Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(II) complexes

Philipp Dierks; Ayla Kruse; Olga S Bokareva; Mohammed J Al-Marri; Jens Kalmbach; Marc Baltrun; Adam Neuba; Roland Schoch; Stephan Hohloch; Katja Heinze; Michael Seitz; Oliver Kühn; Stefan Lochbrunner; Matthias Bauer

doi:10.1039/d1cc01716k

Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(II) complexes

Chem Commun (Camb). 2021 Jul 6;57(54):6640-6643. doi: 10.1039/d1cc01716k.

Authors

Affiliations

¹ Faculty of Science, Chemistry Department and Centre for Sustainable Systems Design, Paderborn University, 33098 Paderborn, Germany. matthias.bauer@upb.de.
² Institute of Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany.
³ Institute of Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany and Department of Physical Chemistry, Kazan Federal University, 420008 Kazan, Russia.
⁴ Institute of Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany and College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.
⁵ Institute of Inorganic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
⁶ University of Innsbruck, Faculty of Chemistry and Pharmacy, Institute for General, Inorganic and Theoretical Chemistry, Innrain 80-82, Innsbruck 6020, Austria.
⁷ Department of Chemistry, Johannes Gutenberg, University of Mainz, 55128 Mainz, Germany.

PMID: 34126627
DOI: 10.1039/d1cc01716k

Abstract

Two closely related FeII complexes with 2,6-bis(1-ethyl-1H-1,2,3-triazol-4yl)pyridine and 2,6-bis(1,2,3-triazol-5-ylidene)pyridine ligands are presented to gain new insights into the photophysics of bis(tridentate) iron(ii) complexes. The [Fe(N^N^N)2]2+ pseudoisomer sensitizes singlet oxygen through a MC state with nanosecond lifetime after MLCT excitation, while the bis(tridentate) [Fe(C^N^C)2]2+ pseudoisomer possesses a similar 3MLCT lifetime as the tris(bidentate) [Fe(C^C)2(N^N)]2+ complexes with four mesoionic carbenes.