INTERCALATION OF A TRIETHYLENETETRAMINE-SUBSTITUTED CYCLODEXTRIN BY CO(II)-MONTMORILLONITES AND NI(II)-MONTMORILLONITES

The intercalation of mono[6-[(8-amino-3,6-diazaoctyl)amino]-6-deoxy]-beta-cyclodextrin (CDtrien) by Co(II)- and Ni(II)-montmorillonites was examined at 25-degrees-C. At low uptakes, the CDtrien molecules in both minerals form a monolayer, 13-14 angstrom thick, with their cavity axes perpendicular to the silicate layers. At higher loadings, guest molecules with the same orientation form a bilayer in Co-(21.8 angstrom thick) and Ni-montmorillonites (17.6 angstrom). Their thicknesses are larger than those for the Cu-and Zn-analogues, 16.1 angstrom, i.e. twice the molecular thickness.