A series of 6-oxo-verdazyl radicals functionalised at the 1- and 5-positions by tolyl, thioanisole and iodophenyl groups were synthesised using conventional strategies. Facile Sonogashira cross-coupling reactions of terminal alkynes with the diiodo derivative were used for synthetic elaboration of the verdazyl core structure with pi-conjugated ethynyl groups. The radicals were characterised by EPR spectroscopy, single-crystal X-ray diffraction, cyclic voltammetry and optical spectroscopy. The chemically and electrochemically reversible oxidation and reduction of these radicals within a convenient redox window permitted further studies on the closed-shell cationic and anionic forms using spectroelectrochemical methods, supported by (TD-)DFT calculations.
|Number of pages||20|
|Journal||Journal of Materials Chemistry C|
|Early online date||21 Dec 2021|
|Publication status||Published - 7 Feb 2022|