INTERCALATION OF N-ALKYLAMINES BY GAMMA-TITANIUM PHOSPHATE - SYNTHESIS OF NEW MATERIALS BY THERMAL-TREATMENT OF THE INTERCALATION COMPOUNDS

The mechanism of intercalation reactions between n-alkylamines and gam ma-titanium phosphate has been investigated. The composition of these intercalates reveals that only 66 % of the P-OH groups present in the material may interact with amine groups of the guest molecules. The co mpounds with the maximum intercalation have the formula gamma-TiH0.7(P O4)2.1.3CnH2n+1NH3.H2O (n = 1-6). Well-defined crystalline phases with lower amine content are also isolated; their general formula is gamma -TiH2-y(PO4)2.YCnH2n+1NH3.mH2O (n = 1-6; y = 0.7, 1.0; m = 0.5, 1.0, 1 .5). New materials of the gamma-TiH2-y(PO4)2.yCnH2n+1NH3 (n = 1-6; y = 0.3,0.7,1.0,1.3) formula were synthesized by thermal decomposition of the intercalation compounds gamma-TiH0.7(PO4)2.1.3CnH2n+1-NH3.H2O(n = 1-6). Different routes of reactions are proposed for the intercalatio n and thermal decomposition processes. When y = 0.7, 1.0, 1.3 the n-al kylamines form a bimolecular film. When y = 0.3 the n-alkylamines form a monomolecular film. The inclination angle and the packing density i n the interlayer space of the n-alkylamines were determined. The resul ts are discussed as a function of the gamma-titanium phosphate structu re. The interest of these materials as molecular sieves and precursors in pillaring reactions is pointed out.