Femtosecond Spin‐State Photoswitching of Molecular Nanocrystals Evidenced by Optical Spectroscopy

Quick change: Femtosecond optical pump–probe spectroscopy is used to study the photoswitching dynamics of FeIII spin-crossover nanocrystals. Results indicate that up to 10 % of the molecules can be photoswitched from low-spin to high-spin states within less than one picosecond. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.