Gas-phase rate coefficients for the reactions of O(3P), S( 3P), Se(3P), and Te(3P) with alkenes: Application of perturbation frontier molecular orbital theory, correlations, and Structure-Activity Relations (SARs)

Abstract

The kinetics of the reactions of the atoms O(3P), S( 3P), Se(3), and Te(3P) with a series of alkenes are examined for correlations relating the logarithms of the rate coefficients to the energies of the highest occupied molecular orbitals (HOMOs) of the alkenes. These correlations may be employed to predict rate coefficients from the calculated HOMO energy of any other alkene of interest. The rate coefficients obtained from the correlations were used to formulate structure-activity relations (SARs) for reactions of O(3P), S( 3P), Se(3P), and Te(3P) with alkenes. A comparison of the values predicted by both the correlations and the SARs with experimental data where they exist allowed us to assess the reliability of our method. We demonstrate the applicability of perturbation frontier molecular orbital theory to gas-phase reactions of these atoms with alkenes. The correlations are apparently not applicable to reactions of C(3P), Si(3P), N(4S), and Al(2P) atoms with alkenes, a conclusion that could be explained in terms of a different mechanism for reaction or these atoms. © wiley Periodicals, Inc.