A room-temperature study of the kinetics of protonation of formaldehyde

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Abstract
Rate constants measured with the flowing afterglow technique at 297 ± 2 K are reported for the protonation of CH2O by H3+, N2H+, CH5+, HCO+, C2H5+, H3O+, H3S+, and HCNH+ and for the subsequent deprotonation by NH3. The rate constants are compared with predictions of various theories for ion–molecule collisions. The protonation was observed to proceed in the absence of competing channels and further decomposition and is discussed in terms of the energetics of the two sites of protonation and the energetics and mechanism of H2 elimination. The rate measurements provide evidence for the room-temperature conversion of the adduct C2H3+•H2 to the more stable isomer derived from the direct protonation of C2H4.

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