The delamination and intercalation of a layered microporous aluminophosphate, [Al3P4O16](3-.)3[CH3(CH2)NH3](+) (AlP). with aromatic amine have been carried Out and were followed by XRD and SEM measurements. The basicity of the amine plays all important role in this process. as do the dielectric constant of the solution and the amount of airline added. A saturated benzylamine (pK(a) of 9.34) intercalate of the aluminophosphate are obtained in solutions with dielectric constant of 50-70 and all amine concentration of 10 mmol/g AlP, while no aniline (pK(a) of 4.60) intercalates are formed Under similar conditions. The remarkable effect of basicity of the airline call be explained by a metathetical balanced reaction model, which was proved by the results of the intercalation processes of 4-methylpiridine (PKa = 6.00) and 4-methylimidazole (pK(a) = 7.55). (c) 2004 Elsevier Inc. All rights reserved.