IR and Raman spectra of two layered aluminium phosphates Co(en)(3)Al(3)P(4)O16 center dot 3H(2)O and [NH4](3)[Co(NH3)(6)](3)[Al-2(PO4)(4)]center dot 2H(2)O

The FT IR and FT Raman spectra of Co(en)(3)Al3P4O16 . 3H(2)O (compound I) a nd [NH4](3)[Co(NH3)(6)](3)[Al-2 (PO4)(4)](2) . 2H(2)O (compound II) are rec orded and analysed based on the vibrations of Co(en)(3)(3+), Co(NH3)(6)(3+) , NH4+, Al-O-P, PO3, PO2 and H2O. The observed splitting of bands indicate that the site symmetry and correlation field effects are appreciable in bot h the compounds. In compound I, the overtone of CH2 deformation Fermi reson ates with its symmetric stretching vibration. The NH4 ion in compound II is not free to rotate in the crystalline lattice. Hydrogen bonding of differe nt groups is also discussed. (C) 2000 Elsevier Science B.V. All rights rese rved.