Abstract
Infrared reflection absorption (IRA) spectroscopy was applied to study the adsorption process and structural change of (methacryloyloxy)alkyl dihydrogen phosphates, M10P and M2P (see Figure 1), during their self-assembling process at a silver substrate from a methyl methacrylate solution (5 × 10-5 mol/L). The saturation coverage of M10P was completed after about 50 min, while that of M2P was completed after about 25 min. The self-assembled monolayers of both M10P and M2P gave the νs(PO32-) band around 980 cm-1, indicating that the dissociation of the dihydrogen phosphate groups takes place on adsorption to the silver substrate. At an initial stage of the self-assembling process of M10P the IRA spectra gave only the νs(PO32-) band. After several minutes of incubation there arose the νas(PO32-) band near 1080 cm-1 and the intensity ratio of νas(PO32-)/νs(PO32-) increased with time, indicating that the axis of the PO32- group of the adsorbate changes from a perpendicular orientation to a tilted one. On the o...
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