Permethylated β-cyclodextrin/pesticide complexes: X-ray structures and thermogravimetric assessment of kinetic parameters for complex dissociation

摘要: The X-ray crystal structures of the inclusion complexes formed between three pesticides (two organophosphorus insecticides and one chloroacetanilide herbicide) permethylated β-cyclodextrin (TRIMEB) are reported. TRIMEB–fenitrothion (1), TRIMEB–fenthion (2) TRIMEB–acetochlor (3) members a commonly occurring isostructural series. mode two organophosphate is very similar, while acetochlor molecule, which structurally quite distinct from insecticide molecules, adopts somewhat different position within TRIMEB cavity. In addition to structural elucidation these complexes, their thermal behaviour was investigated using isothermal non-isothermal thermogravimetry. results showed that dissociation guest molecules cavities can best be described by mechanisms, namely first-order reaction model three-dimensional diffusion model. Both methods allowed determination activation energies loss process for each complex.