Sp. Gabuda et Sg. Kozlova, ANOMALOUS MOBILITY OF MOLECULES, STRUCTURE OF THE GUEST SUBLATTICE, AND TRANSFORMATION OF TETRANATROLITE TO PARANATROLITE, Journal of structural chemistry, 38(4), 1997, pp. 562-569
The structure of the guest sublattice in the structural channels of na
trolite zeolites oversaturated with water (also, at high pressures) is
established. It was found from H-1 NMR spectra that reduction of symm
etry and sharply increased mobility of water molecules in paranatrolit
e and in the high-pressure phase of orthorhombic natrolite follow the
same mechanism - half of positions in the structural channels are occu
pied by ordered water molecules. The other positions are vacant and ma
y be involved in the mechanism of fast diffusion of water molecules.