Tweaking the Optoelectronic Properties of S‐Doped Polycyclic Aromatic Hydrocarbons by Chemical Oxidation

Autor: Oliwia Matuszewska, Tommaso Battisti, Ruben R. Ferreira, Nicolas Biot, Nicola Demitri, Cécile Mézière, Magali Allain, Marc Sallé, Samuel Mañas‐Valero, Eugenio Coronado, Elisa Fresta, Rubén D. Costa, Davide Bonifazi
Rok vydání: 2023
Předmět:
Zdroj: Chemistry – A European Journal. 29
ISSN: 1521-3765
0947-6539
Popis: Peri-thiaxanthenothiaxanthene, an S-doped analog of peri-xanthenoxanthene, is used as a polycyclic aromatic hydrocarbon (PAH) scaffold to tune the molecular semiconductor properties by editing the oxidation state of the S-atoms. Chemical oxidation of peri-thiaxanthenothiaxanthene with H2O2 led to the relevant sulfoxide and sulfone congeners, whereas electrooxidation gave access to sulfonium-type derivatives forming crystalline mixed valence (MV) complexes. These complexes depicted peculiar molecular and solid-state arrangements with face-to-face p-p stacking organization. Photophysical studies showed a widening of the optical bandgap upon progressive oxidation of the S-atoms, with the bis-sulfone derivative displaying the largest value (E00 = 2.99 eV). While peri-thiaxanthenothiaxanthene showed reversible oxidation properties, the sulfoxide and sulfone derivatives mainly showed reductive events, corroborating their n-type properties. Electric measurements of single crystals of the MV complexes exhibited a semiconducting behavior with a remarkably high conductivity at room temperature (10-1-10-2 S cm-1 and 10-2-10-3 S cm-1 for the O and S derivatives, respectively), one of the highest reported so far. Finally, the electroluminescence properties of the complexes were tested in light-emitting electrochemical cells (LECs), obtaining the first mid-emitting PAH-based LECs.
Databáze: OpenAIRE
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