The structure and electron properties of Na$_n$C$_6$$_0$ (n = 2, 3) sodium fullerides synthesized from simple compounds in toluene were studied. It was shown that Na$_2$C$_6$$_0$ fulleride forms a face-centered cubic lattice at temperatures above 300 K. As the temperature is lowered, the phase transition to a structure with a simple cubic lattice takes place. The temperature dependences of the properties of Na$_3$C$_6$$_0$ with a more complex structure exhibit features that are presumably due to sodium atom redistribution in the Na$_3$C$_6$$_0$ fulleride lattice and the formation of sodium ion clusters.
76.30.Pk Conduction electrons
76.60.-k Nuclear magnetic resonance and relaxation
78.30.Na Fullerenes and related materials
$^1$Department of Low-Temperature Physics and Superconductivity, Faculty of Physics, Moscow State University, Moscow, 119991, Russia
$^2$Faculty of Chemistry, Moscow State University, Moscow, 119998, Russia
$^3$Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia