Stable Organic Radicals: Synthesis, Properties and Applications

Dear Colleagues,

Since Gomberg’s discovery of the triphenylmethyl radical in 1900, persistent and stable organic radicals have been at the forefront of materials discovery. The higher reactivity associated with the presence of unpaired electrons was a hurdle that had to be overcome for applications to emerge. Great efforts have been made to develop design and synthetic strategies that have enabled the preparation and isolation of stable organic radicals, which has provided the opportunity to study their properties. One of the most well-studied solid-state properties of stable organic radicals is magnetism. For the longest period of time, bulk ferromagnetism was considered elusive due to the Heisenberg-like spins; therefore, it is necessary to construct a three-dimensional network for ferromagnetic interactions. However, since the discovery of Kinoshita and coworkers in 1991 of the β-phase of p-NPNN exhibiting ferromagnetic orders below 0.6 K, significant advances and breakthroughs have been witnessed. While the target, to this day, remains a purely organic ferromagnet with an ordering temperature that is high enough to permit applications, a range of other interesting magnetic properties has emerged, including magnetic bistability with considerable hysteresis. More recently, several research groups examined the ability of stable organic radicals to form thin films and their application in electronic, optoelectronic, and spintronic devices.

This Special Issue of Magnetochemistry aims to publish a collection of articles illustrating the recent achievements in the preparation, solution, and solid-state characterization of stable organic radicals.

Dr. Christos P. Constantinides
Guest Editor

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• molecular magnetism
• ferromagnetism
• antiferromagnetism
• thiazyls
• hydrazyls
• nitroxides and nitronyl nitroxides
• phenalenyls
• crystal engineering
• structure–magnetism correlations
• organic radical cations and anions
• electron paramagnetic resonance (EPR)
• cyclic voltammetry (CV)
• SQUID magnetometry