ENERGETICS OF FORMATION OF SOME OXYGENATED IONS AND THE PROTON AFFINITIES OF CARBONYL COMPOUNDS

Abstract

The energetics and mechanism of formation of ions of m/e 31, 45, and 59 from a number of alcohols, ethers, and esters have been studied. The following ionic heats of formation have been obtained: CH2=OH+, 176 kcal/mole; CH3O+, 213 kcal/mole; CH3CH=OH+, 145 kcal/mole; CH2=OCH3+, 170 kcal/mole; (CH3)2C=OH+, 125 kcal/mole; CH3CH2CH=OH+, 131 kcal/mole; CH3CH=OCH3+, 135 kcal/mole; CH2=OC2H5+, 144 kcal/mole. It is concluded that with the exception of CH3O+ the alkoxy ions probably are not formed by electron impact processes. The gas-phase proton affinities of a number of carbonyl compounds are estimated.