Abstract
Physiadsorbates and chemiadsorbates of p-hydroxybenzoic acid methylester (pHBAME) on colloidal and porous silicas were studied by IR and UV spectroscopy. In the IR spectra of self-supporting discs of the adsorbates, typical features were detected which allow differentiation between the physi- and the chemiadsorbed state: a strong absorption band at 1417 cm−1 characterizes the chemiabsorbate. Dehydration by annealing and rehydration of the adsorbates proceeded also in a different way, indicated by absorption bands both in the carbonyl group and in the ring vibration frequency range. In the UV spectra the absorption maximum of the chemiadsorbate occured at 250 nm and that of the physiadsorbate at 255.5 nm (from cyclohexane suspensions of the adsorbates).
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