  We have demonstrated that it is possible to evaporate diradicals in a
controlled environment obtaining thin films in which the diradical character is
preserved. However, evaporation represents a challenge. The presence of two
radical sites makes the molecules more reactive, even in case of very stable
single radicals. We have explored the parameters that play a role in this
phenomenon. Bulk formation thermodynamics and delocalisation of the unpaired
electrons play the major role. The higher the formation energies of the
crystal, the more difficult is the evaporation of intact radicals. The larger
the delocalization, the more stable is the film exposed to air. The evaporation
of different radicals, also with a larger number of radical sites can be
successfully addressed considering our findings.
