Journal article
Towards Noble-Metal-Free Dyads: Ground and Excited State Tuning by a Cobalt Dimethylglyoxime Motif Connected to an Iron N-Heterocyclic Carbene Photosensitizer
Paderborn University1
Department of Chemistry, Technical University of Denmark2
NanoChemistry, Department of Chemistry, Technical University of Denmark3
Organic Chemistry, Department of Chemistry, Technical University of Denmark4
Argonne National Laboratory5
University of Duisburg-Essen6
European XFEL7
German Electron Synchrotron8
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.
Language: | English |
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Year: | 2018 |
Pages: | 5203-5214 |
ISSN: | 10990682 and 14341948 |
Types: | Journal article |
DOI: | 10.1002/ejic.201800946 |
ORCIDs: | 0000-0002-9294-6076 and Zheng, Kaibo |