posted on 2015-10-29, 00:00authored byScott
M. Dyar, Eric A. Margulies, Noah E. Horwitz, Kristen E. Brown, Matthew D. Krzyaniak, Michael R. Wasielewski
We report on a novel small organic
molecule comprising a perylene
chromophore fused to a six-membered ring containing a persistent nitroxide
radical to give a perylene-nitroxide, or PerNO•. This molecule is a robust, compact molecule in which the radical
is closely bound to the chromophore but separated by saturated carbon
atoms, thus limiting the electronic coupling between the chromophore
and radical. We present both ultrafast transient absorption experiments
and time-resolved EPR (TREPR) studies to probe the spin dynamics of
photoexcited PerNO• and
utilize X-ray crystallography to probe the molecular structure and
stacking motifs of PerNO• in the solid state. The ability to control both the structure and
electronic properties of molecules having multiple spins as well as
the possibility of assembling ordered solid state materials from them
is important for implementing effective molecule-based spintronics.