Abstract
Reactions of C 2H + 2 with a series of molecules having different proton affinities were studied on a selected ion flow tube (SIFT) in order to bracket the proton affinity of the C 2H radical. Reactions with XCN (X = Cl, Br) were particularly relevant and yielded PA (C 2H ) = 175 ± 1 kcal mol −1 at 298 K. A thermochemical cycle leads to the bond energy D 0 (C 2HH) = 123 ± 1 kcal mol −1. Since the proton transfer reactions were studied only in the forward direction, these values were obtained from correlations between the efficiency of proton transfer and the overall reaction thermochemistry. The observation of H atom transfer from C 2H 2 to NH + 3 verifies the rather low bond energy in acetylene.
Published Version
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More From: International Journal of Mass Spectrometry and Ion Processes
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