An intercalation compound of graphite probably containing potassium cryptate ions

Abstract

Potassium ions in KC₃₆ can react with the 3-dimensional cryptand ‘K222’(4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane) to yield a first-stage intercalation compound with an interlayer spacing d_i= 15.5 Å in which the K⁺ ions are probably within the macroheterobicyclic cage.