CONCENTRATION-DEPENDENCE IN NMR-SPECTRA AND STUDY OF INCOMMENSURABILITY, PHASE-TRANSITIONS AND MOLECULAR-DYNAMICS IN GRAPHITE-INTERCALATIONCOMPOUNDS AND ZEOLITES

A distinct fine structure in the NMR spectra of fluorinated graphite i ntercalation compounds is obtained due to the selective motional avera ging of the 'undesirable' intermolecular dipole-dipole interactions. T hrough analysis of these spectra, the arrangement of the guest molecul es has been obtained. A decrease of the activation energy of diffusion with increased molecular concentration has been observed in a stage 1 sample of fluorinated graphite (C2F)(n) intercalated with acetone. Th ese results are discussed along with similar results for Li diffusion in LixNbSe3 and LixTiS2 from the literature; we propose that such beha vior is caused by the formation of a guest sublattice which is incomme nsurate with the host lattice. Unusual temperature and concentration d ependences of the H-1, (203)T1 and (205)T1 spectra in narrow-pore T1-n atrolite show that the set of positions occupied by water molecules an d T1(+) ions changes continuously with the temperature. In this case, the water and T1 sublattice may be incommensurate with the aluminosili cate framework.