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Towards Noble‐Metal‐Free Dyads: Ground and Excited State Tuning by a Cobalt Dimethylglyoxime Motif Connected to an Iron N‐Heterocyclic Carbene Photosensitizer
Author(s) -
Zimmer Peter,
Burkhardt Lukas,
Schepper Rahel,
Zheng Kaibo,
Gosztola David,
Neuba Adam,
Flörke Ulrich,
Wölper Christoph,
Schoch Roland,
Gawelda Wojciech,
Canton Sophie E.,
Bauer Matthias
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800946
Subject(s) - chemistry , dimethylglyoxime , photochemistry , bimetallic strip , cobalt , photosensitizer , carbene , excited state , metal , inorganic chemistry , organic chemistry , catalysis , physics , nuclear physics
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.