Abstract
Two chiral PROXYL groups bridged with azobenzene show the change of the magnetic properties with the trans-cis photoisomerization of the azobenzene moiety. The isomerization brought the radicals closer together and increased the exchange interactions. The spin state of the cis-isomer was determined from two-dimensional nutation spectra as a mixture of S = 1/2 and S = 1. This is an example of the optical control of through-space intramolecular magnetic interactions.
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