Towards Noble-Metal-Free Dyads: Ground and Excited State Tuning by a Cobalt Dimethylglyoxime Motif Connected to an Iron N-Heterocyclic Carbene Photosensitizer

Peter Zimmer, Lukas Burkhardt, Rahel Schepper, Kaibo Zheng, David Gosztola, Adam Neuba, Ulrich Flörke, Christoph Wölper, Roland Schoch, Wojciech Gawelda, Sophie E. Canton, Matthias Bauer*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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 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.
Original languageEnglish
JournalEuropean Journal of Inorganic Chemistry
Volume2018
Issue number48
Pages (from-to)5203-5214
Number of pages12
ISSN1434-1948
DOIs
Publication statusPublished - 2018

Keywords

  • Photochemistry
  • Iron complexes
  • Cobalt
  • Iron
  • Dyad

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