Abstract
13C NMR investigations were carried out at 4.5 K in order to analyze the lineshape of the solid-state spectrum of 13CO adsorbed on Brønsted acid sites in H Y zeolites. The spectrum was found to be dominated by the chemical shift anisotropy and by the heteronuclear magnetic dipolar interaction between the 13C nucleus of the 13CO molecule and the proton of the Brønsted acid site where the molecule is adsorbed. Therefore, an analysis of the lineshape of the low-temperature 13C NMR spectrum allows a precise determination of the hydrogen bond distance r H C between these nuclei. A value of r H C =0.21±0.01 nm has been obtained by this method which is in excellent agreement with recent quantum chemical calculations.
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