Abstract
The cover picture shows the photoswitching of an intramolecular magnetic interaction by means of a photochromic diarylethene spin coupler. The magnetic interaction between two nitronyl nitroxide radicals placed at both ends of the diarylethene was switched by alternate irradiation with UV and visible light (top). The open-ring isomer (middle left) has disconnected π-conjugated systems, while the closed-ring isomer (middle right) has a delocalized π-system throughout the molecule. The change in exchange interaction between the open- and closed-ring isomers was determined to be more than 30-fold by ESR spectroscopy (bottom). The study of magnetic interaction and photochromic reactivity is described in more detail by K. Matsuda and M. Irie on p. 3466 ff.
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