Molecular modeling study of para amino benzoic acids recognition by β-cyclodextrin

Abstract

AM1 and PM3 methods were applied to investigate equilibrium geometries of inclusion complexes formed between 3-CD and neutral, anionic and cationic species of PABA (Para amino benzoic acid). 3-CD can bind to these three species (two possible orientations A or B) with negative binding energy, where the preference between A and Borientation of each PABA species is due to H-bond interaction. Finally, the HOMO and LUMO energies of each complex were calculated and compared.

Keywords

• PABA
• cyclodextrin
• inclusion complex
• PM3
• AM1
• B3LYP/6-31G*