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
Year of first publication:	2020
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
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-6257
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Chemistry - a European journal 26 32
Pages or article number:	7199 7204
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2020
ISSN:	1521-3765
Publisher URL:	https://doi.org/10.1002/chem.202001237
Publisher DOI:	10.1002/chem.202001237
Appears in collections:	JGU-Publikationen