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Issue 2, 2006
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Kinetics and mechanism of the β-alanine + OH gas phase reaction: A quantum mechanical approach

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Abstract

The OH hydrogen abstraction reaction from β-alanine has been studied using the BHandHLYP hybrid HF–density functional and 6-311G(d,p) basis sets. The energies have been improved by single point calculations at the CCSD(T)/6-311G(d,p) level of theory. The structures of the different stationary points are discussed. Reaction profiles are modeled including the formation of pre-reactive and product complexes. Negative net activation energy is obtained for the overall reaction. A complex mechanism is proposed, and the rate coefficients are calculated using transition state theory over the temperature range of 250–400 K. The rate coefficients are proposed for the first time and it was found that in the gas phase the hydrogen abstraction occurs mainly from the CH2 group next to the amino end. The following expressions, in cm3 mol−1 s−1, are obtained for the overall rate constants, at 250–400 and 290–310 K, respectively: k250–400 = 2.36 × 10−12 exp(340/T), and k290–310 = 1.296 × 10−12 exp(743/T). The three parameter expression that best describes the studied reaction is k250–400 = 1.01 × 10−21T3.09 exp(1374/T). The β-alanine + OH reaction was found to be 1.5 times faster than the α-alanine + OH reaction.

Graphical abstract: Kinetics and mechanism of the β-alanine + OH gas phase reaction: A quantum mechanical approach

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Publication details

The article was received on 19 May 2005, accepted on 28 Sep 2005 and first published on 19 Oct 2005


Article type: Paper
DOI: 10.1039/B507101A
Citation: Phys. Chem. Chem. Phys., 2006,8, 285-292
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    Kinetics and mechanism of the β-alanine + OH gas phase reaction: A quantum mechanical approach

    A. Cruz-Torres, A. Galano and J. Raúl Alvarez-Idaboy, Phys. Chem. Chem. Phys., 2006, 8, 285
    DOI: 10.1039/B507101A

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