Comparison of experimental and theoretical structures of a transition state analogue used for the induction of anti-cocaine catalytic antibodies
ACS Citation
Sherer, E. C.; Yang, G.; Turner, G. M.; Shields, G. C.; Landry, D. W. Comparison of Experimental and Theoretical Structures of a Transition State Analogue Used for the Induction of Anti-Cocaine Catalytic Antibodies. J. Phys. Chem. A 1997, 101 (45), 8526-8529.
Version of Record
Abstract
Comparison of the crystal structure of a transition state analogue that was used to raise catalytic antibodies for the benzoyl ester hydrolysis of cocaine with structures calculated by ab initio, semiempirical, and solvation semiempirical methods reveals that modeling of solvation is crucial for replicating the crystal structure geometry. Both SM3 and SM2 calculations, starting from the crystal structure TSA I, converged on structures similar to the crystal structure. The 3-21G({\{}*{\}})/HF, 6-31G{\{}*{\}}/HF, PM3, and AM1 calculations converged on structures similar to each other, but these gas-phase structures were significantly extended relative to the condensed phase structures. Two transition states for the hydrolysis of the benzoyl ester of cocaine were located with the SM3 method. The gas phase calculations failed to locate reasonable transition state structures for this reaction. These results imply that accurate modeling of the potential energy surfaces for the hydrolysis of cocaine requires solvation methods.
Source Name
Journal of Physical Chemistry A
Publication Date
1997
Volume
101
Issue
45
Page(s)
8526-8529
Document Type
Citation
Citation Type
Article