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Endothermic proton transfer reactions from three [C 6 H 6 ] + ˙ isomers
Author(s) -
Kinter Michael T.,
Bursey Maurice M.
Publication year - 1987
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210221204
Subject(s) - proton , chemistry , proton affinity , endothermic process , exothermic reaction , radical , ion , benzene , triple quadrupole mass spectrometer , quadrupole , mass spectrometry , kinetic energy , affinities , analytical chemistry (journal) , photochemistry , stereochemistry , atomic physics , organic chemistry , nuclear physics , physics , tandem mass spectrometry , adsorption , protonation , chromatography , quantum mechanics , selected reaction monitoring
A triple quadrupole mass spectrometer was used to establish the proton affinities of phenyl, CH 3 CCCCCH 3 and HCCCH 2 CCCH radicals as 870±29, 824±25, and 757±21 kJmol −1 , respectively, from the kinetic energy of benzene, 2,4‐hexadiyne, and 1.5‐hexadiyne molecular ions at which the onset of proton transfer to less basic species occurs in the second rod assembly. These values were confirmed by other triple quadrupole experiments involving bracketing of exothermic proton transfers.