A Symmetry-Breaking Spin-State Transition in Iron(III) (pages 896–900)
Dr. Michael Griffin, Stephen Shakespeare, Dr. Helena J. Shepherd, Dr. Charles J. Harding, Dr. Jean-François Létard, Dr. Cédric Desplanches, Dr. Andrés E. Goeta, Prof. Judith A. K. Howard, Prof. Dr. Annie K. Powell, Dr. Valeriu Mereacre, Prof. Dr. Yann Garcia, Dr. Anil D. Naik, Dr. Helge Müller-Bunz and Dr. Grace G. Morgan
Article first published online: 12 NOV 2010 | DOI: 10.1002/anie.201005545
Stepping up: A two-step magnetic spin transition with accompanying structural phase transitions is reported for the first time for FeIII. The transitions are observed at 187 K and 90 K on cooling with a hysteretic transition recorded upon heating during the first crossover at 106 K. The intermediate phase persists over 97 K and contains an unprecedented [HS-HS-LS] motif with tripling of the unit cell.