Absorption bands (cm-1) and their peak assignments Transition metal (Fe or Ni) 12 hydroxyl oleate 1711 -C=O stretching 2723 -C-H out of plane bend 2922 C-H stretching 1432 -C=C stretching 1377 -CH3 symmetric deformation 1592 Asymmetric vibration carboxyl group coordinated to the metal 3350 O-Hstretching vibration

Table 2: Characteristic peak values in FTIR spectra for transition metal 12 hydroxyl oleate (Fe or Ni 12 hydroxyl oleate).