IR and Raman spectra of two layered aluminium phosphates Co(en) 3Al 3P 4O 16 · 3H 2O and [NH 4] 3[Co(NH 3) 6] 3[Al 2(PO 4) 4] 2 · 2H 2O

Abstract

The FT IR and FT Raman spectra of Co(en) 3Al 3P 4O 16 · 3H 2O (compound I) and [NH 4] 3[Co(NH 3) 6] 3[Al 2(PO 4) 4] 2 · 2H 2O (compound II) are recorded and analysed based on the vibrations of Co(en) 3 3+, Co(NH 3) 6 3+, NH 4 +, AlOP, PO 3, PO 2 and H 2O. The observed splitting of bands indicate that the site symmetry and correlation field effects are appreciable in both the compounds. In compound I, the overtone of CH 2 deformation Fermi resonates with its symmetric stretching vibration. The NH 4 ion in compound II is not free to rotate in the crystalline lattice. Hydrogen bonding of different groups is also discussed.