Pulse radiolysis studies of aminobenzenesulfonates: Formation of cation radicals. [7 MeV electrons]

Journal Article · Thu Sep 19 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100172a078· OSTI ID:5259171

Behar, D; Behar, B ^[1]

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1. Univ. of Notre Dame, IN (United States)

Sulfanilic acid and anilinedisulfonic acids (ADS) react with OH radicals (k = 8.2 {times} 10{sup 9} and 5.9 {times} 10{sup 9} M{sup {minus}1}s{sup {minus}1}) to form the corresponding OH adducts. In acid solutions the adducts react with protons to yield cation radicals (k = 5.3 {times} 10{sup 8} and 8.7 {times} 10{sup 8} M{sup {minus}1}s{sup {minus}1}). N{sub 3} oxidizes sulfanilic acid directly to the cation radical by an electron-transfer reaction at a diffusion-controlled rate constant, k = 6.5 {times} 10{sup 9}M{sup {minus}1}s{sup {minus}1}, while the rate of oxidation of ADS by N{sub 3} is only 7.6 {times} 10{sup 7} M{sup {minus}1}s{sup {minus}1}. SO{sub 4}{sup {minus}} on the other hand oxidizes ADS to the cation radical at a rate of 1.8 {times} 10{sup 9}M{sup {minus}1}s{sup {minus}1}. Both cation radicals deprotonate to the anilino-type radicals in acid-base equilibria. The pK{sub a} of deprotonation of the sulfanilic cation radical is 5.8 {plus minus} 0.05 and that of the ADS cation radical is 4.3 {plus minus} 0.05.

• OSTI ID: 5259171
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:19; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
AMINES
AROMATICS
AZIDES
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON TRANSFER
ELECTRONS
ELEMENTARY PARTICLES
EQUILIBRIUM
FERMIONS
HYDROXYL RADICALS
IONS
KINETICS
LEPTONS
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDATION
PH VALUE
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
SOLVATED ELECTRONS
SPECTRA
SPECTROSCOPY
SULFANILIC ACID
SULFONIC ACIDS
THERMODYNAMICS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA