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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/124314
Paramagnetic spherical nanoparticles by the self-assembly of persistent trityl radicals
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Spherical nanoparticles and fibres observable by cryo-electron microscopy are spontaneously formed by the Finland trityl radical at concentrations above 15 mM. These species represent a new class of paramagnetic, metal-free, nanoscale supramolecular materials. Self-association was observed under a variety of experimental conditions, including aqueous solution at room temperature, low temperature frozen glasses and the gas phase. Oligomers formed by at least 5 Finland radicals were detected by ion-mobility mass spectrometry. Magnetic susceptibility data as well as low temperature EPR spectra show coupling between electronic spins in the self-assembled species. Quantum chemical calculations show stacking along the C3 symmetry axis. Nanoparticle formation requires additional lateral packing that can be provided by bydrogen bonding involving the triangular array of carboxylic acid groups leading to the assembly of geodesic spheres.
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MARÍN MONTESINOS, Ildefonso, et al. Paramagnetic spherical nanoparticles by the self-assembly of persistent trityl radicals. Physical Chemistry Chemical Physics. 2016. Vol. 18, num. 4, pags. 3151-3158. ISSN 1463-9076. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/124314