Dataset Information


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 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.


PROVIDER: S-EPMC7318154 | BioStudies | 2020-01-01

REPOSITORIES: biostudies

Similar Datasets

2007-01-01 | S-EPMC2596585 | BioStudies
2018-01-01 | S-EPMC6247521 | BioStudies
2018-01-01 | S-EPMC6426449 | BioStudies
2019-01-01 | S-EPMC6640196 | BioStudies
2009-01-01 | S-EPMC2722653 | BioStudies
2017-01-01 | S-EPMC6641455 | BioStudies
2018-01-01 | S-EPMC6330572 | BioStudies
2013-01-01 | S-EPMC3883978 | BioStudies
2012-01-01 | S-EPMC3476337 | BioStudies
2019-01-01 | S-EPMC6457345 | BioStudies