Kalium, rubidium, dan sesium bereaksi dengan grafit; atom-atom mereka terinterkalasi di antara lapisan-lapisan grafit heksagonal, membentuk senyawa interkalasi grafit dengan rumus kimia MC60 (berwarna abu-abu gelap, hampir hitam), MC48 (abu-abu gelap, hampir hitam), MC36 (biru), MC24 (biru baja), dan MC8 (perunggu) (M = K, Rb, or Cs).
Potassium, rubidium, and caesium react with graphite; their atoms are intercalated between the hexagonal graphite layers, forming graphite intercalation compounds of formulae MC60 (dark grey, almost black), MC48 (dark grey, almost black), MC36 (blue), MC24 (steel blue), and MC8 (bronze) (M = K, Rb, or Cs).WikiMatrix WikiMatrix