Superradiation and synthesis of metal nanoparticles in a polystyrene composite with Eu multi-spin complexes under fast uniaxial compression

Composites of heterospin molecular magnet [Eu$^{\mathrm{III}}$(SQ)$_3$bipy] in a polystyrene (PS) matrix have been synthesized. This complex [Eu$^{\mathrm{III}}$(SQ)$_3$bipy] contains four paramagnetic centers – the Eu$^{3+}$ ion and three SQ ligands (SQ-3,6-di-tert-butyl benzoquinone radical anion); bipy (bipyridyl) is diamagnetic. It has been established that intensive mechanical activation of [Eu$^{\mathrm{III}}$(SQ)$_3$bipy]/PS samples leads to an reological explosion, as a result of which radio frequency superradiance, the appearance of free electrons and the formation of Eu metal nanoparticles are observed. The duration of this process is 10 ns.