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†‡

Philipp Dierks,^a Ayla Kruse,^b Olga S. Bokareva,

^bc Mohammed J. Al-Marri,

^bd Jens Kalmbach,^e Marc Baltrun,^a Adam Neuba,^a Roland Schoch,

^a Stephan Hohloch,

^f Katja Heinze,

^g Michael Seitz,

^e Oliver Kühn,

^b Stefan Lochbrunner

^b and Matthias Bauer

*^a

Author affiliations

* Corresponding authors

^a Faculty of Science, Chemistry Department and Centre for Sustainable Systems Design, Paderborn University, 33098 Paderborn, Germany
E-mail: matthias.bauer@upb.de

^b Institute of Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany

^c Department of Physical Chemistry, Kazan Federal University, 420008 Kazan, Russia

^d College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar

^e Institute of Inorganic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany

^f University of Innsbruck, Faculty of Chemistry and Pharmacy, Institute for General, Inorganic and Theoretical Chemistry, Innrain 80-82, Innsbruck 6020, Austria

^g Department of Chemistry, Johannes Gutenberg, University of Mainz, 55128 Mainz, Germany

Abstract

Two closely related Fe^II 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.

Chemical Communications

Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(ii) complexes†‡

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

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