0000000000729737
AUTHOR
David Hunger
Spin Crossover and Long-Lived Excited States in a Reduced Molecular Ruby.
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…
CCDC 1958093: Experimental Crystal Structure Determination
Related Article: Patrick B. Becker, Christoph Förster, Luca M. Carrella, Piet Boden, David Hunger, Joris van Slageren, Markus Gerhards, Eva Rentschler, Katja Heinze|2020|Chem.-Eur.J.|26|7199|doi:10.1002/chem.202001237