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Formation kinetics, mechanism, and thermodynamics of glyoxylic acid-sulfur(IV) adducts

Olson, Terese M. and Hoffmann, Michael R. (1988) Formation kinetics, mechanism, and thermodynamics of glyoxylic acid-sulfur(IV) adducts. Journal of Physical Chemistry, 92 (14). pp. 4246-4253. ISSN 0022-3654. doi:10.1021/j100325a050.

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A spectrophotometric study of the reversible addition of glyoxylic acid and S(IV) was conducted over the pH range of 0.7-2.9. Formation rates of the adduct, 2-hydroxy-2-sulfcethanoiacc id (HSEA), and its conjugate base were consistent with the following rate expression: -d[S(IV)]/dt = (k_1α_1β_1+ k_3α_2β_1)[C_2H_2O_3][S(IV)], where [C_2H_2O_3]= [CHOCO_2H]+ [CHOCO_2^-] + [CH(OH)_2CO_2H] + [CH(OH)_2CO_2^-], [S(IV)] = [H_2O•SO_2] + [HSO_3^-] + [SO_3^(2-)]ɑ_1 = [HSO_3^-]/[S(IV)], α_2 = [SO_3^(2-)]/[S(IV)], and β_1 = [CHOCO_2H]/[C_2H_2O_3]. The rate constants k_1 and k_3 correspond to the respective addition steps of HSO_3^- and SO_3^(2-) with CHOCO_2H. A study of the pH dependence gave k_1 = 443 (±21.2) M^(-1) s^(-1) and k_3 = 1.98 x 10^7 M^(-1) s^(-1). Temperature studies of the reaction showed that the ΔS^* for the addition of bisulfite and glyoxylic acid is significantly more negative than activation entropies for other low molecular weight aldehydes. A transition state was proposed that involves intramolecular hydrogen bonding. Adduct stability constants were determined as ^cK_1 = [HO_2CCH(OH)- SO_3^-]/([CHOCO_2H][HSO_3^-]) 7.09 X l0^7 M^(-1) and ^cK_2 = [^-O_2CCH(OH)SO_3^_]/([CHOCO_2^-][HSO_3^_]) = 5.27 x 10^6 M^(-1) at 25 ºC and µ = 0.2 M. Correlations of these and other α-hydroxyalkanesulfonate stability constants with the Taft σ^* parameter and with carbonyl hydration constants are presented. The acid dissociation constant for the HSEA carboxyl group was estimated by potentiometric titration to be p^cK_(a5) = 2.99. The importance of glyoxylic acid as a reservoir for S(IV) in atmospheric water droplets was evaluated on the basis of these thermodynamic constants.

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Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1988 American Chemical Society. Received: December 2, 1987. We thank Eric Betterton for his helpful advice, and we gratefully acknowledge the Electric Power Research Institute (RP1630-47), the Environmental Protection Agency (R811496-01-1), and the Public Health Service (ES04635-01) for their financial support.
Funding AgencyGrant Number
Electric Power Research Institute (EPRI)RP 1630-47
Environmental Protection Agency (EPA)R811496-01-1
U.S. Public Health Service (USPHS)ES04635-01
Issue or Number:14
Record Number:CaltechAUTHORS:20150814-140636633
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Official Citation:Formation kinetics, mechanism, and thermodynamics of glyoxylic acid-sulfur(IV) adducts Terese M. Olson and Michael R. Hoffmann The Journal of Physical Chemistry 1988 92 (14), 4246-4253 DOI: 10.1021/j100325a050
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59552
Deposited By: Ruth Sustaita
Deposited On:17 Aug 2015 17:38
Last Modified:10 Nov 2021 22:22

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