Abstract
IR and Raman studies and normal coordinate treatment of the complexes with strong, close to quasi-symmetrical H-bonds, formed by pyridine and related molecules with acids, have been carried out to elucidate the origin of Evans holes in IR spectra. It has been found that the holes appear near frequencies of those pyridine ring modes that involve the internal ring coordinates coupled kinematically with the proton stretching coordinate. When the H-bonding is so strong that the νXH frequency becomes close to the frequency of such a ring mode, resonance repulsion of frequencies arise, causing the formation of the hole.
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