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Authors: Becker, Patrick M.
Förster, Christoph
Carrella, Luca M.
Boden, Pit
Hunger, David
van Slageren, Joris
Gerhards, Markus
Rentschler, Eva
Heinze, Katja
Title: Spin crossover and long-live excited states in a reduced molecular ruby
Online publication date: 9-Aug-2021
Language: english
Abstract: The chromium(III) complex [CrIII(ddpd)2]3+ (molecular ruby; ddpd=N,N′-dimethyl-N,N′-dipyridine-2-yl-pyridine-2,6-diamine) is reduced to the genuine chromium(II) complex [CrII(ddpd)2]2+ with d4 electron configuration. This reduced molecular ruby represents one of the very few chromium(II) complexes showing spin crossover (SCO). The reversible SCO is gradual with T1/2 around room temperature. The low-spin and high-spin chromium(II) isomers exhibit distinct spectroscopic and structural properties (UV/Vis/NIR, IR, EPR spectroscopies, single-crystal XRD). Excitation of [CrII(ddpd)2]2+ with UV light at 20 and 290 K generates electronically excited states with microsecond lifetimes. This initial study on the unique reduced molecular ruby paves the way for thermally and photochemically switchable magnetic systems based on chromium complexes complementing the well-established iron(II) SCO systems.
DDC: 540 Chemie
540 Chemistry and allied sciences
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 09 Chemie, Pharmazie u. Geowissensch.
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
License: CC BY
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Journal: Chemistry - a European journal
Pages or article number: 7199
Publisher: Wiley-VCH
Publisher place: Weinheim
Issue date: 2020
ISSN: 1521-3765
Publisher URL:
Publisher DOI: 10.1002/chem.202001237
Appears in collections:JGU-Publikationen

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