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.