Ab initio calculations of the transition-state geometry and vibrational frequencies of the SN2 reaction of chloride with chloromethane

1989 ◽  
Vol 93 (25) ◽  
pp. 8138-8142 ◽  
Author(s):  
Susan C. Tucker ◽  
Donald G. Truhlar
Keyword(s):  
Transition State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Vibrational Frequencies ◽  
Sn2 Reaction ◽  
Transition State Geometry

Ab Initio Calculations for Hydrocarbons:  Enthalpy of Formation, Transition State Geometry, and Activation Energy for Radical Reactions

2003 ◽  
Vol 107 (43) ◽  
pp. 9147-9159 ◽  
Author(s):  
Mark Saeys ◽  
Marie-Françoise Reyniers ◽  
Guy B. Marin ◽  
Veronique Van Speybroeck ◽  
Michel Waroquier
Keyword(s):  
Activation Energy ◽  
Transition State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Enthalpy Of Formation ◽  
Radical Reactions ◽  
Transition State Geometry

Nitro–Nitrite Isomerization and Transition State Switching in the Dissociation of Ionized Nitromethane: A Threshold Photoelectron–Photoion Coincidence Spectroscopy Study

2009 ◽  
Vol 15 (2) ◽  
pp. 157-166 ◽  
Author(s):  
Brandon Ferrier ◽  
Anne-Marie Boulanger ◽  
David M.P. Holland ◽  
David A. Shaw ◽  
Paul M. Mayer
Keyword(s):  
Transition State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Bond Cleavage ◽  
Cleavage Reaction ◽  
Nitrite Ion ◽  
Methyl Nitrite ◽  
Bond Cleavage Reaction ◽  
Entropy Of Activation ◽  
Lower Entropy

Threshold photoelectron–photoion coincidence (TPEPICO) spectroscopy has been employed to investigate the competition between bond cleavage and rearrangement reactions in the dissociation of ionized nitromethane, 1. Modeling TPEPICO breakdown diagrams with a combination of RRKM theory and ab initio calculations at the G3 level of theory allowed the derivation of the activation energy for the isomerisation of 1 to ionized methyl nitrite, 2, 82 kJ mol−1. In addition, evidence was found for a transition state switch in the bond cleavage reaction in 1 leading to CH3• + NO2+. As internal energy increases, the effective transition state for this reaction becomes tighter (i.e. is characterized by a lower entropy of activation, Δ‡S). Fitted thresholds for NO+ and CH2OHO+ ions, originating from the isomeric methyl nitrite ion, are consistent with G3 level ab initio calculations.

The structure of nitrobenzene and the interpretation of the vibrational frequencies of the CNO2 moiety on the basis of ab initio calculations

1994 ◽  
Vol 326 ◽  
pp. 1-16 ◽  
Author(s):  
Vladimir A. Shlyapochnikov ◽  
Leonid S. Khaikin ◽  
Olga E. Grikina ◽  
Charles W. Bock ◽  
Lev V. Vilkov
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Vibrational Frequencies

Molecular structure and vibrational frequencies of AlxOy (x=1,2; y⩽3) derived from ab initio calculations

1988 ◽  
Vol 144 (4) ◽  
pp. 373-377 ◽  
Author(s):  
J. Masip ◽  
A. Clotet ◽  
J.M. Ricart ◽  
F. Illas ◽  
J. Rubio
Keyword(s):  
Molecular Structure ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Vibrational Frequencies
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