Hydrogen bonds of extremely high polarisability between molecules adsorbed on silica gel — an IR investigation

摘要: Abstract The adsorption on silica gel of a series electron pair donors with variation the pKa value from 12 up to range negative values was subjected IR spectroscopic investigation. Adsorption is effected via hydrogen bonds OH groups surface, indicated by disappearance band free (3750 cm −1 ) and occurrence broad at smaller wave numbers. shift roughly proportional value. Furthermore, continuous absorption observed as increases. This shows that protons become detached SiOH type NH + …N form between adsorbed molecules. A double minimum potential well occurs in these bonds, which are extremely easily polarisable. anomalous proton conductivity be expected sometimes presence such groupings discussed.