Such a stability is a necessary precondition to use radical-based SAMs for any practical application. 21–23,25 The radical character of the layers was proved by several techniques (UV-vis, cyclic voltammetry, EPR, NEXAFS and UPS) however, a careful and in-depth characterization of the stability of these radical SAMs has not been carried out so far. 24 Previously, self-assembled monolayers (SAMs) of PTM on gold substrates have been investigated to study their transport properties. PTM is a very persistent and stable radical that shows a long coherence time at room temperature, being a strong potential candidate for quantum technologies. In this work, we capitalize our knowledge of radical thin films and interfaces by studying the functionalization of gold surfaces with derivatives of the perchlorotriphenylmethyl (PTM) radical. Nitroxides (TEMPO), 14–17 nitronyl nitroxides 18–20 and tripheylmethyl 21–23 radicals have been successfully employed to prepare such paramagnetic hybrid materials. More recently, alkyne terminated derivatives have started to play a role. Usually thiols and disulfides are chosen to covalently modify gold surfaces, including gold nanoparticles, with organic radicals by adsorption from solution. However, the radical functionalization of a substrate is eased by choosing a specific chemical group that has a high chemical affinity for the selected substrate. 9 Our work indicated the need for identifying strategies in order to attach the radical to the surface preserving its magnetic moment at the interface by using different methods ranging from evaporation to preparation in a wet environment. We have recently demonstrated that a Blatter radical derivative is a potential quantum bit and we attached it to copper contacts to investigate the influence of a substrate on the radical magnetic moment. 1–8 In this framework, organic radicals are exceptionally promising in various fields, and the research on radical thin films and interfaces has recently flourished, due to their potential use in applications from quantum computing to organic electronics and spintronics. Molecular systems are materials that intersect with many different promising fields such as organic/molecular spintronics, electronics, and organic magnetism.
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