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RESEARCH PRODUCT
Spin Crossover and Long-Lived Excited States in a Reduced Molecular Ruby.
Piet BodenEva RentschlerChristoph FörsterMarkus GerhardsKatja HeinzeLuca M. CarrellaDavid HungerJoris Van SlagerenPatrick B. Beckersubject
step-scan IR spectroscopychemistry.chemical_element010402 general chemistryPhotochemistry01 natural sciencesCatalysislaw.inventionChromiumSpin crossoverlawSpin CrossoverElectron paramagnetic resonanceexcited states010405 organic chemistryChemistryCommunicationOrganic ChemistryGeneral ChemistryCommunications0104 chemical sciencesMicrosecondExcited stateElectron configurationchromiummagnetic propertiesExcitationdescription
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 T 1/2 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-03-11 | Chemistry (Weinheim an der Bergstrasse, Germany) |