Abstract
B3LYP, B3LYP-D3 and MP2 calculations are used to predict the preferred site of binding of HCl to temozolomide (TMZ). Binding energies, bond length perturbations, and infrared spectra of the various heterodimers indicate that the O-atom of the terminal amide group is the preferred attack site. The interaction is strong with binding energy of roughly 30 kJ mol−1. The molecular electrostatic potential surrounding TMZ is consistent with this preference, but is unable to fully account for the energetic ordering of the other minima.
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