Tropospheric Chemistry Of Aromatic Compounds:
Evidence For A Rate-determining Addition Of NO3
And OH To Substituted Toluenes
Author(s)
E. Bolzacchini, M. Bruschi, J. Hjorth, S. Meinardi, M. Orlandi,
G. Restelli & B. Rindone
Abstract
Tropospheric chemistry of aromatic compounds:
Evidence for a rate-determining addition of NOg
and OH to substituted toluenes
E. Bolzacchini*, M. Bruschi*, J. Hjorth\ S. Meinardi\ M. Orlandi*,
G. Restelli*, B. Rindone*
^Dipartimento di Scienze dell'Ambiente e del Territorio, Universita'
di Milano, Via Emanueli, 15, 1-20126 Milano, Italy, e-mail:
rindone@alpha.disat.unimi.it; ^Commission of the European
Communities, Joint Research Centre, Environment Institute,
21020 Ispra (VA), Italy, e-mail: jens.hjorth@jrc.it.
Abstract
The OH- and the NOs-initiated oxidation of aromatic hydrocarbons are major
sinks for these species, observed in high concentrations in urban areas. This
demands a better knowledge of mechanisms and reaction products. The plot of
log k (six compounds) for para-substituted toluenes vs Hammett's p for the
reaction with OH has a p = - 2.3 ± 0.2; r% = 0.96. This is in line with the known
rate-determining addition of OH involving a polar transition state.
Keywords
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