Infrared absorption spectra of 5-cyanopent-1-ene adsorbed on Y-type zeolites

Abstract

The i.r. absorption spectra of 5-cyanopent-1-ene on a decationated Y-zeolite and on a sodium-Y zeolite have been compared. It is shown that both functional groups at either end of the alkene-nitrile interact with the H-Y surface. From the absence of adsorption bands at 3080 and 1642 cm^–1 from the spectrum of the adsorbed molecule on H-Y it is concluded that adsorption is accompanied by loss of the alkene bond. New bands which appear at 2400 and 2900 cm^–1 with a shift of the 2250–2280 cm^–1ν(CN) vibration upon adsorption suggest some hydrogen-bonding interaction between the nitrile group and surface hydroxy-groups.

In the case of the sodium-Y surface, where zeolite surface hydroxy-groups are not observable in the 3500–3700 cm^–1 spectral region, the spectrum of adsorbed 5-cyanopent-1-ene strongly resembles the spectrum of the compound in the form of a neat film.