1,2,3-Dithiazolyl and 1,2,35-Dithiadiazolyl Radicals as Spin-Bearing ...

similar to compounds II-1 and II-2, but as a complex ion could potentially act as a noninnocent
ligand or could provide a pathway for charge transfer between the metal nuclei.
For example if both ions started in the 3+ oxidation state, the additional electron could
potentially transfer via a ligand to metal charge transfer (LMCT) to one metal or the other
to give a 2+ and 3+ metal. The could give rise to so-called valence tautomers 4 and could
III-7
III-8
potentially have application to such fields as magnetic memory or molecular switches.
Typically, the oxidation states can be tuned such that the application of some external
stimulus can be used to activate the transition from one magnetic state to another.
Photoinduced electron transfer is one of the most widely studied phenomena, 5,6 however
the different oxidation states can also be accessed by a change in temperature, pressure,
electrochemical redox reactions or chemical treatments. 7
The crystallographic data for III-3 shows that the intermolecular interactions are
quite interesting and could have repercussions with respect to the magnetic behaviour of
a radical with similar contacts to those seen in Figure 3-3. The position of the acetyl
group makes these interactions possible and this is not affected by any electrostatic
122