A Quantum Chemical and Classical Transition State Theory Explanation of Negative Activation Energies in OH Addition To Substituted Ethenes

2000 ◽  
Vol 122 (15) ◽  
pp. 3715-3720 ◽  
Author(s):  
J. Raúl Alvarez-Idaboy ◽  
Nelaine Mora-Diez ◽  
Annik Vivier-Bunge
Keyword(s):  
Transition State ◽  
Quantum Chemical ◽  
Transition State Theory ◽  
Activation Energies ◽  
State Theory ◽  
Classical Transition

On the Calculation of Transition State Activity Coefficient and Solvent Effects on Chemical Reactions

1998 ◽  
Vol 63 (12) ◽  
pp. 1969-1976 ◽  
Author(s):  
Alvaro Domínguez ◽  
Rafael Jimenez ◽  
Pilar López-Cornejo ◽  
Pilar Pérez ◽  
Francisco Sánchez
Keyword(s):  
Activity Coefficient ◽  
Transition State ◽  
Chemical Reactions ◽  
Solvent Effects ◽  
Transition State Theory ◽  
Reaction Medium ◽  
State Theory ◽  
Precursor Complex ◽  
State Activity ◽  
Classical Transition

Solvent effects, when the classical transition state theory (TST) holds, can be interpreted following the Brønsted equation. However, when calculating the activity coefficient of the transition state, γ# it is important to take into account that this coefficient is different from that of the precursor complex, γPC. The activity coefficient of the latter is, in fact, that calculated in classical treatments of salt and solvent effects. In this paper it is shown how the quotients γ#/γPC change when the reaction medium changes. Therefore, the conclusions taken on the basis of classical treatments may be erroneous.

A theoretical study of the addition of CH2OO to hydroxymethyl hydroperoxide and its implications on SO3 formation in the atmosphere

2020 ◽  
Vol 22 (25) ◽  
pp. 14130-14141
Author(s):  
Ronald Chow ◽  
Daniel K. W. Mok
Keyword(s):  
Transition State ◽  
Quantum Chemical ◽  
Transition State Theory ◽  
Theoretical Study ◽  
State Theory ◽  
Chemical Methods ◽  
Quantum Chemical Methods ◽  
Indirect Source

The reaction of hydroxymethyl hydroperoxide with the simplest Criegee intermediate has been examined using quantum chemical methods with transition state theory. Results suggested that the reaction could be an indirect source of H2SO4 in atmosphere.

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