Fig. 2: Images of cluster separation.
a Ammonia solution of K12Si17 and 2.2.2-cryptand after storage at −40 °C for 12 h; b K1-x[K(2.2.2-crypt)]2+x[Si9] (x = 0.2) obtained from the filtrate after solvent removal; c Highly reactive filtration residue after solvent removal.
