Multifunctional organic stable radicals in supramolecular high-spin architectures and materials

This work is supported by a Grant of the Romanian National Authority for Scientific Research, CNCS - UEFISCDI.

Project Summary

    New multifunctional organic stable free (poly)radicals of different types will be obtained and used as building blocks for supramolecular architectures and materials with high-spin properties. The synthesis of such radicals (organic spins) will be conducted in a way to achieve in the same molecule tailored moieties that can be involved in supramolecular bonds (H-bonds, pi-stacking, donor-acceptor, charge-transfer, etc.). Thus, the new compounds may contain aromatic-, polynitro-, urea-, amino-, carboxyl-, or macrocyclic crown ether moieties, which are well known to form supramolecular architectures. These multifunctional (poly)radicals will be used to build supramolecular assemblies through non-covalent bonds, resulting supramolecular systems that can act as high-spin materials, due to co-operative spin-spin interactions. Cucurbiturils, a category of macrocyclic compounds containing urea moieties, will be used to control the size and stability of the supramolecular architectures, tuning the spin-spin interactions. Different types of nanoparticles labelled with organic spins will be also obtained and involved in supramolecular architectures. Classical organic chemistry and analytical measurements will be used for the design and full characterization of the new compounds, as well for their supramolecular assemblies; (para)magnetic measurements will provide information about spin distribution, inter-spin distance and exchange, and magnetic behaviour.

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