Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 48, Pages 5203-5214Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201800946
Keywords
Photochemistry; Iron complexes; Cobalt; Iron; Dyad
Categories
Funding
- Swedish research council V. R. staring grant [2017-05337]
- Independent Research Fund Denmark Sapere Aude starting grant [7026-00037A]
- European Union [GINOP-2.3.6-15-2015-00001]
- European Regional Development Fund
- DOE Office of Science [DE-AC02-06CH11357]
- Fonds der Chemischen Industrie
- German ministry Bundesministerium fur Bildung und Forschung (BMBF) [05K14PP1]
- European XFEL GmbH
- National Science Centre (NCN) in Poland under SONATA BIS 6 grant [2016/22/E/ST4/00543]
- Helmoltz Recognition Award
- Swedish Research Council [2017-05337] Funding Source: Swedish Research Council
- Vinnova [2017-05337] Funding Source: Vinnova
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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 pi-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.
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