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

therefore chain formation. However for both II-13 and II-14 it is possible that this
Figure 2-14. Pair-wise dimer formation of theoretical manganese complex of II-14
difference could result in the preferred formation of the pair-wise interaction as depicted
in Figure 2-14 c. This compound would still potentially be interesting in its own right as
the four manganese ions would aligned in the same direction through intermolecular
antiferromagnetic exchange coupling with the radical ligands of the neighbouring
molecule giving a total ground state spin of S = 19.
Compound II-15 is a known diradical 22 with an open shell singlet ground state. In
the solid state this compound associates strongly with itself to form diamagnetic dimers. 23
If this diradical were reacted with two equivalents of the manganese hfac starting
material and the robust packing motif were maintained, then S-O contacts on both sides
would ensure that the chains were propagated in both directions as depicted in Figure 2-
15. While the diradical is disjointed, the spin vectors for each ring would likely couple
antiferromagnetically to the manganese ions such that the spins of the unpaired electron
for each radical would have the same orientation. This would force the spin vectors for
98