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

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review


  • Author: Zimmer, Peter

    Paderborn University, Germany

  • Author: Burkhardt, Lukas

    Paderborn University, Germany

  • Author: Schepper, Rahel

    Paderborn University, Germany

  • Author: Zheng, Kaibo

    Organic Chemistry, NanoChemistry, Department of Chemistry, Technical University of Denmark, Kemitorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Gosztola, David

    Argonne National Laboratory, United States

  • Author: Neuba, Adam

    Paderborn University, Germany

  • Author: Flörke, Ulrich

    Paderborn University, Germany

  • Author: Wölper, Christoph

    University of Duisburg-Essen, Germany

  • Author: Schoch, Roland

    Paderborn University, Germany

  • Author: Gawelda, Wojciech

    European XFEL, Germany

  • Author: Canton, Sophie E.

    Deutsches Elektronen-Synchrotron, Germany

  • Author: Bauer, Matthias

    Paderborn University, Germany

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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 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
Issue number48
Pages (from-to)5203-5214
Number of pages12
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Photochemistry, Iron complexes, Cobalt, Iron, Dyad

ID: 163149943