Intercalation of α,ω-alkanediamines in layered aluminium dihydrogen triphosphate dihydrate

Intercalation of alpha,omega-alkanediamines, NH2(CH2)(n)NH2 (n = 3-10), into layered aluminium dihydrogen triphosphate dihydrate, AlH2P3O10. 2H(2)O, was investigated by XRD, DTA-TG, elemental analysis, and solid-state P-31, C-13 and Al-27 NMR. alpha,omega-Alkanediamines are intercalated to form a monomolecular layer in the interlayer region, in which the alkanediamines incline at 57 +/- 5 degrees to the phosphate layers, whereas n-alkylamines form a bilayer structure with the same inclination angle. Two amino groups in an alpha,omega-alkanediamine molecule bridge the layered sheets of phosphates.