Adsorption of nitromethane on oxide surfaces was monitored using 13 C CP/MAS NMR. Stabilization of the aci-anion formed by reaction of nitromethane on acid−base pairs was apparent. A linear relationship between the 13 C NMR isotropic chemical shift of the methylene group of the adsorbed aci-anion of nitromethane and the heat of adsorption of CO 2 measured by microcalorimetry was established. The results suggest that nitromethane constitutes an accurate and effective NMR probe for monitoring the basicity of oxide surfaces.
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Lima et al. (2003) studied this question.