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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Organic Thin Films, Organic-Inorganic Interfaces (joint session DS/CPP)

CPP 9.4: Talk

Monday, March 27, 2023, 12:15–12:30, SCH A 315

Controlled Thermal Deposition of Organic Diradicals — •Tobias Junghöfer and Maria Benedetta Casu — Institut für Physikalische und Theoretische Chemie, Eberhard Karls Universität Tübingen, Germany

Using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) we demonstrate 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 also in the case of very stable single radicals. We have explored the parameters that play a role in this phenomenon. We found that the higher the formation energies of the crystal, the more difficult is the evaporation of intact radicals. Large delocalization of the unpaired electrons helps the diradical to stand evaporation. The evaporation of different diradicals can be successfully addressed considering our findings.