Molecular modeling studies of the intramolecular twist mechanisms of racemization for tris chelate complexes |
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Authors: | Craig D Montgomery Carolyn J Shorrock |
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Institution: | Department of Chemistry, Trinity Western University, Langley BC, Canada V2Y 1Y1 |
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Abstract: | The preferred mechanisms of racemization for three tris chelate complexes, Co(acac)3, Fe(phen)3 3+ and FeS2CN(CH2)4]3, were investigated by molecular modeling. The transition states for both a Bailar twist and a Rây-Dutt twist were considered; semi-empirical calculations (PM3) yielded activation energies. The preferred mechanism was the Bailar twist for Co(acac)3 and FeS2CN(CH2)4]3 with activation energies of 83.2 and 7.3 kcal mol−1, respectively, and the Rây-Dutt twist for Fe(phen)3 3+ with an activation energy of 114.4 kcal mol−1. These results are compared with those of geometrical models. |
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Keywords: | Molecular modeling Semi-empirical calculations Racemization Mechanisms Metal complexes |
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