title: Study of inclusion complex of β-cyclodextrin and diphenylamine: photophysical and electrochemical behaviors.
abstract: The photophysical, electrochemical and photoprototropic behaviors of diphenylamine (DPA) in aqueous β-cyclodextrin (β-CD) solution have been investigated using absorption spectroscopy and cyclic voltammetric techniques. Absorption of the neutral and cationic form of DPA is enhanced due to the formation of a 1:1 complex with β-CD. The formation of this complex has been confirmed by Benesi-Hildebrand plot and docking studies by RasMol tool methods. The solid complex of β-CD with DPA is investigated by FT-IR, XRD and AFM methods. The thermodynamic parameters (ΔG, ΔH and ΔS) of inclusion process are also determined. The pK(a) values of neutral-monocation equilibria have been determined with absorption (conjugate acid-base) titrations. A mechanism is proposed to explain the inclusion process.
authors: Department of Industrial Chemistry, Alagappa University, Karaikudi, Tamilnadu, India.
authors: K
authors: K
authors: Srinivasan
authors: K
authors: K
authors: Kayalvizhi
authors: K
authors: K
authors: Sivakumar
authors: T
authors: T
authors: Stalin
mesh_terms: D000042:Absorption / Q000528:radiation effects; D004159:Diphenylamine / Q000737:chemistry*; D004560:Electricity; D055664:Electrochemical Techniques; D004566:Electrodes; D006863:Hydrogen-Ion Concentration / Q000528:radiation effects; D008027:Light; D018625:Microscopy, Atomic Force; D008958:Models, Molecular; D055585:Physical Phenomena; D011208:Powders; D011522:Protons; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D011208:Powders; D011522:Protons; D012996:Solutions; D047392:beta-Cyclodextrins; D004159:Diphenylamine; C031215:betadex