based complexes bearing the 2,6-bis[3-(2,6-diisopropylphenyl)imidazol-2-ylidene]pyridine motif and a polypridine ligand have been synthesized and characterized in their ground and excited state. This series of complexes includes a first example of a hetero-bimetallic complex connecting an iron N-heterocyclic carbene photosensitizer with a cobalt dimethylglyoxime fragment. Focus is set on the influence of the linker and cobalt center as second ligand at the iron center on the photophysics. While electronic absorption spectroscopy and cyclic voltammetry reveal a weak mutual influence of the single ligands in the heteroleptic complexes, an increasing MLCT lifetime with larger π-accepting abilities was found by time-resolved transient absorption spectroscopy, with maximum lifetime in the case of the hetero-bimetallic dyad. Concurrently the MC lifetimes were observed to decrease. The reported results will allow to develop guidelines for designing bimetallic devices, which may allow electron transfer from the photosensitizer fragment to a catalytically active center.</p>}}, author = {{Zimmer, Peter and Burkhardt, Lukas and Schepper, Rahel and Zheng, Kaibo and Gosztola, David and Neuba, Adam and Flörke, Ulrich and Wölper, Christoph and Schoch, Roland and Gawelda, Wojciech and Canton, Sophie E. and Bauer, Matthias}}, issn = {{1434-1948}}, keywords = {{Cobalt; Dyad; Iron; Iron complexes; Photochemistry}}, language = {{eng}}, month = {{12}}, number = {{48}}, pages = {{5203--5214}}, publisher = {{John Wiley & Sons Inc.}}, series = {{European Journal of Inorganic Chemistry}}, title = {{Towards Noble-Metal-Free Dyads : Ground and Excited State Tuning by a Cobalt Dimethylglyoxime Motif Connected to an Iron N-Heterocyclic Carbene Photosensitizer}}, url = {{http://dx.doi.org/10.1002/ejic.201800946}}, doi = {{10.1002/ejic.201800946}}, volume = {{2018}}, year = {{2018}}, }