Intercalation of α,ω-Alkyldiamines into Layered α-Titanium Phosphate from Aqueous Solutions

This paper reports a study on the mechanism of intercalation of α,ω-alkyldiamines, NH2(CH2)nNH2 (n = 2–9), into layered α-titanium phosphate, α-Ti(HPO4)2·H2O. The intercalates synthesis was performed by titrating the host with aqueous solutions of alkyldiamine at 25%C. Crystalline phases showing a general formula α-Ti(HPO4)2·xNH2(CH2)nNH2·H2O (x ≤ 1) have been obtained. In every case, a monolayered arrangement of α,ω-alkyldiamine molecules into the host layers is formed. The average inclination angle of the alkyldiamine molecules to the phosphate layer and the intercalates packing density have been determined.