Fig. 1. Nanoelectrospray ionization mass spectra obtained from 10 mM aqueous solutions of K4Fe(CN)6 with instrumental conditions tuned for small (black) and large clusters (green). Magic number clusters for Fe(CN)6 4–(H2O)n are observed at n = 46 and 64. Bare species with no hydrates include Fe(CN)4 2– (†) and Fe(CN)3 – (‡).
